IOS 指定某个角为圆角

UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(120, 10, 80, 80)];view2.backgroundColor = [UIColor redColor];[self.view addSubview:view2];    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view2.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];maskLayer.frame = view2.bounds;maskLayer.path = maskPath.CGPath;view2.layer.mask = maskLayer;

指定了需要成为圆角的角。该参数是UIRectCorner类型的，可选的值有：

* UIRectCornerTopLeft* UIRectCornerTopRight* UIRectCornerBottomLeft* UIRectCornerBottomRight* UIRectCornerAllCorners

从名字很容易看出来代表的意思，使用“|”来组合就好了。