Example of multithreading in objective-C (IOS)

//  Initialize Lock Object Ticketcondition = [[Nscondition alloc] init];  //  Start the first thread. Ticketsthreadone = [[nsthread alloc] initwithtarget: Self selector: @ selector (run) Object  : Nil]; [ticketsthreadone setname:  @"  Thread-1  "  ]; [Ticketsthreadone start];  //  Start the second thread. Ticketsthreadtwo = [[nsthread alloc] initwithtarget: Self selector: @ selector (run) Object  : Nil]; [ticketsthreadtwo setname:  @"  Thread-2  "  ]; [Ticketsthreadtwo start]; -( Void  ) Run {  While  (True ){  //  Lock [Ticketscondition Lock  ]; //  Dosomething ..  [Ticketscondition unlock];}  //  Release resources. -( Void  ) Dealloc {[ticketsthreadone release]; [ticketsthreadtwo release]; [ticketscondition release]; [Super dealloc];}  //  When a thread is running, it may need to communicate with other threads, such as modifying the interface in the main thread. You can use the following interface: -( Void ) Performselecw.mainthread :( SEL) aselector withobject :( ID ) Arg waituntildone :( bool) wait such as: [self authentication mselecw.mainthread: @ selector (updateui) withobject: Nil waituntildone: No];  //  Updateui is the method name exchanged with the UI.  //  Enable the nyothoreleasepool. 

 

Use another method to create a subthread:

 //  The nsthread class is used. Here we use detachnewtheadselector: totagaet: withobject to create a thread.  //  Function setupthread :( nsarray *) userinfor. Use userinfor to upload the required data to the thread.  //  Function Definition: -( Void ) Setupthread :( nsarray * ) Userinfor {[nsthread detachnewthreadselector: @ selector (threadfunc :) totarget: Self withobject :(  ID  ) Userinfor];
// Note that threadfunc is followed by a colon. The threadfunc method carries the ID parameter.} -( Void ) Threadfunc :( ID  ) Userinfor {ngutoreleasepool * Pool = [[NSAID utoreleasepool alloc] init];  //  .... The processing that needs to be done.  //  Return immediately after the thread ends. [Self defined mselecw.mainthread: @ selector (endthread) withobject: Nil waituntildone: No]; [pool release];}  //  Performselectoronmainthread notifies the main thread to execute the function endthread. You can also use javasmselector: onthread: withobject: waituntil to notify a thread of processing after the execution thread ends.  //  Do not refresh the interface within the thread. If you need to refresh the interface, call out the methods in the main thread to refresh through performselecdomainmainthread.