无法在UIStackView中设置程序化布局约束 [英] Cannot Set Programmatic Layout Constraints in UIStackView

问题描述

我试图将通过情节提要创建的UIStackView中的单选按钮居中。但是，单选按钮是根据Firebase中的数据以编程方式在UIStackView中创建的。

我正在使用

基于Firebase数据添加单选按钮的代码：

 `
 pollRef.observe（FIRDataEventType.value，with：{（
中的快照）self.numberOfChildren = Int（snapshot.childSnapshot（forPath： answers）。childrenCount）
 self .passLabel.text =字符串（self.numberOfChildren）
打印（self.numberOfChildren）
 
 var按钮= [DLRadioButton]（）
 
对于x in 0。 。< self.numberOfChildren {
让answerLabel = snapshot.childSnaps hot（forPath： answers）。childSnapshot（forPath：String（x + 1））。childSnapshot（forPath： answer）。value 
让firstRadioButton = self.createRadioButton（frame：CGRect（x：1， y：1，宽度：80.0，高度：1.0），标题：answerLabel as！字符串，颜色：UIColor.black）
 firstRadioButton.tag = x 
 firstRadioButton.translatesAutoresizingMaskIntoConstraints = false 
buttons.append（firstRadioButton）
让页边距= self.radioStackView.layoutMarginsGuide 
 firstRadioButton.topAnchor.constraint（equalTo：margins.topAnchor，常数：5）.isActive = true 
 self.radioStackView.addArrangedSubview（firstRadioButton）
} 
 
 
 let groupButtons = DLRadioButton（）
 groupButtons.otherButtons =按钮
}）
 
 
 
} 
 
覆盖func didReceiveMemoryWarning （）{
 super.didReceiveMemoryWarning（）
 //处理所有可以重新创建的资源。 
} 
  

`
输出：按钮不直接堆叠在彼此之上;尝试与界面生成器一起使用，但仍然无法删除间距

解决方案

要在 stackView 中堆叠视图，您需要使用 addArrangedSubview

  self.radioStackView.addArrangedSubview（firstRadioButton）
  

I am trying to center radiobuttons in UIStackView that I have created via the storyboard. However, the radiobuttons are created within the UIStackView programmatically based on data in Firebase.

I am using the library offered at DLRadioButtons.

UIStackView below Label, named radioStackView:

Code where Radio Buttons are added based on Firebase Data:

  `
    pollRef.observe(FIRDataEventType.value, with: {(snapshot) in
    self.numberOfChildren = Int(snapshot.childSnapshot(forPath: "answers").childrenCount)
    self.passLabel.text = String(self.numberOfChildren)
    print(self.numberOfChildren)

    var buttons = [DLRadioButton]()

      for x in 0..<self.numberOfChildren {
    let answerLabel = snapshot.childSnapshot(forPath: "answers").childSnapshot(forPath: String(x+1)).childSnapshot(forPath: "answer").value
    let firstRadioButton = self.createRadioButton(frame: CGRect(x: 1, y:1 , width: 80.0, height: 1.0), title: answerLabel as! String, color: UIColor.black)
        firstRadioButton.tag = x
        firstRadioButton.translatesAutoresizingMaskIntoConstraints = false
        buttons.append(firstRadioButton)
        let margins = self.radioStackView.layoutMarginsGuide
        firstRadioButton.topAnchor.constraint(equalTo: margins.topAnchor, constant: 5).isActive = true
        self.radioStackView.addArrangedSubview(firstRadioButton)
        }


    let groupButtons = DLRadioButton()
    groupButtons.otherButtons = buttons
    })



}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

` Output: Buttons not stacking directly on top of each other; tried playing with interface builder but still unable to remove spacing

解决方案

To stack views in a stackView you need to use addArrangedSubview

self.radioStackView.addArrangedSubview(firstRadioButton)

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