- (IBAction)NSThreadBtnClick:(id)sender {

     [self threadObjectMethod];

     [self threadClassMethod];

     [self threadNSObjectMethod];

 }

 #pragma mark - 继承自NSObject的类的对象 都可以调用这个方法 只不过拿不到线程对象

 - (void)threadNSObjectMethod{

     //自动开启线程并且执行方法

     //下边的这个方法在NSObject (NSThreadPerformAdditions)里边即NSObject的分类

     [self performSelectorInBackground:@selector(NSThreadDemo:) withObject:@"NSObjectCategory"];

 }

 #pragma mark - 通过类方法创建 分离出来一个线程 不需要手动开启线程  自动开启线程并且执行方法

 - (void)threadClassMethod{

     [NSThread detachNewThreadSelector:@selector(NSThreadDemo:) toTarget:self withObject:@"classMethodThread"];

 }

 #pragma Mark- 通过对象方法来创建线程 并且需要手动启动线程

 - (void)threadObjectMethod{

     NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(NSThreadDemo:) object:@"objectMethodThread"];

     //手动启动线程

     [thread start];

 }

 - (void)NSThreadDemo:(id)obj{

     NSLog(@"传入参数%@",obj);

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

 }