ios 时间显示时 当前时间同步服务器时间

RCDateTimeUtils.h文件

#import@interface RCDateTimeUtils : NSObject

@property(nonatomic,assign)NSTimeInterval timeIntevalDifference;

+(void)updateServerTime:(NSTimeInterval)timestamp;

+ (NSDate*)currentTime ;

+(RCDateTimeUtils*)sharedInstance;

@end

//RCDateTimeUtils.h文件

#import "RCDateTimeUtils.h"

@implementation RCDateTimeUtils

//创建单例

+(RCDateTimeUtils*)sharedInstance{

static RCDateTimeUtils *manager=nil;

static dispatch_once_t token;

dispatch_once(&token,^{

if(manager == nil){

manager = [[RCDateTimeUtils alloc]init];

}

} );

return manager;

}

//计算时间差

+(void)updateServerTime:(NSTimeInterval)timestamp {

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

[outputFormatter setLocale:[NSLocale currentLocale]];

[outputFormatter setDateFormat:@"YYYYMMddHHmmss"];

NSTimeInterval interval = [[NSDate date] timeIntervalSince1970];

NSTimeInterval timeInteval =timestamp - interval;

NSLog(@"_%f",timeInteval);

[RCDateTimeUtils sharedInstance].timeIntevalDifference = timeInteval;

}

//本地时间与服务器时间同步

+ (NSDate*)currentTime {

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

[outputFormatter setLocale:[NSLocale currentLocale]];

[outputFormatter setDateFormat:@"YYYYMMddHHmmss"];

NSDate *dateT=[NSDate date];

NSTimeInterval interval = [dateT timeIntervalSince1970];

interval+=[self sharedInstance].timeIntevalDifference;

dateT = [NSDate dateWithTimeIntervalSince1970:interval];

return dateT;

}