Simple image stretching and simple image stretching

Simple image stretching and simple image stretching

The initial image size is 25*28 pixels.

Now we try to create two buttons on the Root

 

UIButton * button = [UIButton buttonWithType: UIButtonTypeCustom];

Button. frame = CGRectMake (50,100, 25, 28 );

[Button setBackgroundImage: [UIImage imageNamed: @ "btn.png"] forState: UIControlStateNormal];

[Self. view addSubview: button];

UIButton * button1 = [UIButton buttonWithType: UIButtonTypeCustom];

Button1.frame = CGRectMake (50,200,200, 28 );

UIImage * image = [UIImage imageNamed: @ "btn.png"];

[Button1 setBackgroundImage: image forState: UIControlStateNormal];

[Self. view addSubview: button1];

Image effect before stretching

 

In iOS 5.0, there is a new way for UIImage to handle image stretching problems.

-(UIImage *) resizableImageWithCapInsets :( UIEdgeInsets) capInsets

CGFloat left = 12; // left end width

CGFloat right = 12; // right side width

UIEdgeInsets insets = UIEdgeInsetsMake (0, left, 0, right );

// Assign a value after scaling

UIImage * new = [image resizableImageWithCapInsets: insets];

[Button1 setBackgroundImage: new forState: UIControlStateNormal];

[Self. view addSubview: button1];

In iOS6.0, UIImage provides another method for processing image stretching.

-(UIImage *) resizableImageWithCapInsets :( UIEdgeInsets) capInsets resizingMode :( UIImageResizingMode) resizingMode

Compared with iOS5.0, only one UIImageResizingMode parameter is added to specify the stretch mode:

UIImageResizingModeStretch: stretch mode. Fill the image by stretching the area of the rectangle specified by UIEdgeInsets.

UIImageResizingModeTile: tiled mode. The image is filled by repeatedly displaying the rectangle area specified by UIEdgeInsets.

 

CGFloat left = 12; // left end width

CGFloat right = 12; // right side width

UIEdgeInsets insets = UIEdgeInsetsMake (0, left, 0, right );

// Assign a value after scaling

UIImage * new = [image resizableImageWithCapInsets: insets resizingMode: UIImageResizingModeStretch];

[Button1 setBackgroundImage: new forState: UIControlStateNormal];

[Self. view addSubview: button1];

 

The following figure shows the stretched image.