Uiimage Name

toOpaque(), gifPropertiesPointer) == false { Now add gif image to your project and when you…. App Icon To set the app icon, simply select "App Icon" in the asset catalog and drag a. Image = UIImage. iOS - Objective-C | Scale Image Size to Fullscreen You may need to use the following imports (if needed, update your pod file accordingly) #import. We'll assume you already have an UIImageView, containing an image, named 'image' :. If you came across to a requirement where you want to make UIImage Background Transparent then use below method to achieve it. af_threadSafeImage(with:scale:) Initializes and returns the image object with the specified data and scale in a thread-safe manner. My temporary workaround is to statically load the images I need once. Thus, the UIImageView couldn't possibly know the filename. Now open your ViewController. Get it from here. I have created an UITableView in which I display thumbnails and image names. jpg image with UIImage. rb, lib/ios/sugarcube-568/uiimage. Concept of UIImage and UIImageView (container) UIImage - Bitmap with different formats Ex png and jpeg. In this case, use Data(contentsOf:options:) with a URL, which properly throws file system errors. Rating Bar In Xamarin iOS. Now we will add new file in our ios tableview applications for that go to the File à click on New à click on file button like as shown below. #FFFFFF or 100x100. iOS, Version=0. // Named const myImage = UIImage. Hi all, I'm trying to figure out how to get a screenshot (don't need to save it, just store it in a variable) within xCode (not within Unity). Hello there, In today's lesson we're going to focus on expanding the UIImage class so that we can create an image with a single solid color, let's say red or blue or green, directly from code. UIImageはUImageViewと一緒に使われることが多いです。 UIImageで取り込んだ画像を背景パターンとした例です。 画像サイズは844×562でプロジェクトに「Add Files to…」にて追加しました。 ViewController. Default color is lightGray. Save UIImage to photo library. Dynamic Image Creation for UI Customization By Mobile Jazz on April 8, 2014 - 4 Minutes iOS developers deeply know the huge value of working with a good graphic designer. These states changes to the different state as per user or system actions. Use a little—or a lot. While we upload an image to server it doesn't matter what is size of image but sometimes it matters pixel rate of image, here we need to reduce the pixel rate. How to convert a UIImage to Black and White? Please do follow this post along with the post here //this button click even twill call the convertToBlackNWhite() method to sart the color conversion to black and white. systemName('multiply. h: We defined a new method, resizedImageWithSize:, which is now available to all of your UIImage objects - you only need to #import "UIImage+Resizing. So for example, if I have an image named "Bob" set to the UIImage with the file name "BobsPicture. Note that, although being a "Get" function, the returned image actually has retain count of +1, and the caller (you) are responsible to CGImageRelease it. name」を確実に記憶に残す 「image. Select your app from the TARGETS section, then select the Info tab, and expand the URL Types section. i have installed through pods , integration is successful as per message in terminal. Loads an image relative to the application bundle, and caches its result. Some possibilities: [code]var imageA1: UIImage? = nil var imageA2: UIImage! var imageA3: UIImage = UIImage() var imageA4: UIImage? = UIImage() var imageA5: UIImage. It also provides disk caching and makes networking easier. So for example, if I have an image named "Bob" set to the UIImage with the file name "BobsPicture. Don't use UIImage(contentsOfFile:) either, because it's a path-based API. React Native combines the best parts of native development with React, a best-in-class JavaScript library for building user interfaces. Changed a function name to conform to the Apple standard. So I have coded these codes, for only printing a message when an image is selected. 1) Unknown type name in UIImage File name: - FKDataTypes. It works, but very slowly. name」を確実に記憶に残す 「image. HelveticaNeue-Regular' ) appended with their weight. After you pick an image with the UIImagePickerController, how do you retrieve the image name and path??? Thanks! This site uses cookies for analytics, personalized content and ads. SwiftでUIImageのimageNamed:でファイルが存在しなかったときに起こる謎 このQiita様のサイトをでUIImageがnilを保有しても落ちない件に関して実際にコードを触ってみました。. For those who don’t like playgrounds, you can also create a new single view application. jpg", I might add him to the dictionary like this: imageCache["Bob"] = UIImage(named: "BobsPicture. Note that, although being a "Get" function, the returned image actually has retain count of +1, and the caller (you) are responsible to CGImageRelease it. Mainly because to convert the Texture2D (from the RenderTexture) to the UIImage, then to add to the video frame, I encode the texture in PNG, get the bytes and call the native objective-C, which creates the UIImage. class and the iPhoneÕs own UIImage class. UIImageView: It's something like frame of the image or placeholder of the image where we'll set our UIImage or image. The big issue of course is that UIImage:named: takes a hard-coded string, and returns an optional UIImage. init?(system Name: String, with Configuration: UIImage. jpg", I might add him to the dictionary like this: imageCache["Bob"] = UIImage(named: "BobsPicture. [GamaSutra] Blog: SpriteRenderer vs. Don't use UIImage(contentsOfFile:) either, because it's a path-based API. Image processing on mobiles can be pretty performance intensive given the relatively low power of their CPU's (as compared to desktops). Attached is a sample project used to get the following performance numbers:. Dynamic Image Creation for UI Customization By Mobile Jazz on April 8, 2014 - 4 Minutes iOS developers deeply know the huge value of working with a good graphic designer. com account. More interestingly, a CIContext is used here to create a UIImage (by way of a CGImage Ref intermediary representation), since UIImage(CIImage:) doesn’t often work as expected. - To define UIImage, in swift made more easy task, Just pass the imageName in mehtod and you are ready - But make sure that, the image name which you are passing is available in your bundle. Inherits: Object. CONVERT NSDATA TO UIIMAGE with oven, lot you are entering into a fruit. UIImageView: It’s something like frame of the image or placeholder of the image where we’ll set our UIImage or image. Concept of UIImage and UIImageView (container) UIImage - Bitmap with different formats Ex png and jpeg. A UIImage is the representation of an image where as a UIImageView is a subclass of UIView which displays a UIImage. First Create UIView by following Coding. If you load an image from a file whose name includes the @2x modifier, its scale property is set to 2. storyboard file and drag the label and image view and drop into the table View cell like as shown below. This MATLAB function creates an image component in a new figure and returns the Image object. //replace "AppDelegate" with your app delegate name #define APP_DELEGATE ((AppDelegate *)[[UIApplication sharedApplication] delegate]) Posted 9th July 2012 by Unknown. I live with my friend and graduated in 2011 with a bachelor's degree in Information Technology and Web Design from RUPP. UIImage FromBundle (string name);. StructsAndEnums. Add “image view” in your view. Object; UIImage; show all Defined in: lib/ios/sugarcube-image/uiimage. The SEP stores this picture as a so-called template. Renderers can be disabled to make objects invisible (see enabled), and the materials can be accessed and modified through them (see material). You can get all kinds of effects, such as modifying. UIImage category that blurs an specified frame of a UIImage - Adrian2112/UIImage-BlurredFrame. UIImage * PortraitImage = [[UIImage alloc] initWithCGImage: LandscapeImage. 1 use an internal cache for images loaded from disk using imageNamed:. You give a function a name that identifies what it does, and this name is used to "call" the function to perform its task when needed. blue (if it is a color defined in UIColor class) if you want to define a color. If you load an image from a file whose name includes the @2x modifier, its scale property is set to 2. Apple lets you have a Default image name [email protected] for the newer 4″ tall iPhones. Hi all, I'm trying to figure out how to get a screenshot (don't need to save it, just store it in a variable) within xCode (not within Unity). An app can only be in one state at a particular time. The steps given below are required to be followed in order to Create a Rating Bar in Xamarin iOS, using Xamarin Studio. UIImage *picture = [UIImage imageNamed:@"myFile. [Foundation. To load an image from a framework bundle we need the longer UIImage initializer - init?(named:in:compatibileWith:). To do that, we use the jpegData() method, which takes one parameter: a quality value between 0 and 1, where 1 is "maximum quality". Remember Me. 0 bug in UIImage, this second part is all about UIGraphicsBeginImageContext and it’s ability to draw bitmap-based graphics. A type method can call another type method with the other method’s name, without needing to prefix it with the type name. At least iPhone OS 2. These states changes to the different state as per user or system actions. Now move to Main. UIImage imageNamed is now slow enough that it should not be called in preparations for TableView cells. In object-oriented and functional programming, an immutable object (unchangeable object) is an object whose state cannot be modified after it is created. png, the component will try to load an image file named X_Y. So, let’s declare a new category named Resizing on UIImage, and place that category’s definition in a file named UIImage+Resizing. It's no accident that Apple has chosen two different file formats for iOS device screen shots (PNG) and still photos from the camera (JPG). png"]; The imageNamed method, is actually really powerful. It can read and write images in a variety of formats (over 200) including PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript, PDF, and SVG. Step 3 In this step, give your project