图像角半径仅左下角

Question

我想要将圆角半径精确地设置为圆形，只有左下角。我已经完成了它，但是底部形状看起来不像精确的圆形，所以我该如何解决这个问题

Answer 1

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.imageView.bounds byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(10.0, 10.0)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.imageView.bounds;
maskLayer.path  = maskPath.CGPath;
self.imageView.layer.mask = maskLayer;

Answer 2

我有同样的问题，我解决了这个问题：

- (void)setMaskTo:(UIView*)view {
CAShapeLayer *rect = [[CAShapeLayer alloc] init];
[rect setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height/2)];
rect.backgroundColor = ([UIColor grayColor]).CGColor;

UIBezierPath *shape = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0,rect.frame.size.height/2,self.view.frame.size.width,self.view.frame.size.height/2)];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = shape.CGPath;
shapeLayer.fillColor = [UIColor grayColor].CGColor;

CAShapeLayer *viewMask = [[CAShapeLayer alloc] init];
[viewMask addSublayer:shapeLayer];
[viewMask addSublayer:rect];

view.layer.mask = viewMask;
}