iOS 8 键盘隐藏了我的 TextView

Question

我有一个 UIViewController 使用 self.accountViewController.modalPresentationStyle = UIModalPresentationFormSheet; 呈现，现在在 iOS 8 中，最后一个 UITextView 被隐藏了键盘向上推时。如何避免？

Answer 1

@Oleg 的解决方案很好，但它没有考虑键盘大小的变化，而它已经显示了。此外，他对动画持续时间和其他一些参数进行了硬编码。请参阅下面的解决方案:

将 UIKeyboardWillChangeFrameNotification 的观察者添加到 viewDidLoad

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardFrameWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

然后添加方法:

- (void)keyboardFrameWillChange:(NSNotification *)notification
{
    CGRect keyboardEndFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect keyboardBeginFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    UIViewAnimationCurve animationCurve = [[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
    NSTimeInterval animationDuration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] integerValue];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];

    CGRect newFrame = self.view.frame;
    CGRect keyboardFrameEnd = [self.view convertRect:keyboardEndFrame toView:nil];
    CGRect keyboardFrameBegin = [self.view convertRect:keyboardBeginFrame toView:nil];

    newFrame.origin.y -= (keyboardFrameBegin.origin.y - keyboardFrameEnd.origin.y);
    self.view.frame = newFrame;

    [UIView commitAnimations];
}

不要忘记在 viewDidUnload 和 Dealloc 中移除键盘观察器。