获得键盘的代理方法

- (void)viewDidLoad {

[super viewDidLoad];

NSLog(@"%f", [[UIScreen mainScreen] bounds].size.height);

[self registerForKeyboardNotifications];

}

- (void) registerForKeyboardNotifications

{

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

[[NSNotificationCenter defaultCenter]  addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];

}

- (void) keyboardWasShown:(NSNotification *) notif

{

NSDictionary *info = [notif userInfo];

NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

CGSize keyboardSize = [value CGRectValue].size;

NSLog(@"keyBoard:%f", keyboardSize.height);  //216

///keyboardWasShown = YES;

}

- (void) keyboardWasHidden:(NSNotification *) notif

{

NSDictionary *info = [notif userInfo];

NSValue *value = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

CGSize keyboardSize = [value CGRectValue].size;

NSLog(@"keyboardWasHidden keyBoard:%f", keyboardSize.height);

// keyboardWasShown = NO;

}