iOS 图片拉伸

参考链接

在iOS6.0中，UIImage提供了一个方法处理图片拉伸

- (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode  

方法解释:

参数: resizingMode,指定拉伸模式

UIImageResizingModeStretch：拉伸模式，通过拉伸UIEdgeInsets指定的矩形区域来填充图片

UIImageResizingModeTile：平铺模式，通过重复显示UIEdgeInsets指定的矩形区域来填充图片

UIEdgeInsets：可以通过设置UIEdgeInsets的left、right、top、bottom来分别指定左端盖宽度、右端盖宽度、顶端盖高度、底端盖高度

057B6B77-4C1C-4274-960A-77068C92C079.png

拉伸其实就是拉伸中间的正方型,这样才能保证整个图片不变形

    CGFloat margin = 5;
    UIImage *image = [UIImage imageNamed:@"message_backGround"];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 100, [UIScreen mainScreen].bounds.size.width- 20, 140)];
    UIEdgeInsets insets = UIEdgeInsetsMake((image.size.height / 2) - margin, (image.size.width / 2) - margin, (image.size.height / 2) - margin, (image.size.width / 2) - margin);
    image = [image resizableImageWithCapInsets:insets resizingMode:UIImageResizingModeTile];
    imageView.image = image;
    [self.view addSubview:imageView];

margin的值越小越好,最后来看效果图

2C4DEF4B-F234-4CB9-964A-C01E08C9FBCC.png