从 UIStackView 中缺失的代码添加的 UITextView [英] UITextView added from code missing in UIStackView

问题描述

我正在尝试以编程方式将 UITextView 添加到 UIStackView，但它没有出现在屏幕上.

I'm trying to add a UITextView to UIStackView programatically, but it doesn't appear on the screen.

当我检查调试视图层次结构时，它位于视图层次结构中，并且有一些约束，但没有显示在输出视图中.

When I check in Debug View Hierarchy, it is in the view hierarchy and it has some constraints but doesn't show up in the outputted view.

这是我的代码:

let stackView = UIStackView()

let textView = UITextView()
let button = UIButton()

stackView.axis = .Horizontal
stackView.spacing = 20
stackView.distribution = UIStackViewDistribution.Fill

button.setImage(UIImage(named:"image1"), forState: .Normal)
button.setImage(UIImage(named:"image2"), forState: .Selected)


textView.textAlignment = NSTextAlignment.Left
textView.textColor = UIColor.blackColor()
textView.editable = true
textView.text = ""

stackView.addArrangedSubview(textView)
stackView.addArrangedSubview(button)

按钮添加得很好.但是我找不到正确显示 TextView 的方法！尝试添加如下所示的宽度/高度约束，但效果不佳或效果不佳(取决于变体):

Button is added fine. But I cannot find a way to show TextView correctly! Tried to add width/height constraints like below, but it doesn't work like, or work badly (depending on variant):

let widthConstraint = NSLayoutConstraint(item: textView,
                 attribute: NSLayoutAttribute.Width,
                 relatedBy: NSLayoutRelation.Equal,
                 toItem: stackView,
                 attribute: NSLayoutAttribute.Width,
                 multiplier: 1,
                 constant: 0)
stackView.addConstraint(widthConstraint)
let heightConstraint = NSLayoutConstraint(item: textView, attribute:   NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: stackView, attribute: NSLayoutAttribute.Height, multiplier: 1, constant: 0)
stackView.addConstraint(heightConstraint)

但是，当我添加 UITextField 而不是 UITextView 时，它可以正常工作，没有任何限制.

However, when I added a UITextField, not UITextView, then it's working fine without any constraints.

推荐答案

我发现缺少什么.我无法使用指定的初始化程序，因为我不知道我正在创建它的类中文本视图的框架大小.

I figured out what's missing. I can't use the designated initializer, because I don't know the frame size of the text view in the class I'm creating it in.

但这有帮助 - 在上面的代码中的 stackView.distribution 之后添加这一行:

But this helped - adding this line after stackView.distribution in the code above:

 self.alignment = UIStackViewAlignment.Fill

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