试图掩盖图像周围的圆圈不起作用 [英] Attempting to mask a circle around an image not working

问题描述

我有一个图像，我试图掩盖一个圆圈，以便图像显示为圆形.这有点奏效，但圆圈在顶部和底部都有一个点.

I have an image that I am attempting to mask a circle around so the image appears round. This somewhat works but the circle comes to a point on the top and bottom.

profileImageView.layer.cornerRadius = profileImageView.frame.size.width/2;
profileImageView.layer.masksToBounds = YES;

这段代码应该画一个完美的圆吗?它似乎在一个地方画了一个圆圈，但在另外两个地方，它不能正常工作.

Should this code be drawing a perfect circle? It seems to draw a circle in one place but in two other places, its not working correctly.

推荐答案

我用 CAShapeLayer 屏蔽图像视图的效果最好:

I have had the best results masking the image view with a CAShapeLayer:

CGFloat radius = self.profileImageView.frame.size.width / 2.0;
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(radius, radius) radius:radius startAngle:0 endAngle:M_PI * 2.0 clockwise:TRUE];
CAShapeLayer *layer = [CAShapeLayer layer];
layer.path = path.CGPath;
layer.lineWidth = 0;
self.profileImageView.layer.mask = layer;

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