Question

我有一个UITextView，我实现了一个keyboardWasShownMethod，如下所示：

(void)keyboardWasShown:(NSNotification*)aNotification {
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect bkgndRect = inkTextField.superview.frame;
    bkgndRect.size.height += kbSize.height;
    [inkTextField.superview setFrame:bkgndRect];
    [inkScroller setContentOffset:CGPointMake(0.0, inkTextField.frame.origin.y-kbSize.height) animated:YES];
     inkTextField.frame=CGRectMake(1, -5, 285, 221);
    NSLog(@"Called keyBoardWasShwon");
}

但由于某种原因，当我的键盘出现时它不会被调用。此方法与UITextView位于同一类中，UITextView在.h文件中声明并在XIB中连接。可能是什么原因造成的？

Answer 1

您是否为 UIKeyboardWillShowNotification 添加了观察者？

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

Answer 2

原来是因为我的代码中没有这些：

-(void) viewWillAppear: (BOOL)animated
{
    [super viewWillAppear:animated];

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self selector:@selector(keyboardWasShown:) name: UIKeyboardWillShowNotification object:nil];
    [nc addObserver:self selector:@selector(keyboardWasHidden:) name: UIKeyboardWillHideNotification object:nil];

}



- (void) viewWillDisappear: (BOOL)animated{

    [super viewWillDisappear:animated];

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc removeObserver:self name: UIKeyboardWillShowNotification object:nil];
    [nc removeObserver:self name: UIKeyboardWillHideNotification object:nil];
}

我的UITextView上没有调用keyboardWasShown方法

2 个答案: