ios开发多线程一：了解-NSOperation的基本使用

#import "viewcontroller.h" @interface viewcontroller ()@end @implementation viewcontroller-(void)touchesbegan:(nsset<uitouch *> *)touches withevent:(uievent *)event {
    [self blockoperation];
}/**
 *    1:nsoperation封装任务的两种方式：nsinvocationoperation，nsblockoperation，其中两种方法若没指定队列，则默认是在主队列里去执行
 2:住家任务：addexecutionblock：
 注意:如果一个操作中的任务数量大于1,那么会开子线程并发执行任务
 
 注意:不一定是子线程,有可能是主线程
 */ -(void)invocationopeation
{
    
    //1.创建操作,封装任务     /*      第一个参数:目标对象 self
     第二个参数:调用方法的名称
     第三个参数:前面方法需要接受的参数 nil
     */      nsinvocationoperation *op1 = [[nsinvocationoperation alloc]initwithtarget:self selector:@selector(download1) object:nil];
     nsinvocationoperation *op2 = [[nsinvocationoperation alloc]initwithtarget:self selector:@selector(download2) object:nil];
     nsinvocationoperation *op3 = [[nsinvocationoperation alloc]initwithtarget:self selector:@selector(download3) object:nil];
    
    //2.启动|执行操作      [op1 start];
     [op2 start];
     [op3 start];
}-(void)blockoperation
{
    //1.创建操作     nsblockoperation *op1 = [nsblockoperation blockoperationwithblock:^{
        nslog(@"1----%@",[nsthread currentthread]);
    }];
    
    nsblockoperation *op2 = [nsblockoperation blockoperationwithblock:^{
        nslog(@"2----%@",[nsthread currentthread]);
    }];
    
    nsblockoperation *op3 = [nsblockoperation blockoperationwithblock:^{
        nslog(@"3----%@",[nsthread currentthread]);
    }];
    
    //追加任务
    //注意:如果一个操作中的任务数量大于1,那么会开子线程并发执行任务
    //注意:不一定是子线程,有可能是主线程     [op3 addexecutionblock:^{
        nslog(@"4---%@",[nsthread currentthread]);
    }];
    
    [op3 addexecutionblock:^{
        nslog(@"5---%@",[nsthread currentthread]);
    }];
    
    [op3 addexecutionblock:^{
        nslog(@"6---%@",[nsthread currentthread]);
    }];
    
    //2.启动     [op1 start];
    [op2 start];
    [op3 start];
}-(void)download1
{
    nslog(@"%s----%@",__func__,[nsthread currentthread]);
}-(void)download2
{
    nslog(@"%s----%@",__func__,[nsthread currentthread]);
}-(void)download3
{
    nslog(@"%s----%@",__func__,[nsthread currentthread]);
}@end