Swift 文本字段随计时器而变化
我正在我的项目中进行自动完成,我想检测textfieldDidChange值的变化,并在500毫秒后调用一个方法(链接到API) 我希望足够清楚Swift 文本字段随计时器而变化,swift,api,autocomplete,uitextfield,Swift,Api,Autocomplete,Uitextfield,我正在我的项目中进行自动完成,我想检测textfieldDidChange值的变化,并在500毫秒后调用一个方法(链接到API) 我希望足够清楚 谢谢你的帮助 在Swift 3中,您可能希望连接到“编辑更改”而不是“值更改”,然后重置计时器并启动另一个计时器: weak var timer: Timer? @IBAction func didChangeEditing(_ sender: UITextField) { timer?.invalidate() timer = .s
谢谢你的帮助 在Swift 3中,您可能希望连接到“编辑更改”而不是“值更改”,然后重置计时器并启动另一个计时器:
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
}
}
或者您也可以挂接到中的shouldchangeCharacters。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
}
}
首先确保您的类是TextField的委托:
class yourClass: UIViewController, UITextFieldDelegate{
//...
}
然后在viewDidLoad()
中:
之后,您可以使用计时器,如下所示:
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()
}
}
希望有帮助
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()
}
}