//切其中几个角

+ (void)makeBorderForView:(UIView *)view rectConer:(UIRectCorner)rectConer bounds:(CGRect)bounds redius:(CGFloat)redius{ 

   UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:rectConer cornerRadii:CGSizeMake(redius, redius)];    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];    maskLayer.frame = bounds;    maskLayer.path = maskPath.CGPath;    view.layer.mask = maskLayer;

}

调用

    [CALayer makeBorderForView:self.profitView rectConer:UIRectCornerTopLeft | UIRectCornerTopRight bounds:CGRectMake(0, 0, SCREENWIDTH - 30, roundf(self.profitView.bounds.size.height)) redius:8];