ios - 如何使用默认的 iOS7 UIAnimation 曲线

Question

iOS7 动画的行为方式与 iOS6 不同。他们似乎使用了不同的贝塞尔曲线。在 iOS6 使用一种“easeInOutSine”曲线的地方，iOS7 更多的是“easeInOutExpo”类型。( http://matthewlein.com/ceaser/ )

有没有办法使用这条曲线？我想在键盘打开/关闭时同步我的动画。

Answer 1

这是我的做法（至少在即将显示键盘时）

- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *keyboardAnimationDetail = [notification userInfo];
    UIViewAnimationCurve animationCurve = [keyboardAnimationDetail[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    CGFloat duration = [keyboardAnimationDetail[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    [UIView animateWithDuration:duration delay:0.0 options:(animationCurve << 16) animations:^{
        // Set the new properties to be animated here
    } completion:nil];
}

您像往常一样从键盘通知中获取动画曲线，并通过位移将其转换为动画选项。

Answer 2

Update, fixed in 7.1. No longer necessary.

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For whatever reason, the animation curve reported on keyboard dismissal is incorrect. It seems to actually be 6 << 16 instead of 7 << 17.

Here's what I do with UIKeyboardWillChangeFrameNotification to determine which animation curve to use.

NSDictionary *keyboardAnimationDetail = [notification userInfo];

CGRect keyboardEndFrameWindow = [keyboardAnimationDetail[UIKeyboardFrameEndUserInfoKey] CGRectValue];

double keyboardTransitionDuration  = [keyboardAnimationDetail[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

// gives incorrect value of 7 on dismissal
// UIViewAnimationCurve keyboardTransitionAnimationCurve  = [keyboardAnimationDetail[UIKeyboardAnimationCurveUserInfoKey] integerValue];

CGRect keyboardEndFrameView = [self.view convertRect:keyboardEndFrameWindow fromView:nil];

CGFloat newConstant = (self.view.frame.size.height - keyboardEndFrameView.origin.y);

[UIView animateWithDuration:keyboardTransitionDuration
                      delay:0.0f
                    options:newConstant == 0 ? (6 << 16) : (7 << 16)
                 animations:^{
                     self.tableView.contentInset = UIEdgeInsetsMake(self.tableView.contentInset.top, 0, self.view.frame.size.height - keyboardEndFrameView.origin.y + self.commentToolbar.frame.size.height, 0);
                     self.tableView.scrollIndicatorInsets = UIEdgeInsetsMake(self.tableView.scrollIndicatorInsets.top, 0, self.view.frame.size.height - keyboardEndFrameView.origin.y + self.commentToolbar.frame.size.height, 0);
                     self.commentViewToSuperviewBottomConstraint.constant = (self.view.frame.size.height - keyboardEndFrameView.origin.y);
                     [self.view layoutIfNeeded];
                 }
                 completion:^(__unused BOOL finished){
                 }];

Basically I determine if the keyboard frame is hiding by seeing if the new y origin will be just outside our view's frame (newConstant). Then based on that I use either 6 or 7:

newConstant == 0 ? (6 << 16) : (7 << 16)

The rest is just adjusting my tableView contentInset and scrollIndicatorInsets, as well as changing the constant on the toolbar that is moving with the keyboard.