如何设置imageView的圆角半径？ [英] How to set corner radius of imageView?

问题描述

在Objective-C中这样的行

In Objective-C such line

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0f;

完成它的工作，我在Swift中尝试使用类比

does its job, I tried it in Swift using analogy

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0

并且它不会改变任何东西，角落和以前一样。而且，Xcode没有显示任何语法错误。 Swift是否支持任何其他方式来实现这一目标？我在这里检查了一些其他线程，通常它是以上面显示的方式在Swift中完成的。

and it doesn't change anything, the corners are the same as before. Moreover, Xcode does not show any syntax errors. Does Swift support any other way to reach this goal? I checked some other threads here and usually it's getting done in Swift in the way showed above.

推荐答案

图层绘制出剪辑区域，需要将其设置为屏蔽边界：

Layer draws out of clip region, you need to set it to mask to bounds:

self.mainImageView.layer.masksToBounds = true

来自 docs ：

默认情况下，圆角半径不适用于
图层内容属性中的图像;它仅适用于图层的背景颜色和
边框。但是，将masksToBounds属性设置为
true会导致内容被裁剪为圆角

By default, the corner radius does not apply to the image in the layer’s contents property; it applies only to the background color and border of the layer. However, setting the masksToBounds property to true causes the content to be clipped to the rounded corners

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