我正在处理我的项目中的自动完成,我想在textfieldDidChange值和调用方法(链接到API)500MS之后检测。Textfield didChange with timer
我希望它很清楚 感谢您的帮助!
我正在处理我的项目中的自动完成,我想在textfieldDidChange值和调用方法(链接到API)500MS之后检测。Textfield didChange with timer
我希望它很清楚 感谢您的帮助!
首先确保让你的类TextField的委托:
class yourClass: UIViewController, UITextFieldDelegate{
//...
}
然后在viewDidLoad()
:
textField.delegate = self
numbersTextField.addTarget(self, action: #selector(self.textFieldDidChange), for: .editingChanged)
之后,你可以用一个定时器,像这个:
var timer = Timer()
var count = 0
func textFieldDidChange(textField: UITextField){
timer.invalidate()
timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(self.timerFunc), userInfo: nil, repeats: true)
}
func timerFunc(){
count += 1
if count == 5{
timer.invalidate()
// do your things here down here, I assumed that your method is called autocomplete
autocomplete()
}
}
希望它有帮助!
在斯威夫特3,你可能要连接到“编辑而改变”,不是“价值化”,并复位定时器并开始另一个定时器:
weak var timer: Timer?
@IBAction func didChangeEditing(_ sender: UITextField) {
timer?.invalidate()
timer = .scheduledTimer(withTimeInterval: 0.5, repeats: false) { [weak self] timer in
// trigger your autocomplete
}
}
或者你可以挂接到shouldChangeCharactersIn
。例如:
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var textField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
textField.delegate = self // or you can do this in IB
}
weak var timer: Timer?
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
timer?.invalidate() // cancel prior timer, if any
timer = .scheduledTimer(withTimeInterval: 0.5, repeats: false) { [weak self] timer in
// trigger your autocomplete
}
return true
}
}
非常感谢!!!! –