Corner Radius Using UIBezierPath

Question

I'm Trying to round my view's corners using "UIBezierPath". I Only need to round topRight and Top left.

I have used Following code

 -(void)setMaskOnView:(UIView *)givenView
  {
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:givenView.bounds byRoundingCorners: (UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(10.0, 10.0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = givenView.bounds;
maskLayer.path  = maskPath.CGPath;
givenView.layer.mask = maskLayer;
} 

But my TopRight Corner does not round.

I've used

UIRectCornerAllCorners

But it does not round my right corners

Any thing i'm missing??

Answer 1

I suggest different approach. Load image with rounded top corners and set is as contents of CALayer . Set this layer as mask of your view layer. Update size of your mask layer in layoutSubivews of a given view or viewDidLayoutSubviews of given view controller.

Loading image as layer contenst

CALayer *maskLayer = [[CALayer alloc] init];
UIImage *maskImage = [UIImage imageNamed:@"mask_image.png" inBundle:[NSBundle mainBundle] compatibleWithTraitCollection:nil];
maskLayer.contents = (__bridge id _Nullable)(maskImage.CGImage);

mainLayer.mask = maskLayer

[EDIT] Answering your questions in comments

Either using CAShapeLayer or image as mask you have to resize your mask layer so it will have the same size as masked layer. If we are talking about UITableViewCell create your own derived cell and update mask shape in layoutSubviews . Below is example code (MyTableCell is loaded from storyboard):

@interface MyTableCell ()

@property (nonatomic, strong) CAShapeLayer *maskLayer;

@end

@implementation MyTableCell

- (void)awakeFromNib
{
    self.maskLayer = [[CAShapeLayer alloc] init];
    self.layer.mask = self.maskLayer;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    self.maskLayer.path = [self maskPath].CGPath;
}

- (UIBezierPath *)maskPath
{
    return [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners: (UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(10.0, 10.0)];

}

@end

Answer 2

I'm using this subclass

.h

@interface UIView (custom)

- (UIView *)setRoundedCorners:(UIRectCorner)corners withRadius:(CGFloat)radius;

@end

.m

@implementation UIView (custom)

    - (UIView *)setRoundedCorners:(UIRectCorner)corners withRadius:(CGFloat)radius
    {
        UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                                       byRoundingCorners:corners
                                                             cornerRadii:CGSizeMake(radius, radius)];

        CAShapeLayer *maskLayer = [CAShapeLayer layer];

        maskLayer.frame = self.bounds;

        maskLayer.path = maskPath.CGPath;

        self.layer.mask = maskLayer;

        return self;
    }
@end

Using it like:

[YOURVIEW setRoundedCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight | UIRectCornerTopLeft | UIRectCornerTopRight withRadius:15];