Ios 未应用自定义UIView约束_Ios_Swift_Uiview_Constraints

Ios 未应用自定义UIView约束

ios swift uiview

Ios 未应用自定义UIView约束,ios,swift,uiview,constraints,Ios,Swift,Uiview,Constraints,我有以下自定义UIView： import UIKit class CustomView: UIView { // container view lazy var contView: UIView = { let cv = UIView() cv.backgroundColor = .gray cv.translatesAutoresizingMaskIntoConstraints = false cv.layer.cornerRadius =

我有以下自定义UIView：

import UIKit

class CustomView: UIView {

// container view
lazy var contView: UIView = {
    let cv = UIView()

    cv.backgroundColor = .gray      
    cv.translatesAutoresizingMaskIntoConstraints = false
    cv.layer.cornerRadius = 5     
    cv.layer.masksToBounds = true  
    cv.isUserInteractionEnabled = true

    return cv
}()

lazy var t: UIImageView = {
    let tt = UIImageView()

    tt.translatesAutoresizingMaskIntoConstraints = false
    tt.isUserInteractionEnabled = false
    tt.contentMode = .scaleAspectFill      

    tt.alpha = 0

    return tt
}()

let img: UIImageView = {
    let image = UIImageView()

    image.backgroundColor = .yellow       
    image.translatesAutoresizingMaskIntoConstraints = false
    image.contentMode = .scaleAspectFill        

    return image
}()

let ny: UITextView = {
    let info = UITextView()

    info.translatesAutoresizingMaskIntoConstraints = false
    info.backgroundColor = .blue
    info.text = "Some, Text"        
    info.textColor = .white

    return info
}()

func setupContView() {

    contView.addSubview(img)
    contView.addSubview(ny)
    img.addSubview(t)

    // UIViewAlertForUnsatisfiableConstraints error
    contView.widthAnchor.constraint(equalTo: self.widthAnchor, constant: -24).isActive = true
    contView.heightAnchor.constraint(equalTo: self.heightAnchor, constant: -200).isActive = true
    contView.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
    contView.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true


    t.centerXAnchor.constraint(equalTo: img.centerXAnchor).isActive = true
    t.centerYAnchor.constraint(equalTo: img.centerYAnchor).isActive = true

    img.centerXAnchor.constraint(equalTo: contView.centerXAnchor).isActive = true
    img.centerYAnchor.constraint(equalTo: contView.centerYAnchor).isActive = true
    img.widthAnchor.constraint(equalTo: contView.widthAnchor).isActive = true
    img.heightAnchor.constraint(equalTo: contView.heightAnchor).isActive = true

    ny.leftAnchor.constraint(equalTo: contView.leftAnchor).isActive = true
    ny.rightAnchor.constraint(equalTo: contView.rightAnchor).isActive = true
    ny.bottomAnchor.constraint(equalTo: contView.bottomAnchor).isActive = true
    ny.heightAnchor.constraint(equalToConstant: 50).isActive = true

}

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

    addSubview(contView)

    setupContView()
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
}

当我尝试在我的视图控制器中创建对这个

CustomView

对象的引用时，就像这样

var myCustomView = CustomView()

。。。不会应用任何约束，也不会显示任何内容。当我尝试在视图控制器中添加约束或将

CustomView

添加到中心

myCustomView

时，我会得到

unsatifiableconstraints

错误。当我在视图控制器中为它们添加颜色时，它们就会出现，但我已经在自定义UIView类中这样做了，所以它是多余的，并且会覆盖我所做的

我该怎么办？我希望能够创建自定义类的对象，并使它们看起来都一样，但是，我在

CustomView

类中创建的约束或自定义视图似乎没有任何作用。

我认为您需要为

设置

contView

约束，并且您还需要为

contView

设置约束，我认为您不需要

cv.layoutifneed（）

在您的

contView

声明中，这样做会给我

UIViewAlertforUnsatifiableConstraints

，就像我说的那样。那又怎样？请解释一下。我给出了三个建议，您尝试删除了

cv.layoutifneed（）

并添加了

cardView.widthAnchor.constraint（equalTo:self.widthAnchor，常量：-24）。isActive=true

这会产生错误请应用其他建议，然后我认为您的代码会工作，对

和

contView

应用约束我认为您需要对

设置

height

和

width