iOS 多线程倒计时

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在项目中,我们经常遇到有一个过期的时间,而这个过期的时间点后台又没有给,只给了个开始时间,因此我们需要自己去计算解决这个过期问题了.

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//倒计时相关代码

NSInteger orderTime = [TimeHandelTool timeSwitchTimestamp:model.OrderTime andFormatter:@"YYYY-MM-dd hh:mm"];

NSLog(@"%ld",orderTime);

NSInteger nowTime = [TimeHandelTool getNowTimestamp];

NSLog(@"%ld",nowTime);

__block NSInteger timeCha = nowTime - orderTime;

NSInteger overdue = 24 * 60 * 60;//过期时间24小时

__block NSInteger leftTime = overdue - timeCha;

if (!(timeCha < overdue)) {

self.leftTimeLabel.text = @"超过支付时间";

self.payButton.enabled = NO;

}else {

//倒计时

self.payButton.enabled = YES;

//获取全局队列

dispatch_queue_t global = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

//创建一个定时器，并将定时器的任务交给全局队列执行(并行，不会造成主线程阻塞)

dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, global);

// 设置触发的间隔时间

dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 1.0 * NSEC_PER_SEC, 0 * NSEC_PER_SEC);

//1.0 * NSEC_PER_SEC  代表设置定时器触发的时间间隔为1s

//0 * NSEC_PER_SEC    代表时间允许的误差是 0s

//block内部 如果对当前对象的强引用属性修改 应该使用__weak typeof(self)weakSelf 修饰  避免循环调用

__weak typeof(self)weakSelf = self;

//设置定时器的触发事件

dispatch_source_set_event_handler(timer, ^{

leftTime --;

if (leftTime <= 0) {

//关闭定时器

dispatch_source_cancel(timer);

weakSelf.leftTimeLabel.text = @"超过支付时间";

weakSelf.payButton.enabled = NO;

//MRC下需要释放，这里不需要

// dispatch_realse(timer);

dispatch_async(dispatch_get_main_queue(), ^{

[weakSelf.leftTimeLabel setText:@"超过支付时间"];

});

}else {

//主线程修改UI

weakSelf.payButton.enabled = YES;

dispatch_async(dispatch_get_main_queue(), ^{

NSInteger hour = leftTime / 3600;

NSInteger min = (leftTime - hour * 3600)/60;

NSString * title = [NSString stringWithFormat:@"%ld小时%ld分钟",hour,min];

weakSelf.leftTimeLabel.text = title;

});

}

});

dispatch_resume(timer);

}

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时间处理的相关代码

对时间相关的进行封装,一个项目里面有可能其他地方也会用到

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.h文件代码如下

#import@interface TimeHandelTool : NSObject

//获取当前时间的 时间戳

+(NSInteger)getNowTimestamp;

//将某个时间转化成 时间戳

+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format;

//将某个时间戳转化成 时间

+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format;

@end

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.m文件

#import "TimeHandelTool.h"

@implementation TimeHandelTool

#pragma mark - 获取当前时间的 时间戳

+(NSInteger)getNowTimestamp{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ----------设置你想要的格式

//设置时区

NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate *datenow = [NSDate date];//现在时间

//时间转时间戳的方法:

NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

NSLog(@"设备当前的时间戳:%ld",(long)timeSp); //时间戳的值

return timeSp;

}

//将某个时间转化成 时间戳

#pragma mark - 将某个时间转化成 时间戳

+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式

NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate

//时间转时间戳的方法:

NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];

return timeSp;

}

//将某个时间戳转化成 时间

#pragma mark - 将某个时间戳转化成 时间

+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format]; // （@"YYYY-MM-dd hh:mm:ss"）----------设置你想要的格式

NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];

NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

return confromTimespStr;

}