dispatch_queue_t aHQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0); dispatch_queue_t aLQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0); 啥意思一看就明白,3个优先级别的concurrent queues 最后一个特殊的Dispatch Queue就是main dispatch Queue 也是程序启动自动生成 ...
dispatch_get_global_queue会获取一个全局队列,我们姑且理解为系统为我们开启的一些全局线程。我们用priority指定队列的优先级,而flag作为保留字段备用(一般为0)。 dispatch_get_main_queue会返回主队列,也就是UI队列。它一般用于在其它队列中异步完成了一些工作后,需要在UI队列中更新界面(比如上面代码中的[self updateU...
dispatch_queue_taLQueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW,0); 啥意思一看就明白,3个优先级别的concurrent queues 最后一个特殊的Dispatch Queue就是main dispatch Queue也是程序启动自动生成 dispatch_queue_t mainQueue =dispatch_get_main_queue(); concurrent queues和main queue都是由系统生...
dispatch_get_main_queue(); 1. 2. 3. 4. 5. 6. 7. 8. 9. dispatch_async 函数会将传入的block块放入指定的queue里运行。这个函数是异步的,这就意味着它会立即返回而不管block是否运行结束。因此,我们可以在block里运行各种耗时的操作(如网络请求) 而同时不会阻塞UI线程。 dispatch_get_global_queue 会...
在iOS/Mac 编程中,经常使用 Grand Central Dispatch,它的语法使用回调。如: dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), { print("This is run on the background queue") let result = "hello, World" dispatch_async(dispatch_get_main_queue(), { print("This is...
dispatch_get_main_queue dispatch_get_global_queue Queues and Tasks dispatch_get_main_queue dispatch_get_global_queue Dispatch Queue Dispatch Work Item Dispatch Group Workloop Thread Scheduling T dispatch_qos_class_t T dispatch_queue_priority_t dispatch_set_qos_class_floor System...
dispatch_get_main_queue dispatch_get_global_queue Queues and Tasks dispatch_get_main_queue dispatch_get_global_queue Dispatch Queue Dispatch Work Item Dispatch Group Workloop Thread Scheduling T dispatch_qos_class_t T dispatch_queue_priority_t dispatch_set_qos_class_floor System...
dispatch_get_main_queue dispatch_get_global_queue dispatch_queue_create dispatch_queue_attr_make_with_qos_class dispatch_queue_get_label dispatch_queue_get_qos_class dispatch_queue_create_with_target 在队列上提交任务 概述 dispatch_async dispatch_async_f dispatch_sync dispatch_sync_...
void dispatch_async(dispatch_queue_t queue, dispatch_block_t block); 这里,queue是一个dispatch_queue_t类型的队列,block是一个执行任务的代码块。 查阅相关文档或资料,确认dispatch_async函数所需的正确参数: 确保传入的queue是一个有效的GCD队列,比如dispatch_get_global_queue或dispatch_get_main_queue返回...
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSString *query = "/api/something"; NSString *parameters = "a=1234&b=5678"; _myDict = (NSMutableDictionary*)[NetworkUtility postDataToServer:query withParameters:parameters]; // Done with API Call dispatch_as...