OC中6种多线程的使用方式

NSThread 实例创建；

NSThread类方法创建；

PerformSelectorOnBackground;

NSOperationQueue block添加operation;

 NSOperationQueue直接添加operation;

dispatch_queue_create dispatch_async;

代码实现：

 //one

    NSThread *t = [[NSThreadalloc]initWithTarget:selfselector:@selector(mutableThread)object:nil];

    [t start];

    //two

   [NSThreaddetachNewThreadSelector:@selector(mutableThread)toTarget:selfwithObject:nil];

    //three

    [selfperformSelectorInBackground:@selector(mutableThread)withObject:nil];

    //four

    NSOperationQueue *queue = [[NSOperationQueuealloc]init];

    [queue addOperationWithBlock:^{

        NSThread *thr = [[NSThreadalloc]init];

        if (![thr isMainThread]) {

            NSLog(@"是多线程");

        }

    }];

    //five

    NSOperationQueue *que = [[NSOperationQueuealloc]init];

    NSInvocationOperation *op = [[NSInvocationOperationalloc]initWithTarget:selfselector:@selector(mutableThread)object:nil];

    [que addOperation:op];

    //six

    dispatch_queue_t  ddph =dispatch_queue_create("hehe",NULL);

    dispatch_async(ddph, ^{

        if (![[NSThreadcurrentThread] isMainThread]) {

            NSLog(@"是多线程");

        }

    });