OC 时间比较

当前时间大于等于预定时间，即请求下面接口，反之请求另外接口，代码贴在下面，粘贴上自己代码就可以使用：

- (void)viewDidLoad {

    [super viewDidLoad];

    NSDate*currentDate = [NSDatedate];

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

    [dateFormattersetDateFormat:@"YYYY-MM-dd"];

    NSString* currentDateStr = [dateFormatterstringFromDate:currentDate];

    intcomparisonResult = [selfcompareDate:currentDateStrwithDate:@"自己定义个时间"];

    if(comparisonResult >0){

        //endDate 大

        [self jsusWebView];

    }else{

        [self requestMainURL];

    }

    // Do any additional setup after loading the view from its nib.

}

//比较两个日期大小

-(int)compareDate:(NSString*)startDate withDate:(NSString*)endDate{

    intcomparisonResult;

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

    [formattersetDateFormat:@"yyyy-MM-dd"];

    NSDate *date1 = [[NSDate alloc] init];

    NSDate *date2 = [[NSDate alloc] init];

    date1 = [formatterdateFromString:startDate];

    date2 = [formatterdateFromString:endDate];

    NSComparisonResultresult = [date1compare:date2];

    NSLog(@"result==%ld",(long)result);

    switch(result)

    {

            //date02比date01大

        case NSOrderedAscending:

            comparisonResult =1;

            break;

            //date02比date01小

        case NSOrderedDescending:

            comparisonResult = -1;

            break;

            //date02=date01

        case NSOrderedSame:

            comparisonResult =0;

            break;

        default:

            NSLog(@"erorr dates %@, %@", date1, date2);

            break;

    }

    returncomparisonResult;

}