Obj-c - 返回原始状态时延迟动画？

Question

我正在使用以下代码在激活键盘时向上移动视图和表格视图。但是，当键盘关闭时，在键盘关闭到 return 到它原来的位置（另一方面，tableView 是即时的）之后，它需要 upView 稳定 2 秒。为什么会这样？

      - (void)viewDidLoad {
            [super viewDidLoad];

           [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillShowNotification object:nil];


        }

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


            NSDictionary* keyboardInfo = [notification userInfo];

            NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameEndUserInfoKey];

            CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

            UITabBarController *tabBarController = [UITabBarController new];
            CGFloat tabBarHeight = tabBarController.tabBar.frame.size.height;


            self.keyboardHeight = keyboardFrameBeginRect.size.height - tabBarHeight;

        }


        - (void) animateTextView:(BOOL) up
         {

                const int movementDistance = self.keyboardHeight;

                const float movementDuration = 0.2f;
                int movement= movement = (up ? -movementDistance : movementDistance);


                [UIView beginAnimations: @"anim" context: nil];
                [UIView setAnimationBeginsFromCurrentState: YES];
                [UIView setAnimationDuration: movementDuration];

                self.upView.frame = CGRectOffset(self.upView.frame, 0, movement);
                [UIView setAnimationDidStopSelector:@selector(afterAnimationStops)];
                [UIView commitAnimations];

                self.tableView.frame = CGRectOffset(self.tableView.frame, 0, movement);
                [UIView setAnimationDidStopSelector:@selector(afterAnimationStops)];
                [UIView commitAnimations];

        }

    - (void)textViewDidBeginEditing:(UITextView *)textView
    {

     [self animateTextView:YES];

    }

- (void)textViewDidEndEditing:(UITextView *)textView
{
    [self animateTextView:NO];
}

更新代码

.m

- (void)handleKeyboard:(NSNotification*)aNotification{
    NSDictionary* info = [aNotification userInfo];
    NSValue* value = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration = 3;
    [value getValue:&duration];
    if (aNotification.name == UIKeyboardWillHideNotification) {
        /** KEYBOARD HIDE **/

       [UIView animateWithDuration:0 animations:^{ self.upView.frame = CGRectOffset(self.upView.frame, 0, self.keyboardHeight); self.tableView.frame = CGRectOffset(self.tableView.frame, 0, self.keyboardHeight); } completion:^(BOOL finished) {}];


        [self moveCustomView:NO duration:duration];
        NSLog(@"CLOSED!");
    }

    if (aNotification.name == UIKeyboardWillShowNotification) {
        /** KEYBOARD SHOW **/

 [UIView animateWithDuration:0 animations:^{ self.upView.frame = CGRectOffset(self.upView.frame, 0, -self.keyboardHeight); self.tableView.frame = CGRectOffset(self.tableView.frame, 0, -self.keyboardHeight); } completion:^(BOOL finished) {}];


        [self moveCustomView:YES duration:duration];
    }
}

- (void)moveCustomView:(BOOL)move duration:(NSTimeInterval)time{

}

Answer 1

此问题可能与动画持续时间有关，因此您可以从 -(void)handleKeyboard:(NSNotification *)notification {}

获取键盘显示和隐藏动画持续时间

并在同一函数内处理显示和隐藏自定义视图。将以下代码添加到您的 viewDidLoad 函数

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

处理键盘操作和 UI 更改

- (void)handleKeyboard:(NSNotification*)aNotification{
    NSDictionary* info = [aNotification userInfo];
    NSValue* value = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration = 0;
    [value getValue:&duration];
    if (aNotification.name == UIKeyboardWillHideNotification) {
        /** KEYBOARD HIDE **/

        //calculate your view frames and handle UI changes
        /*
         .
         .
         .
         .
         .
         */
        [self moveCustomView:NO duration:duration];
    }

    if (aNotification.name == UIKeyboardWillShowNotification) {
        /** KEYBOARD SHOW **/

        //calculate your view frames and handle UI changes
        /*
         .
         .
         .
         .
         .
         */
        [self moveCustomView:YES duration:duration];
    }
}

- (void)moveCustomView:(BOOL)move duration:(NSTimeInterval)time{

}

Answer 2

我认为你需要使用线程来立即调用动画...

- (void)textViewDidBeginEditing:(UITextView *)textView {

    dispatch_async(dispatch_get_main_queue(), ^{
        [self animateTextView:YES];
    });
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    dispatch_async(dispatch_get_main_queue(), ^{
        [self animateTextView:NO];
    });
}

我不太了解你的问题，但试试这个，因为如果我们遇到这类问题，dispatch_async() 将解决。

Obj-c - 返回原始状态时延迟动画？

Obj-c - Delayed animation when returning to original state?

ios

objective-c

xcode

nsoperationqueue

uianimation