UIView设置指定角为圆角的代码

提供一个UIView设置指定角为圆角的代码，可以在按钮上试试，如果不行的话可以考虑将按钮换成UIView，给UIView加个单击手势，希望对你有帮助！

UIView *whiteView = [[UIView alloc] initWithFrame:CGRectMake(30, CGRectGetMaxY(pickerView.frame), With-60, 50)];

    whiteView.backgroundColor = [UIColor whiteColor];

    UIBezierPath *maskPath1 = [UIBezierPath bezierPathWithRoundedRect:whiteView.bounds byRoundingCorners:UIRectCornerBottomLeft
| UIRectCornerBottomRight cornerRadii:CGSizeMake(5, 5)];

    CAShapeLayer *maskLayer1 = [[CAShapeLayer alloc] init];

    maskLayer1.frame = whiteView.bounds;

    maskLayer1.path = maskPath1.CGPath;

    whiteView.layer.mask = maskLayer1;