多线程-NSBlockOperation

- (IBAction)blockQueue:(UIButton *)sender {
    
    NSOperationQueue *queue = [[NSOperationQueue alloc]init];

    NSBlockOperation * operation = [NSBlockOperation blockOperationWithBlock:^{
         for (int i = 0; i<10; i++) {
            NSLog(@"+++++++++++++++++++++++++++ %@",[NSThread currentThread]);
           
        }
        
    }];

　　　　　　　　　　[queue addOperation:operation];

　　　NSBlockOperation * operation2 = [NSBlockOperation blockOperationWithBlock:^{ 　　　　　　　　　　for (int i = 0; i<10; i++) {
 NSLog(@"-------------------------------%@",[NSThread currentThread]); } }]; 

                 [queue addOperation:operation2]; 

}

NSBlockOperation默认并行,添加依赖-->串行

回到主线程(在主线程里执行)

 NSOperationQueue *mainqueue = [NSOperationQueue mainQueue];

[mainqueue addOperation:operation];