无法将以编程方式创建的UITextField文本设置为UIPickerView值

Question

I've created a UITextField programmatically ( myTextField : UITextField! ) so I can easily control its attributes.

I want to be able to set its text to the selected value of a UIPicker (programmatically created via myPickerView: UIPickerView! = UIPickerView() ), but whenever I try myTextField.text = pickerData[row] inside didSelectRow the app crashes saying nil was found while unwrapping an Optional.

I'm using myTextField.inputView = myPickerView which behaves properly and I can successfully print out the selected row from the picker view. It's only when I try to set the text that it crashes.

When I set up a button on the storyboard as an IBOutlet it works properly, but I want to avoid using storyboard. Is there anyway around this? Or is it possible to style a storyboard button programmatically?

UPDATE: I've set a tag to myTextField and set myTextField.text using the tag under the pickers didSelect protocol, but that feels roundabout and hacky

Answer 1

Your textfield is nil. You need to initialize the textField before using the pickerView. Best method is

myTextField = UITextField()
myTextField.inputView = myPickerView

So that, the pickerView appears only when you touch the textField. If you want it to be open by default, use

myTextField.becomeFirstResponder()

Answer 2

我认为您在设置文本之前没有初始化文本字段。