How can I take an UIImage and give it a black border

Question

How can I set the border of a UIImage

User · Answer

You can t add a border  but this would work for the same effect  You could also make the UIView called blackBG in this example into a UIImageView with a border image and a blank middle  and then you d have a custom image border instead of just black   UIView  blackBG     UIView alloc  initWithFrame CGRectMake 0 0 100 100     blackBG backgroundColor    UIColor blackColor    UIImageView  myPicture     UIImageView alloc  initWithImage                             UIImage imageNamed    myPicture jpg      int borderWidth   10   myPicture frame   CGRectMake borderWidth                               borderWidth                               blackBG frame size width-borderWidth 2                               blackBG frame size height-borderWidth 2      blackBG addSubview  myPicture

User · Answer

If you know the dimensions of your image  then adding a border to the UIImageView s layer is the best solution AFAIK  Infact  you can simply setFrame your imageView to x y image size width image size height  In case you have an ImageView of a fixed size with dynamically loaded images which are getting resized  or scaled to AspectFit   then your aim is to resize the imageview to the new resized image   The shortest way to do this      containerView is my UIImageView containerView layer borderWidth   7  containerView layer borderColor    UIColor colorWithRed 0 22 green 0 22 blue 0 22 alpha 1 0  CGColor      this is the key command  containerView setFrame AVMakeRectWithAspectRatioInsideRect image size  containerView frame      But to use the AVMakeRectWithAspectRatioInsideRect  you need to add this    import  lt AVFoundation AVFoundation h gt    import statement to your file and also include the AVFoundation framework in your project  comes bundled with the SDK

User · Answer

import  lt QuartzCore CALayer h gt    UIImageView  imageView    UIImageView alloc init   imageView layer masksToBounds   YES  imageView layer borderColor    UIColor blackColor  CGColor  imageView layer borderWidth   1        This code can be used for adding UIImageView view border

User · Answer

For those looking for a plug-and-play solution on UIImage  I wrote CodyMace s answer as an extension   Usage  let outlined   UIImage named   something    outline    extension UIImage        func outline   - gt  UIImage             let size   CGSize width  self size width  height  self size height          UIGraphicsBeginImageContext size          let rect   CGRect x  0  y  0  width  size width  height  size height          self draw in  rect  blendMode   normal  alpha  1 0          let context   UIGraphicsGetCurrentContext           context  setStrokeColor red  0  green  0  blue  0  alpha  1          context  stroke rect          let newImage   UIGraphicsGetImageFromCurrentImageContext           UIGraphicsEndImageContext            return newImage

User · Answer

you need to import  QuartzCore QuartzCore h    amp  then for ImageView in border   imageView layer setBorderColor    UIColor blackColor  CGColor      imageView layer setBorderWidth  2 0     imageView layer setCornerRadius  5 0

User · Answer

I use this method to add a border outside the image  You can customise the border width in boderWidth constant   Swift 3  func addBorderToImage image   UIImage  - gt  UIImage       let bgImage   image cgImage     let initialWidth    bgImage  width       let initialHeight    bgImage  height       let borderWidth   Int Double initialWidth    0 10       let width   initialWidth   borderWidth   2     let height   initialHeight   borderWidth   2     let data   malloc width   height   4       let context   CGContext data  data                          width  width                          height  height                          bitsPerComponent  8                          bytesPerRow  width   4                          space   bgImage  colorSpace                            bitmapInfo  CGImageAlphaInfo premultipliedLast rawValue        context  draw bgImage   in  CGRect x  CGFloat borderWidth   y  CGFloat borderWidth   width  CGFloat initialWidth   height  CGFloat initialHeight        context  setStrokeColor UIColor white cgColor      context  setLineWidth CGFloat borderWidth       context  move to  CGPoint x  0  y  0       context  addLine to  CGPoint x  0  y  height       context  addLine to  CGPoint x  width  y  height       context  addLine to  CGPoint x  width  y  0       context  addLine to  CGPoint x  0  y  0       context  strokePath        let cgImage   context  makeImage       let uiImage   UIImage cgImage  cgImage        free data       return uiImage

User · Answer

You can do this by creating a new image  also answered in your other posting of this question    -  UIImage  imageWithBorderFromImage  UIImage  source      CGSize size    source size     UIGraphicsBeginImageContext size     CGRect rect   CGRectMake 0  0  size width  size height      source drawInRect rect blendMode kCGBlendModeNormal alpha 1 0      CGContextRef context   UIGraphicsGetCurrentContext      CGContextSetRGBStrokeColor context  1 0  0 5  1 0  1 0      CGContextStrokeRect context  rect     UIImage  testImg    UIGraphicsGetImageFromCurrentImageContext      UIGraphicsEndImageContext      return testImg        This code will produce a pink border around the image   However if you are going to just display the border then use the layer of the UIImageView and set its border

