iOS获取时间间隔的三种方式

1.NSDate的timeIntervalSinceDate方法。

假设25秒内轮询(递归调用)某个接口：获取时间间隔小于25秒

+(void)queryData:(NSDictionary *)params withQuerySuccessComplete:(void (^)(BOOL success,DYRequestModel *model,NSError *error))complete
{
     [DYTransferManager shared].querySuccessBlock = complete;
     [DYTransferManager shared].beforeDate = [NSDate date];
    [self sendQueryRequestParams:params];
}
+(void)sendQueryRequestParams:(NSDictionary *)params{
    if (params == nil) {
        return;
    }
    DYRequest *request = [DYTransferRequestFactory queryResultRequestWithParams:params];
    [request.signal subscribeNext:^(id x) {
        DYRequestModel *requestModel = (DYRequestModel *)x;
        [DYTransferManager shared].nowDate = [NSDate date];
         int requestInterval = (int)ceil([[DYTransferManager shared].nowDate timeIntervalSinceDate:[DYTransferManager shared].beforeDate]);
        if ([requestModel.data[@"status"] isEqualToString:@"1"] && requestInterval <= 25) {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(YES,requestModel,nil);
        }
        
    } error:^(NSError *error) {
        [DYTransferManager shared].nowDate = [NSDate date];
        int requestInterval = (int)ceil([[DYTransferManager shared].nowDate timeIntervalSinceDate:[DYTransferManager shared].beforeDate]);
        if(requestInterval <= 25)
        {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(NO,nil,error);
        }
    }];
}

2.CFTimeInterval的CACurrentMediaTime()方法

static CFTimeInterval currentTimer = 0;
+(void)queryData:(NSDictionary *)params withQuerySuccessComplete:(void (^)(BOOL success,DYRequestModel *model,NSError *error))complete
{
     [DYTransferManager shared].querySuccessBlock = complete;
    [self sendQueryRequestParams:params];
}
+(void)sendQueryRequestParams:(NSDictionary *)params{
    if (params == nil) {
        return;
    }
     if (currentTimer == 0) {
        currentTimer = CACurrentMediaTime();
    }
    DYRequest *request = [DYTransferRequestFactory queryResultRequestWithParams:params];
    [request.signal subscribeNext:^(id x) {
        DYRequestModel *requestModel = (DYRequestModel *)x;
        CFTimeInterval nowTimer = CACurrentMediaTime();
        if ([requestModel.data[@"status"] isEqualToString:@"1"] && nowTimer - currentTimer <= 25) {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(YES,requestModel,nil);
        }
        
    } error:^(NSError *error) {
        CFTimeInterval nowtimer = CACurrentMediaTime();
        if(nowtimer - currentTimer <= 25)
        {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(NO,nil,error);
        }
    }];
}

3.CFAbsoluteTime的CFAbsoluteTimeGetCurrent()方法

static CFAbsoluteTime currentTimer = 0;
+(void)queryData:(NSDictionary *)params withQuerySuccessComplete:(void (^)(BOOL success,DYRequestModel *model,NSError *error))complete
{
     [DYTransferManager shared].querySuccessBlock = complete;
    [self sendQueryRequestParams:params];
}
+(void)sendQueryRequestParams:(NSDictionary *)params{
    if (params == nil) {
        return;
    }
     if (currentTimer == 0) {
        currentTimer = CFAbsoluteTimeGetCurrent();
    }
    DYRequest *request = [DYTransferRequestFactory queryResultRequestWithParams:params];
    [request.signal subscribeNext:^(id x) {
        DYRequestModel *requestModel = (DYRequestModel *)x;
        CFAbsoluteTime nowTimer = CFAbsoluteTimeGetCurrent();
        if ([requestModel.data[@"status"] isEqualToString:@"1"] && nowTimer - currentTimer <= 25) {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(YES,requestModel,nil);
        }
        
    } error:^(NSError *error) {
        CFAbsoluteTime nowtimer = CFAbsoluteTimeGetCurrent();
        if(nowtimer - currentTimer <= 25)
        {
            [self sendQueryRequestParams:params];
        }
        else
        {
            if([DYTransferManager shared].querySuccessBlock) [DYTransferManager shared].querySuccessBlock(NO,nil,error);
        }
    }];
}