子视图的大小不等于其超级视图

Question

问题：

黄色部分是子视图（子视图是UIImageView，superview是UIView。），它的大小与其superview（灰色部分）相同，我应该怎么做要解决这个问题吗？

屏幕图片：

以下是代码：

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
}

以下是限制因素：

Answer 1

您可以将约束设置为相等的高度和相等的superview宽度 [要么]  如果您在布局通过之前设置此视图，则超级视图的大小将不是实际大小，因此您必须将代码移至viewDidAppear()或viewDidLayoutSubviews()

Answer 2

你的闪存卡视图是UIView.And你想全屏显示，然后按照这个。