目标C中的进程间通信 [英] Intra-Process Communication in Objective C

问题描述

我想知道如何一个子线程与目标C中的父线程谈话。我从我的主线程产生一个线程，并想要关于一些动作的主线程并继续。

解决方案

• 如果在子线程中发布NSNotification，接收通知并在下执行与发件人相同的线程。


• 线程之间的信息可以通过共享内存传输，例如：struct，primitive types（int，CGFloat等）。



• 线程之间的信息可以通过 threadDictionary 属性。我更喜欢使用这个来注册一些状态变量。例如，当滚动时，我将设置以下。

    
   NSMutableDictionary * dictInfo = [NSThread mainThread] .threadDictionary; 
   [dictInfo setObject：[NSNumber numberWithbool：YES] forKey：_kThreadPause]; 
    

  当工作线程看到_kThreadPause设置为YES时，它将进入休眠状态。
  

    
   BOOL bPause = [[[[NSThread mainThread] .threadDictionary objectForKey：_kThreadPause] boolValue]; 
   if（bPause）[NSThread sleepForTimeInterval：0.1]; 
   
   
   




• 正如DavidNeiss所说，您可以使用NSObject的方法来执行选择器主线程或子线程。

  
  
  

  如果有时间，可以阅读线程编程指南。

I want to know how can a child thread talk to parent thread in Objective C. I am spawning a thread from my main thread and want to intimate main thread about some action and keep continuing. How to achieve this?

解决方案

• If you post a NSNotification in the child thread, the receiver will receive the notification and execute under the same thread as the sender. The apple document said that and marked as a note.
• The information between threads can be transfered by a shared memory, ex: a struct, primitive types (int, CGFloat, etc).

• The information between thread can be transfered by threadDictionary property of NSThread. I prefer to use this to register some status variables. For example, when scrolling, I will set following.

  
  NSMutableDictionary *dictInfo = [NSThread mainThread].threadDictionary;
  [dictInfo setObject:[NSNumber numberWithbool:YES] forKey:_kThreadPause];
  

  The worker thread will go to sleep when it see the _kThreadPause is set to YES.

  
  BOOL bPause = [[[NSThread mainThread].threadDictionary objectForKey:_kThreadPause] boolValue];
  if (bPause) [NSThread sleepForTimeInterval:0.1];
  

• As DavidNeiss said, you can use methods of NSObject to perform selector on main thread or child thread.

  If you have time, you can read threading programming guide.

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