swift - 如何制作自定义圆形 UIImageView 子类？

Question

我想制作我的自定义回合 UIImageView 并在 Storyboard 中显示它。

接下来我做了:

@IBDesignable
class RoundedImageView: UIImageView {
    override init(image: UIImage?) {
        super.init(image: image)
        super.layer.cornerRadius = super.frame.size.height / 2
        self.layer.cornerRadius = self.frame.size.height / 2    
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        super.layer.cornerRadius = super.frame.size.height / 2
        self.layer.cornerRadius = self.frame.size.height / 2
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        super.layer.cornerRadius = super.frame.size.height / 2
        self.layer.cornerRadius = self.frame.size.height / 2
    }
} 

而我在 Storyboard中的 imageView 是选择了 RoundedImageView 类。但在 Storyboard 中它仍然显示为矩形。我怎样才能意识到呢？当我运行代码时，它是四舍五入的。谢谢

Answer 1

您应该在应用布局之后设置半径。

@IBDesignable
class RoundedImageView: UIImageView {
    override init(image: UIImage?) {
        super.init(image: image)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        self.layer.cornerRadius = self.frame.size.height / 2
        self.clipsToBounds = true
    }
}