如何在iOS5中顯示鍵盤隱藏的UIElements？

在iOS 5 iPad支持3種不同的鍵盤（普通，拆分，上移）。以前，當出現鍵盤時，控制器將通過KeyboardDidShowNotification進行通知。在這裏，如果我們有任何通過鍵盤隱藏的UI元素將設置偏移量並向上推動元素（通過使用滾動視圖）。在iOS 5中，我們必須根據鍵盤的類型進行處理。我們如何知道鍵盤類型。我們可以爲新的鍵盤類型做些什麼？如何在iOS5中顯示鍵盤隱藏的UIElements？

謝謝， durai。

來源

2011-10-21 durai

如果您在UIKeyboardWillShowNotification或UIKeyboardWillHideNotification反應，你應該罰款當「正常模式」顯示的鍵盤，他們只會被髮送。如果使用者拉動其向上或拆分它，您將收到一個UIKeyboardWillHideNotification（奇怪的行爲但蘋果的唯一選擇，使其向後兼容iOS 4的應用程序）

來源

2011-10-21 07:34:33

兼容。如果要滾動鍵盤下面自動隱藏的TextView或文本框元素時，點擊編輯文本元素上，下面的代碼將有助於您的ios5：

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

    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(keyboardWillBeHidden:) 
               name:UIKeyboardWillHideNotification object:nil]; 
} 

// Called when the UIKeyboardDidShowNotification is sent. 
- (void)keyboardWasShown:(NSNotification*)aNotification 
{ 
    NSDictionary* info = [aNotification userInfo]; 
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0); 
    _scrollView.contentInset = contentInsets; 
    _scrollView.scrollIndicatorInsets = contentInsets; 

    // If active text field is hidden by keyboard, scroll it so it's visible 
    // Your app might not need or want this behavior. 
    CGRect aRect = self.view.frame; 
    aRect.size.height -= kbSize.height; 
    if (!CGRectContainsPoint(aRect, _activeField.frame.origin)) { 
     [self.scrollView scrollRectToVisible:_activeField.frame animated:YES]; 
    } 
} 

// Called when the UIKeyboardWillHideNotification is sent 
- (void)keyboardWillBeHidden:(NSNotification*)aNotification 
{ 
    UIEdgeInsets contentInsets = UIEdgeInsetsZero; 
    _scrollView.contentInset = contentInsets; 
    _scrollView.scrollIndicatorInsets = contentInsets; 
} 

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{ 
    _activeField = textField; 
} 

- (void)textFieldDidEndEditing:(UITextField *)textField 
{ 
    _activeField = nil; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    // Do any additional setup after loading the view from its nib. 

    [self registerForKeyboardNotifications]; 
}

來源

2013-10-23 09:00:19

如何在iOS5中顯示鍵盤隱藏的UIElements？

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