User · Answer

all these answers work fine BUT add a rect to an image  Suppose You have a shape  in my case  a butterfly  and You want to add a border  a red border    we need two steps  1  take the image  convert to CGImage  pass to a function to draw offscreen in a context using CoreGraphics  and give back a new CGImage  2  convert to uiimage back and draw      remember to release object     CGImageRef createResizedCGImage  CGImageRef image toWidth  int width andHeight  int height      create context  keeping original image properties CGColorSpaceRef colorspace   CGColorSpaceCreateDeviceRGB    CGContextRef context   CGBitmapContextCreate NULL  width                                               height                                               8                                              4   width                                               colorspace                                               kCGImageAlphaPremultipliedFirst                                                   CGColorSpaceRelease colorspace    if context    NULL      return nil      draw image to context  resizing it  CGContextSetInterpolationQuality context  kCGInterpolationDefault    CGSize offset   CGSizeMake 2 2   CGFloat blur   4     CGColorRef color    UIColor redColor  CGColor  CGContextSetShadowWithColor   context  offset  blur  color    CGContextDrawImage context  CGRectMake 0  0  width  height   image      extract resulting image from context CGImageRef imgRef   CGBitmapContextCreateImage context   CGContextRelease context   return imgRef       -  void viewDidLoad    super viewDidLoad      Do any additional setup after loading the view  typically from a nib   CGRect frame   CGRectMake 0 0 160  122   UIImage   img    UIImage imageNamed   butterfly       take low res OR high res  but frame should be the low-res one  imgV     UIImageView alloc initWithFrame frame    imgV setImage  img   imgV center   self view center   self view addSubview  imgV    frame size width   frame size width   1 3  frame size height   frame size height  1 3  CGImageRef cgImage   ViewController createResizedCGImage  img CGImage  toWidth frame size width andHeight  frame size height     imgV2     UIImageView alloc initWithFrame frame    imgV2 setImage   UIImage imageWithCGImage cgImage         release  if  cgImage  CGImageRelease cgImage     self view addSubview  imgV2        I added a normal butterfly and a red-bordered bigger butterfly

User · Answer

This function will return you image with black border try this   hope this will help you  -  UIImage   addBorderToImage  UIImage   image frameImage  UIImage   blackBorderImage       CGSize size   CGSizeMake image size width image size height       UIGraphicsBeginImageContext size        CGPoint thumbPoint   CGPointMake 0 0         image drawAtPoint thumbPoint         UIGraphicsBeginImageContext size       CGImageRef imgRef   blackBorderImage CGImage      CGContextDrawImage UIGraphicsGetCurrentContext    CGRectMake 0  0  size width size height   imgRef       UIImage  imageCopy   UIGraphicsGetImageFromCurrentImageContext        UIGraphicsEndImageContext         CGPoint starredPoint   CGPointMake 0  0        imageCopy drawAtPoint starredPoint       UIImage  imageC   UIGraphicsGetImageFromCurrentImageContext        UIGraphicsEndImageContext        return imageC

User · Answer

Another way is to do directly from designer   Select your image and go under  Show the Identity inspector    Here you can manually add  User Defined Runtime Attributes    layer borderColor layer borderWidth

User · Answer

You could manipulate the image itself  but a much better way is to simply add a UIView that contains the UIImageView  and change the background to black   Then set the size of that container view to a little bit larger than the UIImageView

User · Answer

You can add border to the UIImageView  and then change the size of the UIimageView according to the image size    import  lt QuartzCore QuartzCore h gt       adding border to the imageView  imageView layer setBorderColor    UIColor whiteColor  CGColor     imageView layer setBorderWidth  2 0       resize the imageView to fit the image size CGSize size    image size   float factor   size width   self frame size width  if  factor  lt  size height   self frame size height        factor   size height   self frame size height     CGRect rect   CGRectMake 0  0  size width factor  size height factor   imageView frame   rect    Make sure you to set the origin of the imageView to the center

User · Answer

imageView ProfileImage layer cornerRadius  10 0f  imageView ProfileImage layer borderColor     UIColor blackColor  CGColor   imageView ProfileImage layer borderWidth   4f  imageView ProfileImage layer masksToBounds   YES

User · Answer

With OS   3 0 you can do this     you need this import  import  lt QuartzCore QuartzCore h gt    imageView layer setBorderColor    UIColor blackColor  CGColor     imageView layer setBorderWidth  2 0

User · Answer

In Swift 3 here s how you do it to the UIImage itself   let size   CGSize width  image size width  height  image size height  UIGraphicsBeginImageContext size  let rect   CGRect x  0  y  0  width  size width  height  size height  image  draw in  rect  blendMode   normal  alpha  1 0  let context   UIGraphicsGetCurrentContext   context  setStrokeColor red  0  green  0  blue  0  alpha  1  context  stroke rect  let newImage   UIGraphicsGetImageFromCurrentImageContext   UIGraphicsEndImageContext    self imageView image   newImage

User · Answer

I have created a class which adds a border to imageView h  Use this class instead of UIImageView I have given a padding of 4  You can give as per your wish   class UIBorderImageView  UIView    private lazy var imageView  UIImageView         let imageView   UIImageView       imageView contentMode    scaleAspectFit     imageView translatesAutoresizingMaskIntoConstraints   false     return imageView      override init frame  CGRect        super init frame  frame      self backgroundColor   UIColor White       self layer borderColor   UIColor GreyMedium   cgColor     self layer borderWidth   1 0     self layer cornerRadius   4 0     self layer masksToBounds   true     self setUpViews      required init  coder aDecoder  NSCoder        fatalError  init coder   has not been implemented      private func setUpViews        self addSubview imageView      self addConstraintsWithFormat format   H  -4- v0 -4-    views  imageView      self addConstraintsWithFormat format   V  -4- v0 -4-    views  imageView     func configureImageViewWith image UIImage       self imageview image   image

[iphone] How can I take an UIImage and give it a black border?

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