iPhone enumerateGroupsWithTypes整理选择器 [英] iPhone enumerateGroupsWithTypes finishing selector

问题描述

我正在使用

[assetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:listGroupBlock failureBlock:failureBlock];

枚举相册.

枚举器以异步"方式运行，换句话说，方法在枚举所有项之前返回.

The enumerator is acting in an "asynchronous" way, in other words the methods returns before enumerating all items.

我怎么知道枚举何时完成?

How can I know when the enumeration is finished?

我正在使用组填充NSMutableArray，并在枚举完成后调用 [myTableView reloadData] .

I'm populating a NSMutableArray with the groups, and would to call [myTableView reloadData] after enumeration is finished.

推荐答案

您的枚举将为您的块提供nil-pointer组，并在其最后经过时将stop设置为true.您可以使用它来设置标志，也可以在下次通过RunLoop时使用performSelectorOnMainThread:调用一些整理代码.

Your enumeration will give your block a nil-pointer group and set stop to true when it goes through its last pass. You can use this to set a flag or call some finishing code using performSelectorOnMainThread: on the next pass through the RunLoop.

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