iOS图片不规则剪切

      最近项目中需求中增加了一个聊天图片剪切成不规则的要求，查看了一下相关资料。结果用iOS SDK自带的API就可以实现如下这个效果。

    

    // 传进去一个UIView进行绘制，返回一个 CAShapeLayer 对象，然后把改对象设置为view.layer.mask属性。

    UIImageView *tempView = [[UIImageView alloc] init];

    CAShapeLayer *layer = [self createMaskLayerWithView:tempView];

    tempView.layer.mask = layer;

- (CAShapeLayer *)createMaskLayerWithView:(UIView *)view{

    CGFloat viewWidth = CGRectGetWidth(view.frame);

    CGFloat viewHeight = CGRectGetHeight(view.frame);

    

    CGFloat rightSpace = 5.0;

    CGFloat topSpace = 7.0;

    CGPoint point1 = CGPointMake(rightSpace, 0);

    CGPoint point2 = CGPointMake(rightSpace, topSpace);

    CGPoint point3 = CGPointMake(0, topSpace);

    CGPoint point4 = CGPointMake(rightSpace , topSpace + 6.0);

    CGPoint point5 = CGPointMake(rightSpace, viewHeight);

    CGPoint point6 = CGPointMake(viewWidth, viewHeight);

    CGPoint point7 = CGPointMake(viewWidth, 0);

    

    

//根据自己描绘的路径，绘制想要的形状。

    UIBezierPath *path = [UIBezierPath bezierPath];

    [path moveToPoint:point1];

    [path addLineToPoint:point2];

    [path addLineToPoint:point3];

    [path addLineToPoint:point4];

    [path addLineToPoint:point5];

    [path addLineToPoint:point6];

    [path addLineToPoint:point7];

    [path closePath];

    

    CAShapeLayer *layer = [CAShapeLayer layer];

    layer.path = path.CGPath;

    

    return layer;

}