向上移动UIToolbar

Question

我的视图底部有一个UIToolbar,我在这个工具栏中有一个UITextField.当我开始编辑这个字段时,它隐藏在键盘后面.要查看我输入的内容,我想在键盘出现时将工具栏向上移动(然后在我完成编辑后将其向下移动).

如何上/下移动此UIToolbar？

Answer 1

将viewController类添加到UIKeyboardWillShowNotification/ 的观察者列表中UIKeyboardWillHideNotification.然后您可以移动视图以使textView可见.您还可以从此通知中获取动画参数,以使您的动画与当前操作系统版本的键盘动画参数同步.我用这个代码进行分页

- (void) viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(liftMainViewWhenKeybordAppears:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(returnMainViewToInitialposition:) name:UIKeyboardWillHideNotification object:nil];
}
- (void) viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

在下面的方法中,我设置了两种方法来处理键盘通知.以下是这些方法:

- (void) liftMainViewWhenKeybordAppears:(NSNotification*)aNotification{
    NSDictionary* userInfo = [aNotification userInfo];
    NSTimeInterval animationDuration;
    UIViewAnimationCurve animationCurve;
    CGRect keyboardFrame;
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve];
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
    [[userInfo objectForKey:UIKeyboardBoundsUserInfoKey] getValue:&keyboardFrame];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];
    [self.view setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y - keyboardFrame.size.height, self.view.frame.size.width, self.view.frame.size.height)];
    [UIView commitAnimations];
}

- (void) returnMainViewToInitialposition:(NSNotification*)aNotification{
    NSDictionary* userInfo = [aNotification userInfo];
    NSTimeInterval animationDuration;
    UIViewAnimationCurve animationCurve;
    CGRect keyboardFrame;
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve];
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
    [[userInfo objectForKey:UIKeyboardBoundsUserInfoKey] getValue:&keyboardFrame];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];
    [self.view setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + keyboardFrame.size.height, self.view.frame.size.width, self.view.frame.size.height)];
    [UIView commitAnimations];
}

Answer 2

谢谢你的工作!这是一个小小的改进:

- (void) liftMainViewWhenKeybordAppears:(NSNotification*)aNotification{
    [self scrollViewForKeyboard:aNotification up:YES];
}

- (void) returnMainViewToInitialposition:(NSNotification*)aNotification{
    [self scrollViewForKeyboard:aNotification up:NO];
}

- (void) scrollViewForKeyboard:(NSNotification*)aNotification up: (BOOL) up{
    NSDictionary* userInfo = [aNotification userInfo];

    // Get animation info from userInfo
    NSTimeInterval animationDuration;
    UIViewAnimationCurve animationCurve;
    CGRect keyboardFrame;
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve];
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
    [[userInfo objectForKey:UIKeyboardBoundsUserInfoKey] getValue:&keyboardFrame];

    // Animate up or down
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];

    [self.view setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + (keyboardFrame.size.height * (up?-1:1)), self.view.frame.size.width, self.view.frame.size.height)];
    [UIView commitAnimations];
}

Answer 3

基于上面的答案并使用便捷方法[UIView animateWithDuration ...].观察将显示/隐藏键盘通知并使用这些处理程序.

- (void)keyboardWillShow:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    NSNumber *durationValue = info[UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curveValue = info[UIKeyboardAnimationCurveUserInfoKey];
    NSValue *endFrame = info[UIKeyboardFrameEndUserInfoKey];

    [UIView animateWithDuration:durationValue.doubleValue
                          delay:0
                        options:(curveValue.intValue << 16)
                     animations:^{
                         self.navigationController.toolbar.frame = CGRectMake(0,
                                                                              [endFrame CGRectValue].origin.y - self.navigationController.toolbar.bounds.size.height,
                                                                              self.navigationController.toolbar.bounds.size.width,
                                                                              self.navigationController.toolbar.bounds.size.height);
                     }
                     completion:nil];
}

- (void)keyboardWillHide:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    NSNumber *durationValue = info[UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curveValue = info[UIKeyboardAnimationCurveUserInfoKey];

    [UIView animateWithDuration:durationValue.doubleValue
                          delay:0
                        options:(curveValue.intValue << 16)
                     animations:^{
                         self.navigationController.toolbar.frame = CGRectMake(0,
                                                                              self.view.bounds.size.height - self.navigationController.toolbar.bounds.size.height,
                                                                              self.navigationController.toolbar.bounds.size.width,
                                                                              self.navigationController.toolbar.bounds.size.height);
                     }
                     completion:nil];
}