runloop 和 CFRunLoop - 定时器 - NSTimer 和 GCD定时器

1.

2、

 #import "ViewController.h"

 @interface ViewController ()
 @property (nonatomic, strong) dispatch_source_t timer;
 @end

 @implementation ViewController

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

 /**
  GCD定时器
  */
 -(void)gcdTimer{

     /**
       DISPATCH_SOURCE_TYPE_TIMER 定时器
       0 描述信息
       0 更详细的描述信息
       dispatchQueue ： 队列决定定时器任务在哪个线程
      */
 //    dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_main_queue());
     dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, , , dispatch_get_global_queue(, ));

     /*
      DISPATCH_TIME_NOW :起始时间
      intervalInSeconds 间隔时间
      leewayInSeconds 精准度， 绝对精准0
      */
     dispatch_source_set_timer(timer, DISPATCH_TIME_NOW,  * NSEC_PER_SEC,  * NSEC_PER_SEC);

     /*
      定时器任务
      */
     dispatch_source_set_event_handler(timer, ^{
         NSLog(@"=== %@", [NSThread currentThread]);
     });
     dispatch_resume(timer);

     /*
      此时 定时器不会工作， 因为定时器有可能被释放掉了，异步线程和主线程都不会执行 ，需要强引用， strong，
      GCD定时器是绝对精准的，拖拽tableview或者textview都会执行，NSTimer 分界面追踪模式和默认模式
      */

     self.timer = timer;
 }

 -(void)runloopTimer{
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: target:self selector:@selector(runTimer) userInfo:nil repeats:YES];// 在主线程

     // NSRunLoopCommonModes:会同时执行默认模式（NSDefaultRunLoopMode）和界面追踪模式（UITrackingRunLoopMode）
     [[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopMode]; // 等价于 CFRunLoopAddTimer （参数1，参数2，参数3）
 }
 - (void)runloopTimer22{
     NSRunLoop *runloop = [NSRunLoop currentRunLoop];

     /**
      默认是NSDefaultRunLoopMode
      */
     [NSTimer scheduledTimerWithTimeInterval: target:self selector:@selector(runTimer) userInfo:nil repeats:YES];
     [runloop run];
 }

 -(void)runTimer{
     NSLog(@"===%@====",[NSThread currentThread]);
 }

 -(void)runLoop{
     //主线程runloop
     NSRunLoop *mainRunloop = [NSRunLoop mainRunLoop];
     NSLog(@"mainRunloop =========== %p", mainRunloop);
     //    NSLog(@"mainRunloop 是个啥 === %@", mainRunloop);//打印一坨东西看不明白

     //当前线程runloop
     NSRunLoop * currentRunLoop = [NSRunLoop currentRunLoop];
     NSLog(@"currentRunLoop ======== %p", currentRunLoop);

     //core
     NSLog(@"CFRunLoopGetMain ====== %p", CFRunLoopGetMain());
     NSLog(@"CFRunLoopGetCurrent === %p", CFRunLoopGetCurrent());

     //转换
     NSLog(@"mainRunloop.getCFRunLoop  === %p", mainRunloop.getCFRunLoop);
     NSLog(@"currentRunLoop .getCFRunLoop  === %p", currentRunLoop.getCFRunLoop);
     /*
      2018-07-06 13:52:44.552563+0800 10 - runloop[12596:484429] mainRunloop =========== 0x6040000a2be0
      2018-07-06 13:52:44.552908+0800 10 - runloop[12596:484429] currentRunLoop ======== 0x6040000a2be0
      2018-07-06 13:52:44.553043+0800 10 - runloop[12596:484429] CFRunLoopGetMain ====== 0x6000001f3600
      2018-07-06 13:52:44.553121+0800 10 - runloop[12596:484429] CFRunLoopGetCurrent === 0x6000001f3600
      */
 }

 @end