timer与observer在runloop中

@interface ViewController ()

@end

@implementation ViewController

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    
    [self timer1];
    
//    [self timer2];

    
    /*
    这种写法错误,因为子线程中还没runloop,子线程中的runloop要手动创建,手动开启
    [[[NSOperationQueue alloc]init] addOperationWithBlock:^{
        
        [self timer2];
    }];
     */
}

- (void)timer2
{
    //创建定时器
    //这个方法需要手动把当前的timer添加到runloop中,并且制定runloop运行模式
    NSTimer *tiemr = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(task) userInfo:nil repeats:YES];
    
    
    [[NSRunLoop currentRunLoop]addTimer:tiemr forMode:NSRunLoopCommonModes];
}


- (void)timer1
{
    //创建定时器,每隔两秒就调用task 这个方法
    //该方法内部会自动将创建的定时器对象添加到当前的runloop中,指定的运行模型为默认
    [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(task) userInfo:nil repeats:YES];
}


- (void)task
{
    NSLog(@"task---%@----%@",[NSRunLoop currentRunLoop].currentMode,[NSThread currentThread]); 
        //打印:  task---kCFRunLoopDefaultMode----<NSThread: 0x7f7fb2c04810>{number = 1, name = main}
}