多线程的四种创建方式－－前两种不常用

- (void)viewDidLoad {

    [super viewDidLoad];

 

    //1.Datach 方式，隐式创建

//    [NSThread detachNewThreadSelector:@selector(detachMethod) toTarget:self withObject:nil];

    //2.NSObject的perform方法，隐式创建

//    [self performSelectorInBackground:@selector(detachMethod) withObject:nil];

    //3.显示创建

//    NSThread *thread =[[NSThread alloc]initWithTarget:self selector:@selector(detachMethod) object:nil];

    //给线程name赋值

//    thread.name =@"thread_name";

    //在线程创建之前设置栈空间才有效

//    thread.stackSize =100;

     //线程全局数据 readOnly

//    [thread.threadDictionary setObject:@"value1" forKey:@"key1"];

    //开启线程

//    [thread start];

    方法4需要子类化一个子类

　　　　- (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument{

    

    　　　　if (self =[super initWithTarget:target selector:selector object:argument]) {

       　　 _target =target;

       　　 _sel =selector;

        

    　　　　}

   　　　　 return self;

　　　　　　}

 

 

- (void)main{

 

    if (_target) {

        //父类的main方法中，_target 会掉用_sel

        [_target performSelector:_sel withObject:nil];

    }

 

}

 

    //4.子类NSThread ，重写main方法

    Thread *thread1 =[[Thread alloc]initWithTarget:self selector:@selector(detachMethod) object:nil];

    

    [thread1 start];

}

 

- (void)detachMethod{

    //是否是主线程

    NSLog(@"%d",[NSThread isMainThread]);

    //获取当前线程，打印name

    NSLog(@"%@",[[NSThread currentThread]name]);

 

}