image disappears when styling class to make a round image(样式类制作圆形图像时图像消失)

本文介绍了样式类制作圆形图像时图像消失的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

class RoundImage: UIImageView {

    override func awakeFromNib() {
        super.awakeFromNib()
        setupView()
    }

     ...

    func setupView() {
        self.layer.borderWidth = borderWidth
        self.layer.borderColor = borderColor
        self.clipsToBounds = clip
        self.layer.cornerRadius = self.frame.size.width / 2
    }


    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        setupView()
    }

}

我正在使用以下类来设置我的 UIImageViews 的样式.我想让它们变成圆形.当我添加以下代码行 self.layer.cornerRadius = self.frame.size.width/2 使这成为可能时，我的整个图像消失了.当我使用像 50 这样的硬编码值(因为我的图像的宽度是 100)时，它可以工作.但是当我想以这种方式使其动态化时，它似乎失败了.

I am using the following class to style my UIImageViews. I want to make them circular. When I add the following line of code self.layer.cornerRadius = self.frame.size.width / 2 to make this possible, my entire image disappears. When I use a hardcoded value like 50 (since the width of my image is 100) it works. But when I want to make it dynamic this way, it seems to fail.

我在这里错过了什么?

推荐答案

我前几天遇到了这个问题.您应该在图层修改之前添加 layoutIfNeeded().

I faced with this problem a few days ago. You should add layoutIfNeeded() before layer modifications.

在你的情况下:

func setupView() {
        self.layoutIfNeeded()
        self.layer.borderWidth = borderWidth
        self.layer.borderColor = borderColor
        self.clipsToBounds = clip
        self.layer.cornerRadius = self.frame.size.width / 2
 }

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