iOS 多线程NSOperation

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NSOperation有两个子类：NSInvocationOperation 和 NSBlockOperation

NSOperation 如果有多个任务事，默认是异步执行的，如下代码。

NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{        NSLog(@"1");    }];    NSBlockOperation *operation2 = [NSBlockOperation blockOperationWithBlock:^{        NSLog(@"2");    }];    NSBlockOperation *operation3 = [NSBlockOperation blockOperationWithBlock:^{        NSLog(@"3");    }];    NSBlockOperation *operation4 = [NSBlockOperation blockOperationWithBlock:^{        NSLog(@"4");    }];    NSBlockOperation *operation5 = [NSBlockOperation blockOperationWithBlock:^{        NSLog(@"5");    }];NSOperationQueue *queue = [[NSOperationQueue alloc]init];    [queue addOperation:operation];    [queue addOperation:operation2];    [queue addOperation:operation3];    [queue addOperation:operation4];    [queue addOperation:operation5];

但是把它的最大线程数设置为1，就是同步执行了，个中原理各位看官自己去想

queue.maxConcurrentOperationCount = 1;

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