ios - MBProgressHUD 更新进度

Question

我有一个场景，我的应用程序仅在第一次下载大量数据，并且这种情况发生在 ViewController1 中。我使用不同的类来下载数据，使用另一个类来保存数据。所以我的问题是，如何更新在 ViewController1 中创建的 MBProgressHUD 对象的进度以向用户显示进度？

我采用的方法是使用NSNotificationCenter 发送通知。我在保存数据的类中的方法 (13) 末尾发送通知。

这是我一直在做的:

//ViewController1.h
@interface ViewController1 ()
{
    MBProgressHUD *hud;
    float progress;
}
@end


//ViewController1.m
        - (void)viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(receiveNotification:)
                                                     name:@"downloadComplete"
                                                   object:nil];

        }
- (IBAction)sumitButtonDidClick:(id)sender {
    hud = [[MBProgressHUD alloc] init];
    hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
    hud.label.text = NSLocalizedString(@"Please wait...", @"HUD preparing title");
    hud.minSize = CGSizeMake(150.f, 100.f);

        [hud showAnimated:YES];


        double delayInSeconds = 1.0;

        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
      progress = 0.0f;

        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
DownloadClass * obj1 = [[DownloadClass alloc] init];
            [obj1 downloadData];
dispatch_async(dispatch_get_main_queue(), ^{
                    [hud hideAnimated:YES];
});
}

- (void) receiveNotification:(NSNotification *) notification {

    if ([[notification name] isEqualToString:@"downloadComplete"])
    {
        NSLog (@"Successfully received the download complete notification!");
        progress += 7.7f;
        //[hud setProgress:progress]; // won't work
        dispatch_async(dispatch_get_main_queue(), ^{
        [MBProgressHUD HUDForView:self.view].progress = progress;


    });
    }
}

Update: I'm receiving the notifications posted by the class that saves data

Answer 1

您已经为 MBProgressHUD 创建了一个实例变量作为 MBProgressHUD *hud; 并且您开始在 sumitButtonDidClick 方法上取得进展，如下所示:

hud = [[MBProgressHUD alloc] initWithFrame:CGRectMake(0, -30, 320, 768) ];
        hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
        hud.label.text = NSLocalizedString(@"Please wait...", @"HUD preparing title");
        hud.minSize = CGSizeMake(150.f, 100.f);
        UIWindow *window=[[[UIApplication sharedApplication]delegate]window];

        hud.center=window.center;

        [window addSubview:hud];

        [hud showAnimated:YES];

但是作为 MBProgressHUD 的类方法增加进度为 [MBProgressHUD HUDForView:self.view].progress = progress;.

问题的修复如下:

dispatch_async(dispatch_get_main_queue(), ^{
   hud.progress = progress;
});

如果你想隐藏进度可以使用

 dispatch_async(dispatch_get_main_queue(), ^{
       [hud hideAnimated:YES];
    });