ios - 如果文本是单个单词，UITextField adjustmentFontSizeToFitWidth 不起作用

Question

我有一个 UITextField，它位于具有约束的特定 View 中。如果文本不是一个单词，它就可以完美地工作。但正如您在上图中看到的，如果文本只有一个单词，它不会调整字体大小以适应。我该如何解决？这是我的代码:

class ViewController: UIViewController {

    @IBOutlet weak var myView: UIView!

    lazy var textInput : UITextField = {
        let textInput = UITextField()
        textInput.textAlignment = .center
        textInput.translatesAutoresizingMaskIntoConstraints = false
        textInput.minimumFontSize = 10;
        textInput.adjustsFontSizeToFitWidth = true;
        textInput.backgroundColor = .yellow
        myView.addSubview(textInput)
        var lConst = NSLayoutConstraint(item: textInput, attribute: .leading, relatedBy: .equal, toItem: myView, attribute: .leading, multiplier: 1, constant: 0)
        var toConst = NSLayoutConstraint(item: textInput, attribute: .top, relatedBy: .equal, toItem: myView, attribute: .top, multiplier: 1, constant: 0)
        var trConst = NSLayoutConstraint(item: textInput, attribute: .trailing, relatedBy: .equal, toItem: myView, attribute: .trailing, multiplier: 1, constant: 0)
        var bConst = NSLayoutConstraint(item: textInput, attribute: .bottom, relatedBy: .equal, toItem: myView, attribute: .bottom, multiplier: 1, constant: 0)
        NSLayoutConstraint.activate([lConst,toConst,trConst,bConst])

        return textInput
    } ()


    override func viewDidLoad() {
        super.viewDidLoad()
        _ = textInput
        textInput.font = UIFont.boldSystemFont(ofSize: 200)
        // Do any additional setup after loading the view.
    }
}

Answer 1

如果您的意思是“字符”而不是“单词”(查看您的图像)，我认为您的问题是，默认情况下第一个字符是大写的。如果您想以小写字符开始文本，则必须设置:

textInput.autocapitalizationType = .none

编辑:抱歉，我只是误解了您的图像，并且没有看到您的信件在顶部和底部被剪切。

我用稍微不同的布局语法编写了您的代码，即使 View 小于您的字体大小，它也能正常工作。

class ViewController: UIViewController {

lazy var myView:UIView = {
    let view = UIView()
    view.translatesAutoresizingMaskIntoConstraints = false
    return view
}()

lazy var textInput : UITextField = {
    let textInput = UITextField()
    textInput.textAlignment = .center
    textInput.translatesAutoresizingMaskIntoConstraints = false
    textInput.minimumFontSize = 10;
    textInput.adjustsFontSizeToFitWidth = true;
    textInput.backgroundColor = .yellow
    return textInput
} ()


override func viewDidLoad() {
    super.viewDidLoad()
    setupLayout()
    // Do any additional setup after loading the view.
}

func setupLayout(){
    view.addSubview(myView)
    NSLayoutConstraint.activate([
        myView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
        myView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
        myView.widthAnchor.constraint(equalToConstant: 180),
        myView.heightAnchor.constraint(equalToConstant: 180)
    ])
    textInput.font = UIFont.boldSystemFont(ofSize: 200)
    myView.addSubview(textInput)
    NSLayoutConstraint.activate([
        textInput.topAnchor.constraint(equalTo:myView.topAnchor),
        textInput.trailingAnchor.constraint(equalTo: myView.trailingAnchor),
        textInput.bottomAnchor.constraint(equalTo: myView.bottomAnchor),
        textInput.leadingAnchor.constraint(equalTo: myView.leadingAnchor)
    ])
}
}