ios - UIActivityIndi​​catorView不显示/开始动画

我有一个带有UIActivityIndi​​catorView的视图控制器和一个触发同步的按钮。同步是在单独的类中执行的，通常在后台执行。可以从我的应用程序的不同部分触发同步，并且通知我的视图控制器同步事件。

现在，当我单击按钮时，UIActivityIndi​​catorView变得不可见或不可见。

这是我在viewDiDLoad中的代码：

self.syncNowActivityIndicatorView.hidesWhenStopped = YES;
self.syncNowActivityIndicatorView.color = [MRStyleController getFirstLightColor];



[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(leechStarted)
                                             name:MRLeechStartedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(mergeStarted)
                                             name:MRMergeStartedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(fileSyncStarted)
                                             name:MRFileSyncStartedNotification
                                           object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(leechFailed)
                                             name:MRLeechFailedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(mergeFailed)
                                             name:MRMergeFailedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(fileSyncFailed)
                                             name:MRFileSyncFailedNotification
                                           object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(leechCompleted)
                                             name:MRLeechCompletedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(mergeCompleted)
                                             name:MRMergeCompletedNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(fileSyncCompleted)
                                             name:MRFileSyncCompletedNotification
                                           object:nil];

我在其他文章中也读到过，如果我以相同的方法启动和停止指标视图，它将无法正常工作，因为在执行该方法时不会更新ui。因此，动画必须在单独的线程中启动和停止，但是在我的情况下，start和stop调用都使用不同的方法。

请注意，如我的日志所示，我正在接收通知。

以下是其他方法：

-(void)leechStarted{
    NSLog(@"Leech started");
    if (!_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView startAnimating];
    }
}
-(void)mergeStarted{
    NSLog(@"Merge started");
    if (!_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView startAnimating];
    }
}
-(void)fileSyncStarted{
    NSLog(@"FileSync started");
    if (!_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView startAnimating];
    }
}

-(void)leechFailed{
    NSLog(@"Leech failed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
}
-(void)mergeFailed{
    NSLog(@"Merge failed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
}
-(void)fileSyncFailed{
    NSLog(@"FileSync failed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
}

-(void)leechCompleted{
    NSLog(@"Leech completed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
}
-(void)mergeCompleted{
    NSLog(@"Merge completed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
 }
 -(void)fileSyncCompleted{
    NSLog(@"FileSync completed");
    if (_syncNowActivityIndicatorView.isAnimating) {
        [_syncNowActivityIndicatorView stopAnimating];
    }
 }

这里是按钮的IBAction：

- (IBAction)syncNow:(id)sender {
    // perform synchronisation
    CoreDataHelper *cdh = [(MRMedSafeAppDelegate *) [[UIApplication sharedApplication] delegate] cdh];
    if ([cdh canSynchronize]) {
        [cdh mergeEnsemble];
        [cdh synchroniseFiles];
    }
}

mergeEnsemble发布水ech和合并通知，以及synchroniseFiles文件同步通知，我根据日志收到它们。

最佳答案

您必须在主线程上执行启动/停止动画处理：

-(void)stopAnimation:(id)sender {
   if( _syncNowActivityIndicatorView.isAnimating ) {
      [_syncNowActivityIndicatorView stopAnimating];
   }
}

-(void)startAnimation:(id)sender {
   if( !_syncNowActivityIndicatorView.isAnimating ) {
      [_syncNowActivityIndicatorView startAnimating];
   }
}

-(void)leechStarted{
    NSLog(@"Leech started");
    [self performSelectorOnMainThread:@selector(startAnimation:) withObject:self waitUntilDone:YES];
}

-(void)leechFailed{
    NSLog(@"Leech failed");
    [self performSelectorOnMainThread:@selector(stopAnimation:) withObject:self waitUntilDone:YES];
}

关于ios - UIActivityIndi​​catorView不显示/开始动画，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24944793/