最新 GCD 定时器 比NSTimer更准时的定时器

#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) dispatch_source_t timer;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    dispatch_queue_t queue = dispatch_get_main_queue();
//  dispatch_queue_t queue = dispatch_queue_create("timer", DISPATCH_QUEUE_SERIAL); // 主队列 串行队列都可以 主线程 子线程都可以
    dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
    // 需要强引用
    self.timer = timer;
    // 2秒后开始 间隔1秒
    dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 2.0 * NSEC_PER_SEC, 1.0 * NSEC_PER_SEC);
    dispatch_source_set_event_handler(timer, ^{
        NSLog(@"===");
    });
    // 开始计时
    dispatch_resume(timer);
//  dispatch_source_cancel(timer) // 取消计时器
}

 

本文地址：https://blog.csdn.net/weixin_41963895/article/details/110580656