iOS编程：UITextField，监听非焦点事件

-(void)textFieldLostFocus{
    //do some work here... 
}

viewDidLoad

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldLostFocus) 
                                                 name:@"TextFieldDidLoseFocus" object:nil];

-(void)viewDidDisappear:(BOOL)animated{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"TextFieldDidLoseFocus" object:self userInfo:nil];
}

textFieldDidEndEditing: