使用CAShaperLayer和UIBezier可解。
corners参数可选：corners:UIRectCornerTopRight | UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight
@implementation UIView (Extension)
///设置圆角 corners:UIRectCornerTopRight | UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight
- (void)bezierCornerRadius:(CGFloat)radius rectCorners:(UIRectCorner)corners {
self.layer.masksToBounds = YES;
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(radius, radius)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.bounds;
maskLayer.path = maskPath.CGPath;
self.layer.mask = maskLayer;
}
@end