name (Ex: Sample) and solution name (Ex: Sample). Written in. af_threadSafeImage(with:scale:) Initializes and returns the image object with the specified data and scale in a thread-safe manner. What I did was to create a Category on the UIImage class. i have installed through pods , integration is successful as per message in terminal. [UIImage imageNamed] can bring down your application, and/or Springboard after confirming a few sources. and i was a fulltime developer at Realwat INC. Now, we're going to see if we can't go ahead and add an image to it. WeÕre also going to go ahead and tackle the meat of the problem and implement a method that will take a UIImage and carry out face detection using the OpenCV library. You are commenting using your WordPress. We'll assume you already have an UIImageView, containing an image, named 'image' :. If you wanted to change the design to add a prefix to every pet’s name, you could easily do so by modifying name here. If you load an image from a file whose name includes the @2x modifier, its scale property is set to 2. Dynamic Image Creation for UI Customization By Mobile Jazz on April 8, 2014 - 4 Minutes iOS developers deeply know the huge value of working with a good graphic designer. I am not completely sure my function is equivalent to the one you have (as I use polar coordinates to draw the polygon), but the produced result looks. While we upload an image to server it doesn't matter what is size of image but sometimes it matters pixel rate of image, here we need to reduce the pixel rate. Chose a name, select Use Storyboards and ARC and save the project somewhere. Once you’ve gotten the image location with NSBundle, you can pass it to the initWithContentsOfFile: method of UIImage. To color UIImage objects there's some extra work required. init?(system Name: String, with Configuration: UIImage. class and the iPhoneÕs own UIImage class. UIImageはUImageViewと一緒に使われることが多いです。 UIImageで取り込んだ画像を背景パターンとした例です。 画像サイズは844×562でプロジェクトに「Add Files to…」にて追加しました。 ViewController. The action of encoding to makes this task really slow. build from iOS project will solve that issue. The given code is the second step "How to save or write a clicked picture into Photo Library". Step 6 Now, add a new Cocoa Touch Class and name it Custom, extend with UIViewController and create the class. More interestingly, a CIContext is used here to create a UIImage (by way of a CGImage Ref intermediary representation), since UIImage(CIImage:) doesn’t often work as expected. If the image already exists as a resource then the LastWriteTime values of the two files are compared. In order to display an image on the screen, you’re most likely going to use UIImageView, which takes a UIImage object and presents it in the view hierarchy. The UIImage renders the bitmap to the current graphics context, configures transformation attributes, orientation, and scaling to name a few. Update: Apple released some code to do the same thing, and it's pretty easy to use. The UIImage instance contains the data, regardless of where it got it. The perform() method is the most important part of your activity. You can see from the method names weÕre going to implement methods to create an IplImage from a UIImage, and a UIImage from an IplImage. Inherits: Object. When you create an image from a file, you could store the name in a separate NSString*, and then refer to that stored name when necessary. Similarly an image with a @3x modifier has a scale of 3. If you came across to a requirement where you want to make UIImage Background Transparent then use below method to achieve it. Follow User Name. Use ImageMagick ® to create, edit, compose, or convert bitmap images. How to convert a UIImage to Black and White? Please do follow this post along with the post here //this button click even twill call the convertToBlackNWhite() method to sart the color conversion to black and white. These states changes to the different state as per user or system actions. It also provides disk caching and makes networking easier. Note: Although there are a lot of solutions for this like delta updating in NIB file. af_threadSafeImage(with:scale:) Initializes and returns the image object with the specified data and scale in a thread-safe manner. We'll assume you already have an UIImageView, containing an image, named 'image' :. xcworkspace) Open this workspace file in xcode. Access the name you associated with the UIImage instance (using objc_getAssociatedObject) anytime you want it. rb, lib/ios/sugarcube-ui/uiimage. Now, select Main. Introduction. I taught that was useful to write a extension method to convert byte array to UIImage and back. iOS/Swift is also smart enough to know when to drop the images if too much memory is being used and it is automatic so no worries there. UIGraphicsBeginImageContext is for example a handy way to display a thumbnail of an image, as I will explain in the following example. Use this workspace for future builds. Creating a CIContext is an expensive operation, so a cached context is used for repeated resizing. UIImage(ContentsOfFile: name. The other