Check for internet Connection- with UIAlertview -Ios

- (void)viewDidLoad {

    [super viewDidLoad];

    

    Reachability *networkReachability = [Reachability reachabilityForInternetConnection];

    NetworkStatus networkStatus = [networkReachability currentReachabilityStatus];

    if (networkStatus == NotReachable) {

        // NSLog(@"There IS NO internet connection");

        

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Opps!!"

                                                        message:@"you may need to check your network Conenction.."

                                                       delegate:self

                                              cancelButtonTitle:@"Settings"

                                              otherButtonTitles:@"Cancel",nil];

        [alert show];

        

        

        

        

        

    } else {

        

        loadingIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(100, 100, 50,50)];

        [loadingIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];

        [loadingIndicator setHidesWhenStopped:YES];

        [self registerCells];

        [self loadData];

        

    }

    

    // Do any additional setup after loading the view.

}

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {

    // the user clicked OK

    if (buttonIndex == 0) {

        NSURL*url=[NSURL URLWithString:@"prefs:root=WIFI"];

        [[UIApplication sharedApplication] openURL:url];

        [self.navigationController popViewControllerAnimated:YES];

        

    }

    if (buttonIndex == 1) {

        [self.navigationController popViewControllerAnimated:YES];

        

    }

}

Compare Two dates- ios

- (void)viewDidLoad {

    [super viewDidLoad];

    

    

    

    

    NSDate *todayDate = [NSDate date]; // get today date

    NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc] init]; // here we create      NSDateFormatter object for change the Format of date..

    [dateFormatter2 setDateFormat:@"yyyy-MM-dd hh:mm:ss Z"]; //Here we can set the format which we need

    NSString *convertedDateString = [dateFormatter2 stringFromDate:todayDate];// here convert date in

  NSLog(@"Today formatted date is %@",convertedDateString);

    

    

    

    

    

    NSString *getTokon_Time1 = @"2016-07-20 03:19:05 +0000";

   // NSString *getTokon_Time2 = @"2016-07-31 03:18:05 +0000";

    NSDateFormatter *dateFormatter=[NSDateFormatter new];

    [dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm:ss Z"];

    NSDate *tokonExpireDate1=[dateFormatter dateFromString:getTokon_Time1];

    NSDate *tokonExpireDate2=[dateFormatter dateFromString:convertedDateString];

    BOOL isTokonValid = [self dateComparision:tokonExpireDate1 andDate2:tokonExpireDate2];

    

    

    // Do any additional setup after loading the view.

}

-(BOOL)dateComparision:(NSDate*)date1 andDate2:(NSDate*)date2{

    

    BOOL isTokonValid;

    

    if ([date1 compare:date2] == NSOrderedDescending) {

        NSLog(@"date1 is later than date2");

        

        

        

        isTokonValid = YES;

        

        

        

    } else if ([date1 compare:date2] == NSOrderedAscending) {

        NSLog(@"date1 is earlier than date2");

        isTokonValid = NO;

        

        

      

    } else {

        NSLog(@"dates are the same");

        isTokonValid = NO;

        

    }

    

    return isTokonValid;

}