图片拉伸
注意：可拉伸的范围都是距离leftCapWidth后的1竖排像素，和距离topCapHeight后的1横排像素。
参数的意义是，如果参数指定10，5。那么，图片左边10个像素，上边5个像素。不会被拉伸，x坐标为11和一个像素会被横向复制，y坐标为6的一个像素会被纵向复制。
- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight; @property(nonatomic,readonly) NSInteger leftCapWidth; // default is 0. if non-zero, horiz. stretchable. right cap is calculated as width - leftCapWidth - 1 @property(nonatomic,readonly) NSInteger topCapHeight; // default is 0. if non-zero, vert. stretchable. bottom cap is calculated as height - topCapWidth - 1
UIImage *img=[UIImage imageNamed:@"bubbleSelf.png"]; img=[img stretchableImageWithLeftCapWidth:15 topCapHeight:12]; UIImageView *imgView=[[UIImageView alloc]initWithImage:img]; [imgView setFrame:CGRectMake(10, 10, 200, 200)]; [self. view addSubview:imgView];
封装的一个拉伸方法，可以作为UIImage的拓展使用
+ (UIImage *)resizedImage:(NSString *)name
{
UIImage *image = [UIImage imageWithName:name];
return [image stretchableImageWithLeftCapWidth:image.size.width * 0.5 topCapHeight:image.size.height * 0.5];
}
时间： 2024-08-26 05:15:14