Swift 3：通过遍历视图数组来设置视图

Posted 2023-03-14

【中文标题】Swift 3：通过遍历视图数组来设置视图

【英文标题】：Swift 3 : Setting a view by iterating through an array of views

【发布时间】：2017-05-08 09:47:02

【问题描述】：

我有四个 UIView 对象，它们最初是可选的。然后，当我加载视图时，它们被放入一个数组并在一个 for 循环中，它们中的每一个都被分配了一个 UIStackView。但是当我检查对象的全局实例是否等于数组中的一个时，它不是。我现在真的很困惑。

//global

@IBOutlet weak var buttonA: UIButton!
@IBOutlet weak var buttonB: UIButton!
@IBOutlet weak var buttonC: UIButton!
@IBOutlet weak var buttonD: UIButton!
var answerAView: UIView?
var answerBView: UIView?
var answerCView: UIView?
var answerDView: UIView?

override func viewDidLoad() 
    var answersViews = [self.answerAView, self.answerBView, self.answerCView, self.answerDView]
    var buttons = [buttonA, buttonB, buttonC, buttonD]
    var answers = ["A", "B", "C", "D"]
    var count = 0
    for a in answers 
        let newStack = UIStackView()
        newStack.axis = .vertical
        let label = UILabel()
        label.textColor = UIColor.black
        label.text = a
        label.lineBreakMode = .byWordWrapping
        label.numberOfLines = 0
        newStack.addArrangedSubview(label)

        newStack.distribution = .fillEqually
        newStack.spacing = 10
        NSLayoutConstraint(item: buttons[count], attribute: .width, relatedBy: .equal, toItem: rows[count], attribute:.width, multiplier: 0.15, constant:0.0).isActive = true
        answersViews[count] = newStack
        if answerAView == answersViews[count] 
            print("Settkekasldfjkskdjblvkjbalkvbksjbvb")//this does not print  
        
        count += 1
    

【问题讨论】：

似乎您的代码在语法方面几乎没有错误...请发布完整的源代码..它会有所帮助

【参考方案1】：

也许你应该写如下

//global
    var answerAView: UIView?
    var answerBView: UIView?
    var answerCView: UIView?
    var answerDView: UIView?

    //inside viewDidLoad
    var answersViews = [answerAView, answerBView, answerCView, answerDView]

    for view in answersViews 
        let stackView = UIStackView()
        stackView.addSubview(view)
        print("success")
    

【讨论】：

我更新了代码，你可以看到我需要uiview变成stack view

你写的代码“answersViews[count] = newStack”是错误的

为什么当我使用@IBOutlet weak var answerA: UITextView 时它会起作用？如 answerAview = answerA.