ios 切割圆角

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常用方法

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button.layer.cornerRadius = 10.0f; //弧度
button.layer.masksToBounds = YES;

贝塞尔曲线切割

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/* 贝塞尔曲线切割 */
   /**
     *
     *  @param UIRectCorner  
     *  左上 UIRectCornerTopLeft     = 1 << 0,  
        左下 UIRectCornerBottomLeft  = 1 << 2,  
        右下 UIRectCornerBottomRight = 1 << 3,  
        所有角 UIRectCornerAllCorners  = ~0UL
     *
     */
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:button.bounds byRoundingCorners:UIRectCornerTopLeft |  UIRectCornerBottomLeft cornerRadii:button.bounds.size];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
    //设置大小
    maskLayer.frame = button.bounds;
    //设置图形样子
    maskLayer.path = maskPath.CGPath;
    button.layer.mask = maskLayer;