文本在文本字段中不可见(Text not visible in text field)

文本在文本字段中不可见(Text not visible in text field)

我的导航栏中有一个按钮，当按下该按钮时，会调用一个函数（showAddItemtextField），该函数在导航栏中将文本字段显示为titleView。

navigationItem.leftBarButtonItem = UIBarButtonItem(title: "+", style: .plain, target: self, action: #selector(showAddItemTextField))

到目前为止还可以，我可以在文本字段中键入文本（我知道因为当我点击文本字段时占位符文本消失，当我输入时我得到自动完成建议），但我键入的文本是不可见的。

到目前为止，这是我的代码：

// Show text field upon add button press lazy var addItemTextField: UITextField = { let textField = UITextField() textField.placeholder = "Add a new item..." return textField }() func showAddItemTextField() { self.navigationItem.titleView = addItemTextField }

我不确定问题是否是因为新的文本字段，作为navigationItem.titleView，通常存在（navigationItem.title）。 当文本字段存在时，我是否必须隐藏navigationItem.title？ 或者是一个不同的问题？

我还应该补充一点，当我点击文本字段时，屏幕键盘不会出现。

I have a button in my navigation bar which, when pressed, calls a function (showAddItemtextField) that shows a text field as a titleView in the navigation bar.

navigationItem.leftBarButtonItem = UIBarButtonItem(title: "+", style: .plain, target: self, action: #selector(showAddItemTextField))

That much is ok so far, and I can type text into the text field (I know because when I tap on the text field the placeholder text disappears, and when I type I get autocomplete suggestions), but the text I type is otherwise invisible.

Here's my code so far:

// Show text field upon add button press lazy var addItemTextField: UITextField = { let textField = UITextField() textField.placeholder = "Add a new item..." return textField }() func showAddItemTextField() { self.navigationItem.titleView = addItemTextField }

I'm not sure if the issue is because the new text field, as a navigationItem.titleView, goes on top of what is usually there (navigationItem.title). Do I have to hide navigationItem.title when the text field is present? Or is a different problem?

I should also add that the onscreen keyboard does not appear when I tap on the text field.

最满意答案

问题是您的文本字段没有大小。 当你创建它时，你没有给它一个大小，当你说：

let textField = UITextField()

然后你通过不必要的textField.translatesAutoresizingMaskIntoConstraints行来复杂化问题。

这对我来说很好：

let tf = UITextField(frame:CGRect(origin:.zero, size:CGSize(width:100, height:28))) tf.borderStyle = .bezel self.navigationItem.titleView = tf

我不是说那是你想要的尺寸/外观，但是它可以输入一个可见的文本字段。

The problem is that your text field has no size. You failed to give it a size when you created it, when you said:

let textField = UITextField()

Then you compounded the problem by the unnecessary textField.translatesAutoresizingMaskIntoConstraints line.

This works fine for me:

let tf = UITextField(frame:CGRect(origin:.zero, size:CGSize(width:100, height:28))) tf.borderStyle = .bezel self.navigationItem.titleView = tf

I'm not saying that that's the size / look you want, but it makes a visible text field you can type into.