返回一张可以随意拉伸不变形的图片

//文件UIImage+Extension.h

#import <UIKit/UIKit.h>

@interface UIImage (Extension)

+ (UIImage *)resizableImage:(NSString *)name;

@end

//--------------------------------------------------------

//文件UIImage+Extension.m

#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)];

}

@end