Use the dispatch group to allow the next operation to be performed after the current operation is completed, that is, the synchronization operation

Source: Internet
Author: User

Create a dispatch group

dispatch_group_t group = Dispatch_group_create ();

Manually manage the running state (or count) of the block associated with the group, the number of entry and exit group must match

Dispatch_group_enter(group);

Dispatch_group_leave(group);

This block is called when the block associated by the group is executed. Similar to Dispatch_barrier_async.

Dispatch_group_notify(Group, queue, ^{

。。。

});

Use the dispatch group to allow the next operation to be performed after the current operation is completed, that is, the synchronization operation

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