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1 #import "ViewController.h" 2 3 @interface ViewController () 4 @property (nonatomic, strong) dispatch_source_t timer; 5 @end 6 7 @implementation ViewController 8 9 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ 10 [self gcdTimer]; 11 } 12 13 14 /** 15 GCD定时器 16 */ 17 -(void)gcdTimer{ 18 19 20 /** 21 DISPATCH_SOURCE_TYPE_TIMER 定时器 22 0 描述信息 23 0 更详细的描述信息 24 dispatchQueue ： 队列决定定时器任务在哪个线程 25 */ 26 // dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_main_queue()); 27 dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_global_queue(0, 0)); 28 29 /* 30 DISPATCH_TIME_NOW :起始时间 31 intervalInSeconds 间隔时间 32 leewayInSeconds 精准度， 绝对精准0 33 */ 34 dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 2 * NSEC_PER_SEC, 0 * NSEC_PER_SEC); 35 36 /* 37 定时器任务 38 */ 39 dispatch_source_set_event_handler(timer, ^{ 40 NSLog(@"=== %@", [NSThread currentThread]); 41 }); 42 dispatch_resume(timer); 43 44 /* 45 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， 46 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 47 */ 48 49 self.timer = timer; 50 } 51 52 -(void)runloopTimer{ 53 NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(runTimer) userInfo:nil repeats:YES];// 在主线程 54 55 // NSRunLoopCommonModes:会同时执行默认模式（NSDefaultRunLoopMode）和界面追踪模式（UITrackingRunLoopMode） 56 [[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopMode]; // 等价于 CFRunLoopAddTimer （参数1，参数2，参数3） 57 } 58 - (void)runloopTimer22{ 59 NSRunLoop *runloop = [NSRunLoop currentRunLoop]; 60 61 /** 62 默认是NSDefaultRunLoopMode 63 */ 64 [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(runTimer) userInfo:nil repeats:YES]; 65 [runloop run]; 66 } 67 68 69 -(void)runTimer{ 70 NSLog(@"===%@====",[NSThread currentThread]); 71 } 72 73 -(void)runLoop{ 74 //主线程runloop 75 NSRunLoop *mainRunloop = [NSRunLoop mainRunLoop]; 76 NSLog(@"mainRunloop =========== %p", mainRunloop); 77 // NSLog(@"mainRunloop 是个啥 === %@", mainRunloop);//打印一坨东西看不明白 78 79 //当前线程runloop 80 NSRunLoop * currentRunLoop = [NSRunLoop currentRunLoop]; 81 NSLog(@"currentRunLoop ======== %p", currentRunLoop); 82 83 //core 84 NSLog(@"CFRunLoopGetMain ====== %p", CFRunLoopGetMain()); 85 NSLog(@"CFRunLoopGetCurrent === %p", CFRunLoopGetCurrent()); 86 87 //转换 88 NSLog(@"mainRunloop.getCFRunLoop === %p", mainRunloop.getCFRunLoop); 89 NSLog(@"currentRunLoop .getCFRunLoop === %p", currentRunLoop.getCFRunLoop); 90 /* 91 2018-07-06 13:52:44.552563+0800 10 - runloop[12596:484429] mainRunloop =========== 0x6040000a2be0 92 2018-07-06 13:52:44.552908+0800 10 - runloop[12596:484429] currentRunLoop ======== 0x6040000a2be0 93 2018-07-06 13:52:44.553043+0800 10 - runloop[12596:484429] CFRunLoopGetMain ====== 0x6000001f3600 94 2018-07-06 13:52:44.553121+0800 10 - runloop[12596:484429] CFRunLoopGetCurrent === 0x6000001f3600 95 */ 96 } 97 98 99 100 @end