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iOS GCD定时器



//
//  ViewController.m
//  test_gcd_time_01
//
//  Created by jeffasd on 16/8/18.
//  Copyright © 2016年 jeffasd. All rights reserved.
//  GCD 定时器代码多 在这里备份下 下次直接使用

#import "ViewController.h"

@interface ViewController ()
{
    int count;
}

@property (nonatomic, strong) dispatch_source_t timer;

@end

@implementation ViewController


- (void)dealloc{
    
    dispatch_source_cancel(self.timer);
    dispatch_cancel(self.timer);
    self.timer = nil;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    dispatch_queue_t queue = dispatch_queue_create("concurrent", DISPATCH_QUEUE_CONCURRENT);
    //创建子线程中运行的GCD定时器
    self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
    dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, 0);
    uint64_t interval = (uint64_t)(3.0 * NSEC_PER_SEC);
    dispatch_source_set_timer(self.timer, start, interval, 0);
    dispatch_source_set_event_handler(self.timer, ^{
        NSLog(@"count is %d", count);
        NSLog(@"therad is %@", [NSThread currentThread]);
        count++;
    });
    dispatch_resume(self.timer);
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    NSLog(@"touch began");
    dispatch_suspend(self.timer);
    uint64_t interval = (uint64_t)(0.1 * NSEC_PER_SEC);
    dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC));
    dispatch_source_set_timer(self.timer, start, interval, 0);
    dispatch_resume(self.timer);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end




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