在 keyboardWillShow 中同步动画 keyboardWillHide -- 硬件键盘和虚拟键盘同时进行

Question

序言

所以我有一个具有聊天部分的应用程序，我正在将键盘隐藏和显示的动画与聊天输入的上升和下降同步。

这是我正在使用的代码：

显示：

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

    NSDictionary *keyboardAnimationDetail = [note userInfo];
    UIViewAnimationCurve animationCurve = [keyboardAnimationDetail[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    CGFloat duration = [keyboardAnimationDetail[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    NSValue* keyboardFrameBegin = [keyboardAnimationDetail valueForKey:UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

    // working for hardware keyboard
    //UIViewAnimationOptions options = (UIViewAnimationOptions)animationCurve;

    // working for virtual keyboard
    UIViewAnimationOptions options = (animationCurve << 16);

    [UIView animateWithDuration:duration delay:0.0 options:options animations:^{
        textView.frame = CGRectMake(0, self.view.bounds.size.height - keyboardFrameBeginRect.size.height, self.view.bounds.size.width, -40);
    } completion:nil];

}

隐藏：

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

    NSDictionary *keyboardAnimationDetail = [note userInfo];
    UIViewAnimationCurve animationCurve = [keyboardAnimationDetail[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    CGFloat duration = [keyboardAnimationDetail[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    // hardware keyboard
    //UIViewAnimationOptions options = (UIViewAnimationOptions)animationCurve;

    // virtual keyboard
    UIViewAnimationOptions options = (animationCurve << 16);

    [UIView animateWithDuration:duration delay:0.0 options:options animations:^{
        textView.frame = CGRectMake(0, self.view.bounds.size.height, self.view.bounds.size.width, -40);
    } completion:nil];

}

这适用于虚拟键盘，但如果由于断开或连接硬件键盘而调用了 keyboardWillShow: 或 keyboardWillHide:，则动画会滞后。我可以通过更改 UIViewAnimationOptions 来解决这个问题

替换：

// Works with virtual keyboard
UIViewAnimationOptions options = (animationCurve << 16);

与：

// working for firstResponder keyboard
UIViewAnimationOptions options = (UIViewAnimationOptions)animationCurve;

但是有了这个，现在 virtualKeyboard 动画就会滞后

我意识到硬件键盘动画不是很常见，它可能不是最重要的问题，但我喜欢一切正常工作！

例子

VirtualKeyboard w/ (animationCurve

VirtualKeyboard w/ (UIViewAnimationOptions)animationCurve -- BROKEN

HardwareKeyboard w/ (animationCurve

HardwareKeyboard w/ (UIViewAnimationOptions)animationCurve -- 工作

注释

在模拟器中模拟硬件键盘 cmd + shft + k

是的，这可以在真实设备上复制。

如果您需要，这里是我的其余代码，仅用于复制目的

添加文本视图

textView = [UITextView new];
textView.layer.borderWidth = 10;
textView.layer.borderColor = [UIColor blackColor].CGColor;
textView.frame = CGRectMake(0, self.view.bounds.size.height, self.view.bounds.size.width, -40);
[self.view addSubview:textView];

UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc]init];
[tap addTarget:self action:@selector(handleTap:)];
[self.view addGestureRecognizer:tap];

// OBSERVE KEYBOARD
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillHide:)
                                             name:UIKeyboardWillHideNotification
                                           object:nil];

手柄点击：

- (void) handleTap:(UITapGestureRecognizer *)tap {
    NSLog(@"tapped");
    [textView resignFirstResponder];
}

问题：

这里发生了什么，有没有一种无论虚拟/硬件键盘如何都能获得一致动画的好方法？

我知道这很长，感谢您的阅读！

Answer 1

由于苹果在键盘通知中给你发送的动画曲线没有对应的 UIViewAnimationOption 位，所以你需要下拉到老式的非块动画，直接使用曲线：

NSTimeInterval duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [note.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
[UIView beginAnimations:@"SomeAnimationID" context:NULL];
[UIView setAnimationCurve:curve];
[UIView setAnimationDuration:duration];
// Animation code
[UIView commitAnimations];

Answer 2

keyboardWillShow：

NSDictionary *info = [notification userInfo];
CGRect keyboardFrame = [info[UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
UIViewAnimationCurve curve = [info[UIKeyboardAnimationCurveUserInfoKey] integerValue];

[self layoutIfNeeded];
[UIView animateWithDuration:duration delay:0 options:(curve << 20) animations:^{
    [self.keyboardConstraint setConstant:keyboardFrame.size.height];
    [self layoutIfNeeded];
} completion:nil];