How to crop and stretch in iOS

Question

I need to stretch the image to the right, and the left side semicircle remains as it is. also need a semicircle in the center

I tried the concept of slicing and also tried under code

UIImage *image = self.imgBGBottom.image;
CGFloat capWidth =  floorf(image.size.width / 2) - 50;
CGFloat capHeight =  0;
UIImage *capImage = [image resizableImageWithCapInsets:
                     UIEdgeInsetsMake(capHeight, capWidth, capHeight, capWidth)];

[self.imgBGBottom setImage:capImage];

but it does not work for me

Please help me. Thanks in advance.

Answer 1

You use a function, use - (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeightinstead - (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets.

Install the top, left cover, to stretch the image as described in the following code.

Objective-c

UIImage *image = [UIImage imageNamed:@"test"];

CGFloat capTop =  50;  // top cap to keep half round as is
CGFloat capLeft = 5; // To repeat it or stretch equally.
UIImage *capImage = [image stretchableImageWithLeftCapWidth:capLeft topCapHeight:capTop];

Swift

let image =  UIImage(named: "stretchableImage")

let capTop:Int =  50;  // top cap to keep half round as is
let capLeft:Int = 5; // To repeat it or stretch equally.
let capImage = image?.stretchableImage(withLeftCapWidth: capLeft, topCapHeight: capTop)

Alternet solution

The same result can be achieved using the following function.

Objective-c

UIImage *stretchedImage = [image resizableImageWithCapInsets:
                 UIEdgeInsetsMake(50, 50, 0, 50)];

Swift

var stretchedImage = image?.resizableImage(withCapInsets: UIEdgeInsets(top: 50, left: 50, bottom: 0, right: 50), resizingMode: .stretch) 

. , (ImageView, Button ..). .

Answer 2

UIImage *image = self.imgBGBottom.image;
CGFloat capWidth =  floorf(image.size.width / 2) - 50;
CGFloat capTop =  50;  //the value is determined by the half circle height,i guess it is 50 height
CGFloat capBottom = 0;
UIImage *capImage = [image resizableImageWithCapInsets:
                             UIEdgeInsetsMake(capHeight, capTop, capBottom, capWidth)];

[self.imgBGBottom setImage:capImage];