UIImageView xib里面拉伸图片技巧

拉伸图片的时候代码里和xib里面的图片名字去掉@2x,但是原始图片文件得要[e-mail]

The X and Y values seem to be the positions for the stretch starting point, relative to the entire width and height of the image, i.e. 0.5 would mean a point in the middle of the image.

Same thing for the Width and Height: sizes for the stretchable area, relative to the image size, i.e. setting it to a value of 1 / imageWidth would mean the stretchable area is 1 pixel wide. The strange thing is 0 also work fine for the blue pill button (could be for convenience reasons?).

Below, view modes are set to "Scale to Fill". The images are stretchable images fromhttps://github.com/0xced/UIKit-Artwork-Extractor.

This answer was inspired by http://www.slideshare.net/mystcolor/stretchable-images-in-uiimageview-

In cases where you want more than one pixel to stretch (ie. a pattern in the center of the button) the stretchable UIImage does not work.

The UIButton's contentStretch does also not work properly.

How I solved it: I subclassed UIButton and added a UIImageView *backgroundImageView as property and placed it at index 0 as a subview within the UIButton. I then ensure in layoutSubviews that it fits the button entirely and set the highlighted states of the imageView. All you need to do is handover a UIImageView with the correct contentStretch and contentMode applied.

.h file

@interface ButtonWithBackgroundImage : UIButton {    UIImageView *backgroundImageView;}@property (retain) UIImageView *backgroundImageView;+ (ButtonWithBackgroundImage*)button;@end

.m file

@implementation ButtonWithBackgroundImage@synthesize backgroundImageView;+ (ButtonWithBackgroundImage*)button {return [self buttonWithType:UIButtonTypeCustom];}- (void)setBackgroundImageView:(UIImageView*)img {    [backgroundImageView removeFromSuperview];    [backgroundImageView release];    backgroundImageView = [img retain];    if(backgroundImageView){        [self insertSubview:backgroundImageView atIndex:0];        [self setNeedsLayout];    }}- (void)setSelected:(BOOL)select {    [super setSelected:select];    // we subclass the setSelect method to highlight the background imageview[backgroundImageView setHighlighted:select||self.highlighted];}- (void)setHighlighted:(BOOL)highl {    [super setHighlighted:highl];    // we subclass the setHighlighted method to highlight the background imageview        [backgroundImageView setHighlighted:highl||self.selected];}- (void)layoutSubviews {    [super layoutSubviews];    self.backgroundImageView.frame = self.bounds;}- (void)dealloc {    [backgroundImageView release];    backgroundImageView = nil;    [super dealloc];}@end