方式1 dispatch_group_enter && dispatch_group_leave
dispatch_group_t group = dispatch_group_create();
dispatch_group_enter(group);
[self getAdvertList:^(BOOL iscomple) {
dispatch_group_leave(group);
}];
// requset2
dispatch_group_enter(group);
[self getHotCultureList:^(BOOL iscomple) {
dispatch_group_leave(group);
}];
dispatch_group_notify(group, dispatch_get_main_queue(), ^{
//等待requset1， requset2均调用dispatch_group_leave则进入dispatch_group_notify
}
方式2 dispatch_semaphore_t
//信号量
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
//创建全局并行
dispatch_group_t group = dispatch_group_create();
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
//任务一
dispatch_group_async(group, queue, ^{
[self getAdvertList:^(BOOL iscomple) {
dispatch_semaphore_signal(semaphore);
}];
});
//任务二
dispatch_group_async(group, queue, ^{
[self getHotCultureList:^(BOOL iscomple) {
dispatch_semaphore_signal(semaphore);
}];
});
dispatch_group_notify(group, queue, ^{
//6个任务,6个信号等待.
dispatch_semaphore_wait(semaphore,DISPATCH_TIME_FOREVER);
dispatch_semaphore_wait(semaphore,DISPATCH_TIME_FOREVER);
//这里就是所有异步任务请求结束后执行的代码
//[self.home TableView.mj_header endRefreshing];
//这里两个网络请求结束后。获取到的。一个参数用于第三个借口参数
NSLog(@"------------4444444444444444-xin hao-------%@", self.imeiStr);
};