RunLoop的简单应用

- (void)runLoopAddDependance{
    
    self.runLoopThreadDidFinishFlag = NO;
    NSLog(@"Start a New Run Loop Thread");
    NSThread *runLoopThread = [[NSThread alloc] initWithTarget:self selector:@selector(handleRunLoopThreadTask) object:nil];
    [runLoopThread start];
    
    NSLog(@"Exit handleRunLoopThreadButtonTouchUpInside");
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        
        
        while (!self.runLoopThreadDidFinishFlag) {
            
            self.myThread = [NSThread currentThread];
            NSLog(@"Begin RunLoop");
            NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
            NSPort *myPort = [NSPort port];
            [runLoop addPort:myPort forMode:NSDefaultRunLoopMode];
            [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
            NSLog(@"End RunLoop");
            [self.myThread cancel];
            self.myThread = nil;
            
        }
    });
}

- (void)handleRunLoopThreadTask
{
    NSLog(@"Enter Run Loop Thread");
    for (NSInteger i = 0; i < 5; i ++) {
        NSLog(@"In Run Loop Thread, count = %ld", i);
        sleep(1);
    }
#if 0
    // 错误示范
    _runLoopThreadDidFinishFlag = YES;
    // 这个时候并不能执行线程完成之后的任务，因为Run Loop所在的线程并不知道runLoopThreadDidFinishFlag被重新赋值。Run Loop这个时候没有被任务事件源唤醒。
    // 正确的做法是使用 "selector"方法唤醒Run Loop。 即如下:
#endif
    NSLog(@"Exit Normal Thread");
    [self performSelector:@selector(tryOnMyThread) onThread:self.myThread withObject:nil waitUntilDone:NO];
    
    // NSLog(@"Exit Run Loop Thread");
}

- (void)tryOnMyThread{
    _runLoopThreadDidFinishFlag = YES;
}

demo：https://github.com/ITHanYong/RunLoop.git