1. UITextFieldDelegate的代理

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 {

}