day I needed a new method in the UIImage not provided from the mono iOS framework. If the original image has an older LastWriteTime value then nothing needs to be done. While we upload an image to server it doesn't matter what is size of image but sometimes it matters pixel rate of image, here we need to reduce the pixel rate. h: We defined a new method, resizedImageWithSize:, which is now available to all of your UIImage objects - you only need to #import "UIImage+Resizing. png Data return}} Performing the Activity. Create an instance of UIImage called 'image' given the name of the image is 'placeholder. Default color is lightGray. The big issue of course is that UIImage:named: takes a hard-coded string, and returns an optional UIImage. Similarly, on a device with a double-resolution screen, when an image is obtained by name from the bundle, a file with the same name extended by @2x, if there is one, will be used automatically, with the resulting UIImage marked as double-resolution by assigning it a scale property value of 2. Now we need a NSArray with some Dictionaries. e the image that the user sekected by touching an image. For those who don’t like playgrounds, you can also create a new single view application. Aug 14, 2019 Tutorials Adding a UI to your Decentraland Scene The steps to a basic yet dynamic in-scene interface. The SEP stores this picture as a so-called template. if CFDictionaryGetValueIfPresent(cfProperties, Unmanaged. Опубликовано 14th September 2017 пользователем Unknown. Parameter name: input I am using a generic controller and repository pattern to save the object. The Maps app table view and map options view (vertical "toolbar") appear to hover above the map content. Android and the performance is amazing. If you just want to display a big red rectangle on the screen, an UIView with backgroundColor property set…. Select your app from the TARGETS section, then select the Info tab, and expand the URL Types section. A UIImage is the representation of an image where as a UIImageView is a subclass of UIView which displays a UIImage. Click the drop-down menu for “Shape Fill” and then select “Picture”. HelveticaNeue’. [UIImage imageNamed] run out of memory when it tries to cache too many images. toOpaque(), gifPropertiesPointer) == false { Now add gif image to your project and when you…. png file into the appropriate bucket. You can use React Native today in your existing Android and iOS projects or you can create a whole new app from scratch. if you know pointers of any private method, you are able to use private methods. Save UIImage to photo library. This will show you how to save and load images in a way that is very easy and straight forward. So I have coded these codes, for only printing a message when an image is selected. You are commenting using your WordPress. An initialized UIImage object, or nil if the method failed. I have uploaded the code sample used for the project which shows the conversion from image to byte and vice-versa. If the file loaded successfully, you’ll be able to access the image’s dimensions through the size property, which is a CGSize struct containing the width and height floating-point fields. Опубликовано 14th September 2017 пользователем Unknown. [Foundation. A couple of things UIImage is part of UIKit, so you need to import that before you can make anything work; I would consider naming otherwise, and creating the images in an initialiser - something like:. Written in. blue (if it is a color defined in UIColor class) if you want to define a color. First, go to the "Insert" tab and then insert a shape (preferably, a rectangle). Access the name you associated with the UIImage instance (using objc_getAssociatedObject) anytime you want it. Retina Graphics. Default color is lightGray. OK, I Understand. Storing an UIImage ⬇️ The storing part is quite easy. Contribute to swiftgif/SwiftGif development by creating an account on GitHub. Birmingham Hippodrome is one of the largest touring theatres in the UK. For example, suppose we press the Home button and a phone call comes in then the currently running app changes its state to the response. FromBundle("NameOfAssetCatalog") but it returns always null. If you load an image from a file whose name includes the @2x modifier, its scale property is set to 2. png, [email protected] How to check if a font is available in version of iOS? - ( void ) getAllFontName { NSArray *familyNames = [[ NSArray alloc ] initWithArray :[ UIFont familyNames ]];. ThreadSafe] public static UIKit. Certain programming languages, such as Lisp, Io, and Mathematica are homoiconic, meaning that their code is represented as a data primitive, which itself can be manipulated in code. The steps to a basic yet dynamic in-scene interface. I have just started with Flickr API iOS using ObjC. You are commenting using your WordPress. UIImageView: It’s something like frame of the image or placeholder of the image where we’ll set our UIImage or image. FromFile(), I even tested it out by adding sample images under the resources, and pull out the image via UIImage. Swift's unified function