线程9--NSOperation

/*************************************************************/
    //即默认情况下，如果操作没有放到队列中queue中，都是同步执行。只有将NSOperation放到一个NSOperationQueue中,才会异步执行操作
    NSLog(@"主线程---%@",[NSThread currentThread]);
    NSInvocationOperation *operation1=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test1) object:nil];
    [operation1 start];
/*************************************************************/
   //注意:只要NSBlockOperation封装的操作数 > 1,就会异步执行操作
    NSBlockOperation *operation2=[NSBlockOperation blockOperationWithBlock:^{
        for (int i=1; i<5; i++) {
            
            NSLog(@"NSBlockOperation1----%@",[NSThread currentThread]);}
    }];
    
    [operation2 addExecutionBlock:^{
        for (int i=1; i<5; i++) {
            
        NSLog(@"NSBlockOperation2----%@",[NSThread currentThread]);}
    }];
    [operation2 addExecutionBlock:^{
        for (int i=1; i<5; i++) {
            
        NSLog(@"NSBlockOperation3----%@",[NSThread currentThread]);
        
        }
    }];
    //放入队列后就不需要这句；
    [operation2 start];
    
/*************************************************************/
    /*1）先将需要执行的操作封装到一个NSOperation对象中
    
    （2）然后将NSOperation对象添加到NSOperationQueue中
    
    （3）系统会?动将NSOperationQueue中的NSOperation取出来
    
    （4）将取出的NSOperation封装的操作放到?条新线程中执?
    */
    
     NSInvocationOperation *operation3=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test3) object:nil];
    NSInvocationOperation *operation4=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test4) object:nil];

    NSOperationQueue *queue=[[NSOperationQueue alloc]init];
    [queue addOperation:operation2];
    [queue addOperation:operation3];
    [queue addOperation:operation4];
    

/*************************************************************/

-(void)test1{
    NSLog(@"operation1--test1---%@",[NSThread currentThread]);
}
-(void)test3{
    for (int i=1; i<5; i++) {
        
    NSLog(@"NSOperationQueue-test3----%@",[NSThread currentThread]);
    }
    
}
-(void)test4{
    for (int i=1; i<5; i++) {
        
    
    NSLog(@"NSOperationQueue--test4---%@",[NSThread currentThread]);
 }
}