1. UITextFieldDelegate的代理
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开始输入的监听：
// return NO to disallow editing.
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField;
输入结束的监听：
- (void)textFieldDidEndEditing:(UITextField *)textField;
等等。在这些方法中，添加相应的操作。
2.获取UITextField输入内容
[self.accountText addTarget:self action:@selector(input:) forControlEvents:UIControlEventEditingChanged];
- (void) input:(UITextField*)textField {
}
3.监听键盘事件的通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardShow:)
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardHide:)
name:UIKeyboardDidHideNotification
object:nil];
- (void)keyboardWillShow:(NSNotification *)notif {
}
- (void)keyboardShow:(NSNotification *)notif {
}
- (void)keyboardWillHide:(NSNotification *)notif {
}
- (void)keyboardHide:(NSNotification *)notif {
}