objective-c - UIActivityIndi​​cator 没有动画

Question

- (void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    self.connectionIndicator = [[[UIActivityIndicatorView alloc]
                                initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray] autorelease];
    [self.view addSubview:connectionIndicator];

    [self.connectionIndicator setCenter:CGPointMake(self.view.frame.size.width/2, 15)];
    [connectionIndicator startAnimating];
}

微调器显示为卡住状态，并且没有开始动画。

编辑:好的，我找到了原因，但还没有找到解决方案。

这个 View Controller 通过页面 curl 转换被插入导航 Controller 堆栈:

ServerHandshakeViewController *shvc = [[ServerHandshakeViewController alloc] initWithHost:h];
[UIView  beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
[self.navigationController pushViewController:shvc animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.navigationController.view cache:NO];
[UIView commitAnimations];
[shvc release];

像下面这样删除上面的 curl 过渡解决了微调器卡住问题。

ServerHandshakeViewController *shvc = [[ServerHandshakeViewController alloc] initWithHost:h];
[self.navigationController pushViewController:shvc animated:NO];
[shvc release];

但是，如果我想保留 curl 页面过渡怎么办？

Answer 1

您可以尝试使用可以指定动画选项的 block 方法。 UIViewAnimationOptionAllowAnimatedContent 是应该释放微调器的选项。

[UIView transitionWithView:self.navigationController.view 
                          duration:1.0 
                           options:UIViewAnimationOptionAllowAnimatedContent | UIViewAnimationTransitionCurlUp | UIViewAnimationOptionCurveEaseInOut 
                        animations:^{[self.navigationController pushViewController:shvc animated:NO];}
                        completion:nil];