IOS-线程异步操作GCD

NSAutoreleasePool * pool = [[NSAutoreleasePoolalloc]init];
const char* queueName = [[[NSDatedate]description]
UTF8String];
dispatch_queue_t myQueue =
dispatch_queue_create(queueName, NULL);
dispatch_queue_t mainQueue =
dispatch_get_main_queue();

dispatch_async(myQueue, ^{
//新线程中要操作的（例如数据库的读取，存储等）

dispatch_async(mainQueue, ^{
//主线程中要操作的（例如UI页面刷新）

});
});

dispatch_release(myQueue);
dispatch_release(mainQueue);
[pool drain];