NSOperation的监听和依赖_监听nsoperation-优快云博客

本文链接：https://blog.youkuaiyun.com/anspencer/article/details/56432056

本文介绍了一个iOS应用中处理触控事件时使用NSOperationQueue进行线程管理的例子。通过将不同操作分配到多个队列并设置操作依赖，演示了如何确保任务按预期顺序执行的同时实现异步处理。

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示例代码

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSOperationQueue *queue=[[NSOperationQueue alloc]init];
    NSOperationQueue *queue2=[[NSOperationQueue alloc]init];
    
    NSBlockOperation *op1=[NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"1---------------%@",[NSThread currentThread]);
    }];
    
    
    NSBlockOperation *op2=[NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"2---------------%@",[NSThread currentThread]);
    }];
    
    NSBlockOperation *op3=[NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"3---------------%@",[NSThread currentThread]);
    }];
    
    NSBlockOperation *op4=[NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"4---------------%@",[NSThread currentThread]);
    }];
    
    
    //操作监听
    op3.completionBlock=^{
        NSLog(@"++++done");
    };
    
    
    
    //添加操作依赖 不能循环依赖 可以跨队列依赖
    [op1 addDependency:op4];
    [op4 addDependency:op3];
    [op3 addDependency:op2];
    
    
    [queue addOperation:op1];
    [queue addOperation:op2];
    [queue addOperation:op3];
    [queue2 addOperation:op4];
    
}
@end