iOS开发多线程-线程间通讯

一、NSThread 线程间的通讯

 - (void)demoAboutNSThread
 {
     NSLog(@"demoAboutNSThread %@", [NSThread currentThread]);
     NSThread * thread = [[NSThread alloc] initWithTarget:self selector:@selector(longTimeOperation) object:nil];
     [thread start];
 }

 - (void)longTimeOperation
 {
      NSLog(@"longTimeOperation %@", [NSThread currentThread]);
     [self performSelectorOnMainThread:@selector(mainThreadOperation) withObject:nil waitUntilDone:NO];
 }

 - (void)mainThreadOperation
 {
     NSLog(@"mainThreadOperation %@",[NSThread currentThread]);
 }

二、GCD 线程间通讯

 - (void)dispatchDemo
 {
     NSLog(@" start %@",[NSThread currentThread]);

     dispatch_async(dispatch_get_global_queue(, ), ^{
         NSLog(@" 耗时从左 %@",[NSThread currentThread]);

         dispatch_sync(dispatch_get_main_queue(), ^{
             NSLog(@" 回到主线程 %@", [NSThread currentThread]);
         });

     });

     NSLog(@"end %@",[NSThread currentThread]);
 }

三、NSOperation 线程间的通讯

 - (void)demoAboutNSOperation
 {
    NSOperation * block =  [NSBlockOperation blockOperationWithBlock:^{
         NSLog(@"block %@",[NSThread currentThread]);
     }];

     [self.queue addOperation:block];

     [self.queue addOperationWithBlock:^{
         NSLog(@"耗时操作 %@",[NSThread currentThread]);
         [[NSOperationQueue mainQueue] addOperationWithBlock:^{
             NSLog(@" mainQueue %@",[NSThread currentThread]);
         }];
     }];

 }