Question

我有一个集合视图，显示填满屏幕的水平单元格（它是一个iOS应用程序）。一些单元格有文本字段，如果用户点击＆＃34; next＆＃34;按钮集合视图进入下一个屏幕。键盘调整包含集合视图的视图的大小。所有这些都在导航控制器中。问题是，当键盘在屏幕上并且用户从导航控制器（推）接下来动画时，键盘消除重叠。这使得下一个视图显示在屏幕的顶部（就像键盘仍在那里）。

这是调整视图大小的代码：

-(void)keyboardWillShow:(NSNotification*)notification {

    NSDictionary *info = [notification userInfo];

    NSValue *keyboardFrameValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationCurve animationCurve = [info[UIKeyboardAnimationCurveUserInfoKey] integerValue];

    CGRect keyboardFrame = [keyboardFrameValue CGRectValue];
    BOOL isPortrait = UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation);
    CGFloat keyboardHeight = isPortrait ? keyboardFrame.size.height : keyboardFrame.size.width;

    self.bottomConstraint.constant = -keyboardHeight;
    [self setNeedsUpdateConstraints];



    [UIView animateWithDuration:animationDuration delay:0.0 options:(animationCurve << 16) animations:^{
        NSLog(@"keyboard will show");
        [self layoutIfNeeded];
    } completion:NULL];

}



-(void)keyboardWillHide:(NSNotification*)notification {

    NSDictionary *info = [notification userInfo];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationCurve animationCurve = [info[UIKeyboardAnimationCurveUserInfoKey] integerValue];

    self.bottomConstraint.constant = 0;
    [self setNeedsUpdateConstraints];

    [UIView animateWithDuration:animationDuration delay:0.0 options:(animationCurve << 16) animations:^{
        NSLog(@"keyb will hide");


        [self layoutIfNeeded];
    } completion:^(BOOL finished) {
        if (finished) {
            [self layoutIfNeeded];
        }
    }];

}

有关如何解决此问题的任何想法？

Answer 1

这可以解决您的问题：

单击下一步按钮

：

        [collectionviewCell.textField resignFirstResponder];

Answer 2

尝试收听UIKeyboardWillChangeFrameNotification而不是UIKeyboardWillShowNotification和UIKeyboardWillHideNotification。您可以通过以下方式处理UIKeyboardWillChangeFrameNotification：

- (void)handleKeyboardWillChangeFrameNotification:(NSNotification *)notification {
    CGRect keyboardEndFrame = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    keyboardEndFrame = [self.view convertRect:keyboardEndFrame fromView:nil];
    UIViewAnimationCurve animationCurve = [[notification.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
    NSTimeInterval animationDuration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] integerValue];
    CGFloat keyboardHeight = self.view.bounds.size.height - keyboardEndFrame.origin.y;

    // Constraint animation.
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];
    self.bottomConstraint.constant = keyboardHeight;
    [self.view layoutIfNeeded];
    [UIView commitAnimations];
}

如果这没有帮助，您可以尝试避免使用GCD重叠动画。这是一个伪代码：

1）当用户点击下一个按钮时，强制当前的第一个响应者重新签名（你可以使用[self.view endEditing：YES]）

2）使用dispatch_async

在主线程上异步调度到下一个屏幕的转换

编辑：

您是在设备上还是在模拟器中进行测试？模拟器有一些与键盘显示/隐藏相关的错误。

导航控制器推送后视图的高度不正确

2 个答案: