线程10--NSOperation的基本操作

- (void)viewDidLoad {
    [super viewDidLoad];
/***********************************************************/
    NSInvocationOperation *operation1=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test1) object:self];
    
    NSInvocationOperation *operation2=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test2) object:nil];
    
    NSBlockOperation *operation3=[NSBlockOperation blockOperationWithBlock:^{
        for(int i=0;i<5;i++){
            NSLog(@"NSBlockOperation--1--%@",[NSThread currentThread]);
        }
    }];
    
    [operation3 addExecutionBlock:^{
        for (int i=0; i<5; i++) {
            NSLog(@"NSBlockOperation--2--%@",[NSThread currentThread]);
        }
    }];
    
    //设置操作依赖
         //先执行operation2，再执行operation1，最后执行operation3
         [operation3 addDependency:operation1];
         [operation1 addDependency:operation2];
    
         //不能是相互依赖
     //    [operation3 addDependency:operation1];
     //    [operation1 addDependency:operation3];
    NSOperationQueue *queue=[[NSOperationQueue alloc]init];
    [queue addOperation:operation1];
    [queue addOperation:operation2];
    [queue addOperation:operation3];
/*****************************监听**************************/
    //创建对象，封装操作
    NSBlockOperation *operation=[NSBlockOperation blockOperationWithBlock:^{
        for (int i=0; i<10; i++) {
            NSLog(@"-operation-下载图片-%@",[NSThread currentThread]);
        }
    }];
    
    //监听操作的执行完毕
    operation.completionBlock=^{
        //.....下载图片后继续进行的操作
        NSLog(@"--接着下载第二张图片--");
    };
    
    //创建队列
    NSOperationQueue *queue1=[[NSOperationQueue alloc]init];
    //把任务添加到队列中（自动执行，自动开线程）
    [queue1 addOperation:operation];
/***********************************************************/
}
-(void)test1{
    NSLog(@"NSInvocationOperation-test1-%@",[NSThread currentThread]);
}
-(void)test2{
    NSLog(@"NSInvocationOperation-test2-%@",[NSThread currentThread]);
    
}