【深入浅出IOS开发】彩票-按钮中图片的拉伸

#import <UIKit/UIKit.h>

@interface UIImage (Extension)
+ (UIImage *)resizableImage:(NSString *)name;
@end

#import "UIImage+Extension.h"

@implementation UIImage (Extension)
/**
*  返回一张可以随意拉伸不变形的图片
*  @param name 图片名字
*/
+ (UIImage *)resizableImage:(NSString *)name
{
UIImage *normal = [UIImage imageNamed:name];
CGFloat w = normal.size.width * 0.5;
CGFloat h = normal.size.height * 0.5;
return [normal resizableImageWithCapInsets:UIEdgeInsetsMake(h, w, h, w)];
}