UIView中的圆两个角

Round two corners in UIView(UIView中的圆两个角)

问题描述

不久前，我发布了一个关于

A little while ago I posted a question about rounding just two corners of a view, and got a great response, but am having problems implementing it. Here is my drawRect: method:

- (void)drawRect:(CGRect)rect {
    //[super drawRect:rect]; <------Should I uncomment this?
    int radius = 5;
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextBeginPath(context);
    CGContextAddArc(context, rect.origin.x + radius, rect.origin.y + rect.size.height - radius, radius, M_PI, M_PI / 2, 1);
    CGContextAddArc(context, rect.origin.x + rect.size.width - radius, rect.origin.y + rect.size.height - radius, radius, M_PI / 2, 0.0f, 1);
    CGContextClosePath(context);
    CGContextClip(context);
}

The method is being called, but doesn't seem to affect the outcome of the view. Any ideas why?

CACornerMask introduced in iOS 11, which help to define topleft, topright, bottomleft, bottom right in view layer. Below is example to use.

Here I try to rounded only two top corner:

myView.clipsToBounds = true
myView.layer.cornerRadius = 10
myView.layer.maskedCorners = [.layerMinXMinYCorner,.layerMaxXMinYCorner]

FYI Ref:

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