runloop(PreformSelector方法运用)

@interface ViewController ()
@end

@implementation ViewController

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    
    [NSThread detachNewThreadSelector:@selector(run) toTarget:self withObject:nil];
    
    
    //同样开启的是子线程
//   NSThread *r = [[NSThread alloc]initWithTarget:self selector:@selector(run) object:nil];
//    [r start];
    
}


- (void)run
{
    
    NSLog(@"run----%@",[NSThread currentThread]);
    
    
    //为什么没执行task :注意这个方法虽然内部会自动加入runloop中,但这条子线程中的runloop还没开启,子线程中的runloop是需要手动开启的
 //该方法内部自动将performSelector 事件添加到当前的runloop中,指定的运行模式为默认
    [self performSelector:@selector(task) withObject:nil afterDelay:1.0];
    
    //开启runloop
    [[NSRunLoop currentRunLoop]run];
}


- (void)task
{
    
    NSLog(@"task----%@",[NSThread currentThread]); //子线程
}