Ios 图像角半径仅在左下角和右下角

我想在圆角半径准确的形状只有底部角落左右。我已经做了，但底部形状看起来不像是完全圆的，所以我如何解决这个问题

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我也有同样的问题，我是这样解决的：

- (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;
}

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查看以下链接，查看此链接可能对您有帮助。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；我用了那个代码，但不是底部的圆形。看看我在Botton的图片，当这个代码在iphone6上运行时，imageview在右边留下了一些宽度的空间。好的，我用了你的代码并给出了CGSizeMake（150.0，150.0）]但结果和我在底部的图片一样，不是完全的圆形，当这个代码在iPhone6上运行时，宽度和高度是一样的，它在宽度上占用了一些空间。

- (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;
}