在后台运行进程，而用户仍然可以使用 UI [英] run a process in the background while user can still use the UI

问题描述

我试图在不锁定用户界面的情况下在后台运行数据库提取过程.

I am attempting to run a database fetch process in the background without locking the user interface.

目前我有一个按钮可以执行此操作，但我希望它是自动的，以便在用户浏览当前结果时可以获得更多结果.

Currently I have a button that does this, but I would like it to be automatic so that it can get more results as user is browsing current results.

这是按钮的代码，我想让它自动而不是锁定用户界面.此外，如果有一种方法可以暂停该过程，但如果用户转到另一个也非常有用的屏幕，则从中断处继续.

Here is the code that the button does, I would like to make this automatic and not lock the UI. Also if there is a way to pause the process, but continue where it left off if user goes to another screen that would also be very useful.

提前致谢！

-(IBAction)continueUpdatingResultsButtonPressed:(UIButton*)sender{
[findMoreButton removeFromSuperview];
[self continueFindingMoreRecipes]; //(do this in background without locking screen)
[self loadRefreshButton];//At completion load this button (a blinking button) to refresh the cells with new results

}

推荐答案

您可以使用的典型模式如下:

A typical pattern you can use is something like this:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // perform data processing here (done in the background)

    dispatch_async(dispatch_get_main_queue(), ^{
        // update user interface here (done on the main thread)
    });
});

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