ios - UIView 的框架属性未在 iOS 上的动画内部分配

Question

在我的 iOS 应用程序中，我尝试执行以下简单动画:

- (void)dismissToolbar
{


    NSLog(@"bx: %f by: %f bw: %f bh: %f ",
            toolbar.frame.origin.x,
            toolbar.frame.origin.y,
            toolbar.frame.size.width,
            toolbar.frame.size.height);

    CGRect tempRect = CGRectMake(0,
                                 toolbar.frame.origin.y + toolbar.frame.size.height,
                                 toolbar.frame.size.width,
                                 toolbar.frame.size.height);

    [UIView animateWithDuration:animationsDuration
                          delay:0
                        options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionAllowAnimatedContent
                     animations:^{
                         NSLog(@"bx: %f by: %f bw: %f bh: %f ",
                               tempRect.origin.x,
                               tempRect.origin.y,
                               tempRect.size.width,
                               tempRect.size.height);
                         toolbar.frame = tempRect;   // frame value doesn't change here!
                     }
                     completion:^(BOOL finished) {

                         NSLog(@"bx: %f by: %f bw: %f bh: %f ",
                               toolbar.frame.origin.x,
                               toolbar.frame.origin.y,
                               toolbar.frame.size.width,
                               toolbar.frame.size.height);
                         NSLog(@"dismiss toolbar complete");
                         [toolbar setHidden:YES];
                         isPlayerToolbarActive = NO;
                         isDissmissingToolbar = NO;
                     }
     ];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"animateSidePanels" object:@"removingPlayerToolbar"];
}

我从上面的日志中得到以下输出到控制台:

bx: 0.000000 by: 724.000000 bw: 1024.000000 bh: 44.000000

bx: 0.000000 by: 768.000000 bw: 1024.000000 bh: 44.000000

bx: 0.000000 by: 724.000000 bw: 1024.000000 bh: 44.000000

关闭工具栏完成

如你所见，框架的值没有改变......我真的不明白为什么......

非常感谢任何形式的帮助!

Answer 1

您是使用 xib 还是 interfaceBuilder 创建 View 的？

如果是这样，请尝试选择 xib 并取消选择使用 autoLayout