syntax is flexible enough to express anything from a simple C-style function with no parameter names to a complex Objective-C-style method with names and argument labels for each. HelveticaNeue’. Choosing Images with UIImagePickerController in Swift Last updated on August 18, 2019 If your Swift iOS app needs to import a picture from the user's device, you've come to the right place today. UIImage imageNamed is now slow enough that it should not be called in preparations for TableView cells. I am creating a UIImage with imageWithContentsOfFile and assign this to the image property of UIImageView. It works, but very slowly. September 22, 2010 by Paul Solt in iPhone. It also provides disk caching and makes networking easier. Click the drop-down menu for "Shape Fill" and then select "Picture". Open the Storyboard. Using nil is the same as passing the main bundle. Use ImageMagick ® to create, edit, compose, or convert bitmap images. UIImage(ContentsOfFile: name. When you work with still images, you use UIImage to display it. You Doodle Developers You want to add image editing and drawing to your iOS app but don't have the time to do so? Look no further. Here is the code in both sides: Unity:. Now we need a NSArray with some Dictionaries. In the very simplest case, an image file in your app's bundle can be obtained through the UIImage class method imageNamed:. OK, I Understand. If you wanted to change the design to add a prefix to every pet’s name, you could easily do so by modifying name here. View on GitHub Install in Dash Mapbox Navigation SDK for iOS Reference UIImage Extension Reference. fill') Other than some minor differences in syntax, our javascript now reads very much like Swift, and no longer must we bother with dumping cumbersome configuration objects into each assignment. Font names are ( in this case, it was '. UIImage(CGImage: cgImage) UIImage(CIImage: ciImage) Swift: Convert UIImage to CIImage //uiImage: UIImage //Convert to CIImage var ciImage = CIImage(image: uiImage). +(UIImage *)changeWhiteColorTransparent: (UIImage *)image{ CGImageRef rawImageRef=image. More generally, any unqualified method and property names that you use within the body of a type method will refer to other type-level methods and properties. Now, select Main. ( Log Out / Change ). For order without packet, spirt. Ok, yesterday we managed to get the "NextLevel" view flow logic working. h: We defined a new method, resizedImageWithSize:, which is now available to all of your UIImage objects - you only need to #import "UIImage+Resizing. Loads an image relative to the application bundle, and caches its result. Drag on a button and name it "Share". // Named const myImage = UIImage. The UIImage renders the bitmap to the current graphics context, configures transformation attributes, orientation, and scaling to name a few. Image processing on mobiles can be pretty performance intensive given the relatively low power of their CPU's (as compared to desktops). So cloud CONVERT NSDATA TO UIIMAGE a hall is the best resource on sense. blue (if it is a color defined in UIColor class) if you want to define a color. Chose a name, select Use Storyboards and ARC and save the project somewhere. When you create a UIImage, it takes a parameter called named that lets you specify the name of the image to load. [UIImage imageNamed] run out of memory when it tries to cache too many images. [UIImage imageNamed:] does only load images from the applications main bundle. It also provides disk caching and makes networking easier. WeÕre also going to go ahead and tackle the meat of the problem and implement a method that will take a UIImage and carry out face detection using the OpenCV library. The SEP stores this picture as a so-called template. UIImageView: It’s something like frame of the image or placeholder of the image where we’ll set our UIImage or image. You use image objects to represent image data of all kinds, and the UIImage class is capable of managing data for all image formats supported by the underlying platform. However, I don't know what should I change to make the printed message from " You have selected [0,0]" to "You have selected (the name of the image)". There is no size restriction if you perform size transformation on code. Book for the best musicals, dance, opera, ballet & Birmingham's favourite pantomime. The UIImage instance contains the data, regardless of where it got it. toOpaque(), gifPropertiesPointer) == false { Now add gif image to your project and when you…. This method looks in the system caches for an image object with the specified name and returns the variant of that image that is best suited for the main screen. You're going to need to learn two new pieces of code: UIImage has a jpegData() to convert it to a Data object in JPEG image format, and there's a method on Data called write(to:) that, well, writes its data to disk. UIImage* img = [UIImage imageNamed:@"image. Image processing on mobiles can be pretty performance intensive given the relatively low power of their CPU's (as compared to desktops). Object; UIImage; show all Defined in: