iOS多线程编程(二)NSOperationQueue

#pragma mark - NSBlockOperation- (void)test4{        NSOperationQueue * threadQueue = [[NSOperationQueue alloc] init];    // Block真心方便    [threadQueue addOperationWithBlock:^{                for (int i =0; i <100; i++) {            NSLog(@"--多线程--%d",i);        }    }];        for (int i =0; i <100; i++) {        NSLog(@"--主线程--%d",i);    }        [threadQueue release];}#pragma mark - NSInvocationOperation- (void)test5{        //创建一个线程队列    NSOperationQueue * threadQueue = [[NSOperationQueue alloc]init];    //设置线程执行的并发数( -1 代表没有限制)    threadQueue.maxConcurrentOperationCount =1;        //创建一个线程操作对象    NSInvocationOperation * threadOperation = [[NSInvocationOperation alloc]initWithTarget:selfselector:@selector(mutableThread5)object:nil];    //设置线程操作对象的优先级    threadOperation.queuePriority =NSOperationQueuePriorityVeryHigh;        //可添加多个,还有一个添加数组对象的方法    [threadQueue addOperation:threadOperation];        for (int i =0; i <100; i++) {        NSLog(@"--主线程--%d",i);    }        [threadOperation release];    [threadQueue release];}- (void)mutableThread5{        for (int i =0; i <100; i++) {        NSLog(@"--多线程--%d",i);    }}@最后看看NSOperationQueue的其它常用方法：- (void)addOperations:(NSArray *)ops waitUntilFinished:(BOOL)wait; //批量加入执行operation，wait标志是否当前线程等待所有operation结束后，才返回- (void)addOperationWithBlock:(void (^)(void))block; //相当于加入一个NSBlockOperation执行任务- (NSArray *)operations; //返回已加入执行operation的数组，当某个operation结束后会自动从这个数组清除- (NSUInteger)operationCount //返回已加入执行operation的数目- (void)setSuspended:(BOOL)b; //是否暂停将要执行的operation，但不会暂停已开始的operation- (BOOL)isSuspended; //返回暂停标志- (void)cancelAllOperations; //取消所有operation的执行，实质是调用各个operation的cancel方法+ (id)currentQueue; //返回当前NSOperationQueue，如果当前线程不是在NSOperationQueue上运行则返回nil+ (id)mainQueue; //返回主线程的NSOperationQueue，缺省总是有一个queue