Objective c iOS passing data

Question

hi I am new to iOS and below is my code I have to pass the top that I get from request reply...please help me I am stuck here first view controller is otp view second vc is verifyviewcontroller

Otp view ch

#import <UIKit/UIKit.h>
@interface OtpViewController : UIViewController
@property (nonatomic, retain) NSString *str;
@end

otpviewcontroller.m

#import "OtpViewController.h"
#import "VerifyViewController.h"
@interface OtpViewController () <VerifyViewControllerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *bbi;
@property (weak, nonatomic) IBOutlet UIButton *submittf;
@property (weak, nonatomic) IBOutlet UITextField *mobiletf;
@property (weak,nonatomic) NSArray *tmp;
@property(weak,nonatomic) NSString *requestReply ;
//@property(weak,nonatomic) NSDictionary *A;
@end

@implementation OtpViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"background"]];
NSLog(@"viewDidLoad");
[super viewDidLoad];

}

- (IBAction)submitb:(id)sender
 {

if (_mobiletf.text && _mobiletf.text.length >0 )
{
    /* not empty - do something */
    NSString *post = [NSString stringWithFormat:@"phone=%@",_mobiletf.text];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    //  Next up, we read the postData's length, so we can pass it along in the request.

    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    // Now that we have what we'd like to post, we can create an NSMutableURLRequest, and include our postData.

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"http://www.sitesandflats.com/send_otp.php"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];
    NSLog(@"the data Details is %@", post);

    //   And finally, we can send our request, and read the reply by creating a new NSURLSession:

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
        NSLog(@"requestReply: %@", requestReply);
        NSString *str=requestReply;
        VerifyViewController *vc = [[VerifyViewController alloc] init];
        NSString  *tmp=requestReply;
        NSLog(@"%@",str);
        NSLog(@"%@",_tmp);

    }] resume];
    [ self performSegueWithIdentifier:@"b1" sender:self];
   }
else
{
    /* what ever */
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
        message:@"Please check your input!!."
        delegate:self
        cancelButtonTitle:@"OK"
        otherButtonTitles:nil];
    [alert show];
}


}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender{

VerifyViewController *loadCtr = (VerifyViewController *)segue.destinationViewController;
loadCtr.delegate = self;
loadCtr.tmpStr = (@"otp: %@",_tmp);
NSLog(@"passing val: %@",_tmp);
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}

Verify view controller.h

#import <UIKit/UIKit.h>
@protocol VerifyViewControllerDelegate <NSObject>
-(void)moveToA:(NSString *)str;
@end
@interface VerifyViewController : UIViewController
@property (nonatomic, copy) NSString *tmpStr;
@property (nonatomic, assign) id <VerifyViewControllerDelegate> delegate;
//@property (nonatomic, strong) OtpViewController *received;
//@property (strong, nonatomic) IBOutlet UITextField *textDisplay;
@property(nonatomic,weak) NSMutableArray *myAray;
@property(nonatomic,strong) NSString *object;
@property(strong,nonatomic) NSString *tmp1;
@end

Verify view controller.m

#import "VerifyViewController.h"
#import "OtpViewController.h"
@interface VerifyViewController ()
@property (weak, nonatomic) IBOutlet UITextField *otptf;
@property (weak, nonatomic) IBOutlet UIButton *submitb;
//@property (weak,nonatomic) textDisplay;
//@property (weak,nonatomic) NSString  *received;
@end


@implementation VerifyViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage     imageNamed:@"background"]];

// Do any additional setup after loading the view.
}
- (IBAction)submitb:(id)sender {
NSLog(@"%@",_tmpStr); 
if(_otptf.text==_tmpStr)
{
    [self performSegueWithIdentifier:@"b2" sender:self];
}
else{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                    message:@"Incorrect otp please check the input!!!."
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];

}


}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

at nslog I get reply as ("success":"1";"otp":"985123") I need this otp to store and verify in next page please help

Answer 1

First you need to change property

From

@property (weak,nonatomic) NSArray *tmp;

To

 @property (strong,nonatomic) NSStirng *tmp;

Assign value to tmp as below

[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
           NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; // this is json string
           NSError *error;
           NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; // you need to convert to dictionary object

            NSLog(@"requestReply: %@", jsonDict);
            self.tmp=[jsonDict valueForKey:@"otp"] ; // you need to extract value using the key   [requestReply valueForKey:@"otp"];
            NSLog(@"%@",self.tmp);

    }] resume];

Pass tmp to VerifyVIewController

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender{

VerifyViewController *loadCtr = (VerifyViewController *)segue.destinationViewController;
loadCtr.delegate = self;
loadCtr.tmpStr = self.tmp;
NSLog(@"passing val: %@",_tmp);
}