iOS 开启多线程

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(一) 使用NSOperation和NSOperationQueue开启多线程:(不是很简洁的开启线程方法)

    @interface c:NSOperation

    -(void) main;

    @end

    

    @implementation c:NSOperation

    

    -(void) main{

        printf("operation!\n");

    }

    

    @end

    

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];

    for (int i = 0; i < 1000; ++i) {

        c *operation = [[c alloc] init];

        [queue addOperation:operation];

    }

(二)使用 NSInvocationOperation开启多线程 (简洁的开线程的方法)

    NSOperationQueue* queue;

    NSInvocationOperation *operation = [[NSInvocationOperationalloc] initWithInvocation:invocation];

    [queueaddOperation:operation];

    // 定义一个invocation: 理解NSInvocationhere

    NSString* cachePath =cachePathForKey(key);

    NSInvocation* invocation = [NSInvocationinvocationWithMethodSignature:[self             

                   methodSignatureForSelector:@selector(writeData:toPath:)]];

[invocationsetTarget:self];

[invocationsetSelector:@selector(writeData:toPath:)];

[invocationsetArgument:&data atIndex:2];

[invocationsetArgument:&cachePath atIndex:3];