Question

是否存在最新的快速解决方案，使UITextField占位符消失，或者在用户单击字段时将光标置于前面，而不是在他们开始键入时。我尝试了旧帖子中的一些解决方案，我尝试了下面的代码，但它似乎没有达到预期的效果。任何帮助非常感谢。

class LogInViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var userTextField: UITextField! 
// the placeholder text is set in IB, with clear Button set to Appears while editing, and clear when editing begins button checked. 

func textFieldDidBeginEditing(textField: UITextField) {
    userTextField.placeholder = nil
    passwordTextField.placeholder = nil
}
}

这对我有用：

添加userTextField.delegate = self以查看是否加载。 //谢谢我错过了

 func textFieldDidBeginEditing(textField: UITextField) {

    if userTextField.isFirstResponder() == true {
        userTextField.placeholder = nil
    }
}

Answer 1

如果您有多个TextField

1）将String变量添加到您的班级

class YourViewController : UIViewController {

    var placeHolder = ""

2）添加UITextFieldDelegate

extension YourViewController : UITextFieldDelegate {

func textFieldDidBeginEditing(_ textField: UITextField) {
    placeHolder = textField.placeholder ?? ""
    textField.placeholder = ""
}

func textFieldDidEndEditing(_ textField: UITextField) {
    if textField.placeholder == ""{
    textField.placeholder = placeHolder
    }
}

Answer 2

首先要确保从storyboard设置文本字段的委托或在viewDidLoad（）

中设置它

将代码更改为

userTextField.placeholder = ""
passwordTextField.placeholder = ""

Answer 3

在Swift 3中

func textFieldDidBeginEditing(_ textField: UITextField) {
    if loginTextField.isFirstResponder == true {
        loginTextField.placeholder = ""
    }
}

Answer 4

如果您想要一个不可见的占位符（例如，创建自己的自定义文本字段），则可以覆盖此方法：

public override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
        return .zero
}

Answer 5

创建UITextField的子类：

class CustomTextField: UITextField {

    private var placeholderBackup: String?

    override func becomeFirstResponder() -> Bool {
        placeholderBackup = placeholder
        placeholder = nil
        return super.becomeFirstResponder()
    }

    override func resignFirstResponder() -> Bool {
        placeholder = placeholderBackup
        return super.resignFirstResponder()
    }
}

当点击swift时，UITextField会隐藏占位符文本或将光标置于前面

5 个答案: