ios - 在 iOS8 上显示键盘时停用 View moveUp

Question

在我的应用程序中，我有一个注册表单，其中包含一些文本字段(电子邮件、密码等...)，当我开始在这些文本字段中的某处键入内容时(显示键盘)，我的 View 向上移动，然后我'我看不到我的文本字段中输入的内容。

此问题仅在 iOS8 上出现。

如果有人知道如何阻止此操作系统功能，我将不胜感激。

问候。

Answer 1

这是我用于管理与键盘出现和消失相关的问题的代码。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self registerForKeyboardNotifications];
} 

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

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

}

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

    //to overcome the bug with keyboard height for os7 and earlier
    if (![UIDeviceHardware isOS8Device]) {
        CGRect kbRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
        kbRect = [self.view convertRect:kbRect fromView:nil];
        kbSize = kbRect.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) ) {
        [_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;
}

您可以从 UITextfield Delegate 中选择 activeField。