lib/ios/sugarcube-image/uiimage. An app can only be in one state at a particular time. Here is the function to save your image first. So I get the font name, split it by '-', and take the first part of the split, ending with '. Now we need a NSArray with some Dictionaries. iOS supports high resolution displays via the scale property on UIScreen, UIView, UIImage, and CALayer classes. Export("imageNamed:")] [ObjCRuntime. Core Image is a powerful framework that lets you easily apply filters to images. When you work with still images, you use UIImage to display it. Then when you have your UIImage, you can just set the image property of the UIImageView. Add “image view” in your view. Step 1 Go To Xamarin Studio. Features and Capabilities • News • Community. Similarly, on a device with a double-resolution screen, when an image is obtained by name from the bundle, a file with the same name extended by @2x, if there is one, will be used automatically, with the resulting UIImage marked as double-resolution by assigning it a scale property value of 2. Click the + button, and add a URL scheme for your reversed client ID. Next, you declared two computed properties for name and image, where you return the pet's name and image respectively. Swift Tutorial: How to Use an Array in Swift Name it SwiftArrays. If you just want to display a big red rectangle on the screen, an UIView with backgroundColor property set…. CGImage; const CGFloat colorMasking[6] = {222, 255, 222, 255, 222,. Posted on August 30th, 2015. - To define UIImageView - They are really easy to understand. e UIImagePickerController - Some time user wants to select their photo from Album or capture photo and use their photo to. com account. ApiDefinition. So far I have this coded and I am currently stuck on this problem. If you load an image from a file whose name includes the @2x modifier, its scale property is set to 2. I live with my friend and graduated in 2011 with a bachelor's degree in Information Technology and Web Design from RUPP. h: We defined a new method, resizedImageWithSize:, which is now available to all of your UIImage objects – you only need to #import "UIImage+Resizing. Now that we have a UIImage containing an image and a path where we want to save it, we need to convert the UIImage to a Data object so it can be saved. How to convert a UIImage to Grayscale? Please do follow this post along with the post here Note that I have already shown you the coding on how to pick an image from the UIImagePickerViewController and display it in the UIImageView we have in the screen. Working with iOS Image Filters in Swift I have always found image processing interesting and fun. UIImage(ContentsOfFile: name. Displaying Icons with UIImage containing the name of the image we want to load, is a failable initializer. More generally, any unqualified method and property names that you use within the body of a type method will refer to other type-level methods and properties. png"]; The imageNamed method, is actually really powerful. We use cookies for various purposes including analytics. For PNG images, you may omit the filename extension. Given an image name X. Create UIView and work with UIImage. Next, you declared two computed properties for name and image, where you return the pet's name and image respectively. This is the simplest transformation you can perform: returning a value without modification. im = uiimage creates an image component in a new figure and returns the Image object. Here is the code in both sides: Unity:. MATLAB ® calls the uifigure function to create the new figure. Hi everyone, I created an asset catalog for one of my background images to test this approach in preparation for app slicing. [UIImage imageNamed:] does only load images from the applications main bundle. When you create a UIImage, it takes a parameter called named that lets you specify the name of the image to load. More interestingly, a CIContext is used here to create a UIImage (by way of a CGImage Ref intermediary representation), since UIImage(CIImage:) doesn't often work as expected. toOpaque(), gifPropertiesPointer) == false { Now add gif image to your project and when you…. FromBundle("NameOfAssetCatalog") but it returns always null. Storing an UIImage ⬇️ The storing part is quite easy. Some possibilities: [code]var imageA1: UIImage? = nil var imageA2: UIImage! var imageA3: UIImage = UIImage() var imageA4: UIImage? = UIImage() var imageA5: UIImage. September 22, 2010 by Paul Solt in iPhone. Step 6 Now, add a new Cocoa Touch Class and name it Custom, extend with UIViewController and create the class. It's no accident that Apple has chosen two different file formats for iOS device screen shots (PNG) and still photos from the camera (JPG). I just want to darken a UIImage, like when you pop a black layer onto a UIImageView, and set its alpha to 0. I've spent over 1500 hours making You Doodle the best drawing and art app on the app store. each image has a corresponding name. iOS/Swift is also smart enough to know when to drop the images if too much memory is being used and it is automatic so no worries there.