ios - 在加载数据时播放动画

Question

目前在我的 AppDelegate.m 我有代码:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self.window makeKeyAndVisible];
    CGRect  rect = [[UIScreen mainScreen] bounds];
    UIImageView *imageView =[[UIImageView alloc] initWithFrame:rect];
    imageView.animationImages = [NSArray arrayWithObjects:
                                 [UIImage imageNamed:@"Comp 2_00000.png"],..., nil];
    imageView.animationDuration = 6;
    imageView.animationRepeatCount = 1;
    [imageView startAnimating];
    [self.window addSubview:imageView];

    return YES;
}

一旦我的 View 在我的 ViewController.m 中加载了代码，它就播放了一个动画。m 加载了一些数据，这大约需要 5 秒。

我使用 JSON 和 URLS 像这样加载数据:

 NSURL *url = [NSURL URLWithString:@"http://xxxxxxxx.co.uk/untitled%20folder/jsonimages.php"];
    NSData *jsonData = [NSData dataWithContentsOfURL:url];
    NSError *error = nil;

    NSDictionary *result = [NSJSONSerialization JSONObjectWithData:jsonData
                                                           options:NSJSONReadingMutableContainers error:&error];

加载数据时是否播放动画？

Answer 1

创建一个辅助函数(如果需要重用，则将其设为静态):

功能:

-(UIImageView *) InitImageView{    
    [self.window makeKeyAndVisible];
    CGRect  rect = [[UIScreen mainScreen] bounds];
    UIImageView *imageView =[[UIImageView alloc] initWithFrame:rect];
    imageView.animationImages = [NSArray arrayWithObjects:
                           [UIImage imageNamed:@"Comp 2_00000.png"],..., nil];
    //imageView.animationDuration = 6;
    imageView.animationRepeatCount = 1;

    [self.view addSubview:imageView];

    return imageView;
}

异步任务:

//Start Animation
UIImageView *imageView = [self InitImageView];
[imageView startAnimating];

dispatch_queue_t queue = dispatch_queue_create("co.uk.bits.bots", NULL);
dispatch_async(queue, ^{
 NSURL *url = [NSURL URLWithString:@"http://xx.co.uk/jsonimages.php"];
    NSData *jsonData = [NSData dataWithContentsOfURL:url];
    NSError *error = nil;

    NSDictionary *result = [NSJSONSerialization JSONObjectWithData:jsonData
                         options:NSJSONReadingMutableContainers error:&error];
    dispatch_async(dispatch_get_main_queue(), ^{
        //Stop Animation
        [imageView stopAnimating];
    });
});