iOS--线程的创建

Posted 2020-09-23 蜗牛叔叔

1.获取当前线程

     NSThread *current=[NSThread currentThread]; 

2.获取主线程的另外一种方式

     NSThread *main=[NSThread mainThread]; 

3.创建一个新的线程
(1)直接创建

     NSThread  *thread=[[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"线程A"];
     //为线程设置一个名称
     thread.name=@"线程A";
      //开启线程
     [thread start];

(2)创建完线程自动启动

 //    NSThread *thread=[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"创建完线程直接(自动)启动"];
     [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"创建完线程直接(自动)启动"];

（3）隐式创建

      //在后台线程中执行===在子线程中执行
     [self performSelectorInBackground:@selector(run:) withObject:@"隐式创建"];