ios --- 动态获取键盘高度

需要手动调用 registerForKeyboardNotifications 方法，其他两个会自动调用，弹出的键盘高 216(输入英文时候)，ios 5 系统的

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    [self registerForKeyboardNotifications];

    UITextView *tv = [[UITextView alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];

    [self.view addSubview:tv];

    [tv release];

}

- (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;

    

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end