选择 UITableView 后如何推送加载视图？

发布于 2024-11-13 07:42:22 字数 205 浏览 5 评论 0原文

现在我在显示加载视图时遇到问题。这个过程是这样的：

在 UITableView 中选择行
从主视图弹出 UITableView
将 Loadingview 推送到主视图
调用使用 JSON 请求的长方法

问题是，当我选择表中的行时，它会在那里暂停，直到一切完成。我该如何解决这个问题？

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拥有 2024-11-20 07:42:22

您需要在单独的线程上加载数据。就我个人而言，我要做的是将加载视图推入主视图，然后生成一个加载数据的新线程。数据加载完成后，您可以编组回 UI 线程，关闭加载视图，然后呈现您将在其中显示数据的任何视图。

您的实现将如下所示：

// push loading view..
// spawn thread
[NSThread detachNewThreadSelector:@selector(loadData:) toTarget:self withObject:nil];

-(void)loadData:(id) obj {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    // load your data
    [self performSelectorOnMainThread:@selector(updateUI:) withObject:data waitUntilDone:NO];
    [pool release];
}

-(void)updateUI:(id)data {
    // update the data
}

You'll want to load the data on a separate thread. Personally, what I'd do is push the loading view into the main view then spawn a new thread that loads the data. Once the data has loaded, you can marshall back to the UI thread, dismiss the loading view and then present whatever view it is that you'll be displaying your data in.

Your implementation will look something like this:

// push loading view..
// spawn thread
[NSThread detachNewThreadSelector:@selector(loadData:) toTarget:self withObject:nil];

-(void)loadData:(id) obj {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    // load your data
    [self performSelectorOnMainThread:@selector(updateUI:) withObject:data waitUntilDone:NO];
    [pool release];
}

-(void)updateUI:(id)data {
    // update the data
}

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我很坚强 2024-11-20 07:42:22

使用 GCD 并发送异步请求，当请求完成时转到主线程并执行您想要的操作。

//addProgressIndicator
__weak typeof(self) weakSelf = self;
dispatch_async(dispatch_get_global_queue(0, 0), ^{
    //call your request. Here could be your call back too, depends to architecture of your code
    NSDictionary *response = [WebService sendRequest];

    dispatch_async(dispatch_get_main_queue(), ^{

        //removeProgressIndicator
        //do what you want after request is finished with your UI

    });
});

Use GCD and send async request, when request finished go to main thread and do what you want.

//addProgressIndicator
__weak typeof(self) weakSelf = self;
dispatch_async(dispatch_get_global_queue(0, 0), ^{
    //call your request. Here could be your call back too, depends to architecture of your code
    NSDictionary *response = [WebService sendRequest];

    dispatch_async(dispatch_get_main_queue(), ^{

        //removeProgressIndicator
        //do what you want after request is finished with your UI

    });
});

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