ios - subview 的大小不等于它的父 View

Question

问题:

黄色部分是 subview ( subview 是UIImageView，父 View 是UIView。)，它的大小应该和它的父 View (灰色部分)一样，我应该怎么办做什么来解决这个问题？

屏幕图像:

代码如下:

var linkedMemory = Memory(masteryLevel: 1, algorithm: Algorithm.algorithm1.chooseAlgorithm(), forgetRatio: 0, lastStudyTime: Date(), front: #imageLiteral(resourceName: "Ideas-Yellow"), back: #imageLiteral(resourceName: "Ideas-Blue"))

var frontView: UIView {
    let front = showContent(of: linkedMemory.front)
    return front
}

convenience init(memory: Memory) {
    self.init(frame: CGRect())
    self.linkedMemory = memory
    self.setupView()
}

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

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

func setupView() {
    self.layer.cornerRadius = 20
    self.layer.shadowRadius = 12
    self.layer.shadowOpacity = 0.15
    self.layer.masksToBounds = true
    addGesture()
    sizeNAddSubview(view: frontView)
}

func sizeNAddSubview(view: UIView) {
    view.frame.size = self.bounds.size
    addSubview(view)
}

func showContent(of linkenMemory: Any) -> UIView {
    var contentView = UIView()
    if let content = linkenMemory as? UIImage {
        let imageView = UIImageView()
        imageView.image = content
        contentView = imageView
    }
    if let content = linkedMemory as? String {
        let label = UILabel()
        label.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
        label.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
        let text = content
        label.text = text
        contentView = label
    }
    return contentView
}

约束条件如下:

Answer 1

您可以将约束条件作为父 View 的等高和等宽[或者] 如果您在布局传递之前设置此 View ， super View 的大小将不是实际大小，因此您必须将代码移动到 viewDidAppear() 或 viewDidLayoutSubviews()