ios - 隐藏 Nib 内容直到任务完成

Question

我正在尝试完成一项任务，然后希望将 xib 内容显示在 View 上。但是VC是通过nibFile初始化的，有没有办法在任务完成后延迟加载nib？

谢谢

Answer 1

在viewDidLoad中:

self.view.hidden = YES;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // do your background tasks here
    [self doSomethingInBackground];

    // when that method finishes you can run whatever you need to on the main thread
    dispatch_async(dispatch_get_main_queue(), ^{
        self.view.hidden = NO;
    });
});

(改编自Implement a block in background, then after completion run another block on main thread?)