Question

我为这个冗长的问题在一开始就道歉。

在我的应用程序中，我下载了大视频文件（30-60Mb）。我显然想告诉用户进度。下载来自Urban Airship，我使用他们的一种方法来获得进展。然而，这发生在TableViewController中，但下载指示符（MBProgressHUD）从另一个视图开始，称之为UADetail。

要将进度从一个视图传递到另一个视图，我使用Singleton。随机地，它可以发生在早期，晚期或根本不发生，应用程序在日志中崩溃;

2012-03-12 15：13：30.528 isengua-en [3478：681f] HUD课程下载进度：0.053478 2012-03-12 15：13：30.553 isengua-en [3478：707]课程列表进度：0.055272 2012-03-12 15：13：30.562 isengua-en [3478：707] LLVC downHUD进展：0.055272 2012-03-12 15：13：30.565 isengua-en [3478：707] - [LessonListViewController＆gt; productsDownloadProgress：count：] [Line 57] [StoreFrontDelegate] productsDownloadProgress：0.055272 count：1 2012-03-12 15：13：30.569 isengua-en [3478：6307] * - [CFNumber _getValue：forType：]：发送到解除分配的实例0x83c6e80的消息

首先是LessonListViewController;

- (void)productsDownloadProgress:(float)progress count:(int)count 
{
    DataManager *sharedManager = [DataManager sharedManager];
    sharedManager.downHUD = [NSNumber numberWithFloat:progress];
    NSLog(@"Lessonlist progress: %f", progress);
    NSLog(@"LLVC downHUD progress: %f", [sharedManager.downHUD floatValue]);
    UALOG(@"[StoreFrontDelegate] productsDownloadProgress: %f count: %d", progress, count);
    if (count == 0) {
        NSLog(@"Downloads complete in LessonListView!");
    }

}

Singleton看起来像这样;

@implementation DataManager

@synthesize downHUD;




+ (DataManager *)sharedManager
{
    static DataManager *sharedManager = nil;
    static dispatch_once_t predicate;
    dispatch_once(&predicate, ^{
        sharedManager = [[self alloc] init]; 
    });
    return sharedManager;

}

- (id)init {
    if (self = [super init]) {
        downHUD = [NSNumber numberWithFloat:(float)0];
    }
    return self;
}


 - (void)dealloc {
 // Should never be called, but just here for clarity really.
     NSLog(@"dealloc called in DataManager");
 }



@end

然后在UADetail中读取;

- (void)showWithLabelDeterminate {

    HUD = [[MBProgressHUD alloc] initWithView:self.view]; 
    [self.view addSubview:HUD];


    // Set determinate mode
    HUD.mode = MBProgressHUDModeIndeterminate;
    HUD.delegate = self;
    HUD.labelText = NSLocalizedString(@"Waiting","");

    // myProgressTask uses the HUD instance to update progress
    [HUD showWhileExecuting:@selector(lessonDownloadProgress) onTarget:self withObject:nil animated:YES];
}


-(void)lessonDownloadProgress
{
    DataManager *sharedManager = [DataManager sharedManager];
    HUD.mode = MBProgressHUDModeDeterminate;
    HUD.progress = [sharedManager.downHUD floatValue];
    HUD.labelText = NSLocalizedString(@"DownLoading","");

    while (HUD.progress < 1)
    {
        [self parentViewController];
        NSLog(@"HUD lessonDownloadProgress: %f", HUD.progress);
        HUD.progress = [sharedManager.downHUD floatValue];                       
        NSString *percent = [NSString stringWithFormat:@"%.0f", HUD.progress/1*100];
        HUD.detailsLabelText = [percent stringByAppendingString:@"%"];
    }
}

Answer 1

我想我自己找到了解决方案。在while循环中放入一个usleep（50000）后它停止了。也许循环运行得太快并且经常检查sharedManager.downHUD，干扰从另一个类写入它。

ios将数据传递给MBProgressHUD以奇怪的崩溃结束

1 个答案: