NSOperation使用系统提供子类的方法--处理复杂任务

转载于 2015-03-29 21:34:00 发布 · 74 阅读

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原文链接：http://www.cnblogs.com/thbbsky/p/4376425.html

 //创建一个队列
    NSOperationQueue *operation=[[NSOperationQueue alloc]init];
    //把任务放在NSBlockOperation里面
    NSBlockOperation *myOperation=[NSBlockOperation blockOperationWithBlock:^{
        NSData *firstData=[NSData dataWithContentsOfURL:[NSURL URLWithString:KURL1]];
     
        dispatch_async(dispatch_get_main_queue(), ^{
           
            _firstImageView.image=[UIImage imageWithData:firstData];
       });
       
    }];
  
    //把第二任务添加到操作队列
    [myOperation addExecutionBlock:^{
        NSData *secondData=[NSData dataWithContentsOfURL:[NSURL URLWithString:KURL1]];
        
        dispatch_async(dispatch_get_main_queue(), ^{
            
            _secondImageView.image=[UIImage imageWithData:secondData];
        });
        
    }];
    [operation addOperation:myOperation];