ios - Swift:使用多个文本字段时不调用 textFieldShouldReturn

Question

使用多个 textField 时，不会调用

textFieldShouldReturn。 textFields 设置为数字键盘，它们应将用户输入保存到变量 textFieldEntry，但当用户点击时不会调用 textFieldShouldReturn textField 的。

class TestViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var textFieldOne: UITextField!
@IBOutlet weak var textFieldTwo: UITextField!
@IBOutlet weak var textFieldThree: UITextField!
@IBOutlet weak var textFieldFour: UITextField!

var textFieldEntry: Int?

override func viewDidLoad() {
    super.viewDidLoad()
    //Looks for single or multiple taps.
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissKeyboard")

    // does not recognise tap when inside view
    tap.cancelsTouchesInView = false

    view.addGestureRecognizer(tap)

    self.textFieldOne.delegate = self
    self.textFieldTwo.delegate = self
    self.textFieldThree.delegate = self
    self.textFieldFour.delegate = self
}

 func dismissKeyboard() {
//Causes the view (or one of its embedded text fields) to resign the first responder status.
var firstResponder = findActiveResponderFrame(view: view)

var testVar: Int?
if firstResponder!.tag == 0 {
    testVar = Int(textFieldOne.text!)
    print(testVar)
} else if firstResponder!.tag == 1 {
    testVar = Int(textFieldTwo.text!)
    print(testVar)
} else if firstResponder!.tag == 2 {
    testVar = Int(textFieldThree.text!)
    print(testVar)
} else if firstResponder!.tag == 3 {
    testVar = Int(textFieldFour.text!)
    print(testVar)

}
view.endEditing(true)
}


func findActiveResponderFrame(view:UIView)->UIView?{
    if view.isFirstResponder {
        return view
    } else {
        for sub in view.subviews {
            if let subView = sub as? UIView,
                let found = findActiveResponderFrame(view: subView){
                return found
            }
        }
    }
    return nil
}

Answer 1

仅当用户在文本字段为第一响应者时键入 return 时，才会调用 should return 委托(delegate)方法。您添加了一个以编程方式结束编辑的点击手势 - 这不会调用任何委托(delegate)方法。

您需要重构您的逻辑，并找到调用 dismissKeyboard 时哪个文本字段是第一响应者，然后获取值。