// 这是一个UIImage 的分类 （ UIImage+Extension.h ）
UIImage+Extension.h
#import <UIKit/UIKit.h>
@interface UIImage (Extension)
+ (UIImage *)resizableImage:(NSString *)name;
@end
UIImage+Extension.m
#import "UIImage+Extension.h"
@implementation UIImage (Extension)
+ (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)];
}
@end
// 在其他地方使用时调用
[self.button setBackgroundImage:[UIImage resizableImage:@"chat_recive_nor"] forState:UIControlStateNormal];