关于UITextField中，监听UITextField文字内容发生变化的话
之前知道有个：
shouldChangeCharactersInRange
以及编辑完毕后的：textFieldDidEndEditing
但是现在有个问题：
对于shouldChangeCharactersInRange
中，调用其他update函数去判断输入内容是否合法：
func textFieldDidEndEditing(textField: UITextField) {
gLog.verbose("textField=\(textField)")
updateButtons()
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
var allow = true
gLog.verbose("textField=\(textField), range=\(range), string=\(string)")
let inputText = textField.text ?? ""
let updatedStr:String = (inputText as NSString).stringByReplacingCharactersInRange(range, withString: string)
gLog.verbose("updatedStr=\(updatedStr)")
if textField == self.registerView.shop4SCodeTextField {
allow = true
} else if textField == self.registerView.smsCodeTextField {
if updatedStr.characters.count > LoginRegisterSmsCodeLength {
gLog.verbose("exceed max sms code length \(LoginRegisterSmsCodeLength)")
allow = false
}
} else if (textField == self.registerView.phoneTextField) || (textField == self.loginView.phoneTextField) {
if updatedStr.characters.count > LoginRegsiterPhoneLength {
gLog.verbose("exceed max phone number length \(LoginRegsiterPhoneLength)")
allow = false
}
} else if (textField == self.registerView.passwordTextField) || (textField == self.loginView.passwordTextField) {
if updatedStr.characters.count > LoginRegisterPasswordLengthMax {
gLog.verbose("exceed max password length \(LoginRegisterPasswordLengthMax)")
allow = false
}
}
gLog.verbose("allow=\(allow)")
if allow {
updateButtons()
}
return allow
}
但是此时在
updateButtons
中去判断文本内容时发现：
其实新输入的内容，textfield还无法得到
－》即shouldChangeCharactersInRange返回之前，textfield中的text还是之前旧的值
－》没法很方便的判断，内容变化后，再去验证是否合法
搜：
swift uitextfield text change
swift uitextfield text changed
ios – How do I check when a UITextField changes? – Stack Overflow
UIControlEvents.EditingChanged
才是我所需要的
ios – UITextField text change event – Stack Overflow
variables – UITextField Changes Not Being Detected? – Stack Overflow
textfield – IOS 7 – Detect change in a text field – Stack Overflow
去添加对应代码：
self.loginView.phoneTextField.addTarget(self, action: #selector(self.textFiledEditingChanged(_:)), forControlEvents: UIControlEvents.EditingChanged)
self.loginView.passwordTextField.addTarget(self, action: #selector(self.textFiledEditingChanged(_:)), forControlEvents: UIControlEvents.EditingChanged)
func textFiledEditingChanged(textField: UITextField) {
gLog.verbose("textField=\(textField), textField.text=\(textField.text)")
updateButtons()
}
即可实现对应的效果：
当输入手机号不是11位，非法时，登录按钮立刻就失效了，无法点击了：
转载请注明：在路上 » ［已解决］swift中监听UITextField的文字内容发生变化