无法获取UITextField自动收缩字体 [英] Can't get UITextField to autoshrink the font

问题描述

在Swift中，我在表视图单元格上有一个 UITextField ，当文本太长时，我希望减小字体大小.我要说的很清楚，我在谈论的是UITextField，而不是UILabel或UITextView.我之所以这样说，是因为我已经多次看到这个问题，并且答案都基于UILabel而不是UITextField.

In Swift, i have a UITextField on a table view cell, and when it's text becomes too long I would like the font size to decrease. I want to make it very clear that I am talking about a UITextField, not a UILabel or a UITextView. The reason I say this is because I have seen this question pop up several times and the answers were all based on UILabel instead of UITextField.

我希望可以在IB中做到这一点，在这里我进行了最小字体大小的设置并正好适合，但这并没有改变任何东西:

I hoped, that can be done in IB, where i did this settinngs of Min Font Size and ajust to fit, but this didn´t change anything:

还有其他解决方法吗?

推荐答案

extension UITextField {
  internal func resizeText() {
    if let text = self.text{
      self.font = UIFont.systemFontOfSize(14)
      let textString = text as NSString
      var widthOfText = textString.sizeWithAttributes([NSFontAttributeName : self.font!]).width
      var widthOfFrame = self.frame.size.width
      // decrease font size until it fits
      while widthOfFrame - 5 < widthOfText {
        let fontSize = self.font!.pointSize
        self.font = self.font?.fontWithSize(fontSize - 0.5)
        widthOfText = textString.sizeWithAttributes([NSFontAttributeName : self.font!]).width
        widthOfFrame = self.frame.size.width
      }
    }
  }
}

根据我链接的答案，我创建了UITextField的扩展名，该扩展名会自动调整文本的大小-为使其每次都能正确调整文本的大小，需要在多个位置调用它:

Based on the answer I linked, I created an extension to UITextField that automatically resizes text - to have it properly resize the text each time, it needs to be called in a number of locations:

• override func drawRect(rect: CGRect)(我没有找到更好的地方来调用它，因为您必须等待其界限被设置并且TVC生命周期变得混乱为止)

• override func drawRect(rect: CGRect) (I haven't found a better spot to call this as you have to wait until its bounds are set and the TVC lifecycle gets confusing)

textField(textField: UITextField, shouldChangeCharactersInRange...

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