passing data to a view controller - ios

Question

Here is my button function where I pass the data.
The problem is Area and Country details are passed to the next ViewController but latitude and longitude return null.
In ViewController.m :
- (IBAction)forecast:(UIButton *)sender
{
ForecastViewController *sendDetails = [[ForecastViewController alloc] init];
NSArray *seperate = [full componentsSeparatedByString:#", "];
Area = seperate[0];
Country = seperate[1];
sendDetails.Area = Area;
sendDetails.Country = Country;
NSLog(#"%#%#",self.longitude,self.latitude);
NSString *lt = self.latitude;
NSString *ln = self.longitude;
sendDetails.longitude = lt;
sendDetails.latitude = ln;
}
In ForecastViewController.h
//
// ForecastViewController.h
// Weather App
//
// Created by Mac-Mini-2 on 10/02/16.
// Copyright © 2016 Mac-Mini-2. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#import <Reachability.h>
#interface ForecastViewController : UIViewController <UITableViewDataSource,UITableViewDelegate>
#property (weak, nonatomic) IBOutlet UILabel *place;
#property (weak, nonatomic) IBOutlet UITableView *table;
#property (weak, nonatomic) IBOutlet UIActivityIndicatorView *activityIndicator;
#property NSString *Area;
#property NSString *Country;
#property NSString *latitude;
#property NSString *longitude;
#end
In ForecastViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.table.delegate = self;
self.table.dataSource = self;
self.place.text = [NSString stringWithFormat:#"%#, %#",self.Area,self.Country];
locationName = [NSString stringWithFormat:#"%#, %#",self.Area,self.Country];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
metric = [defaults boolForKey:#"metric"];
Reachability *reach = [Reachability reachabilityWithHostName:#"www.google.com"];
NSInteger x = [reach currentReachabilityStatus];
if (x > 0)
{
reachable = YES;
NSLog(#"%#, %#",self.latitude,self.longitude);
[self getForecast:self.latitude longitudes:self.longitude];
}
else
{
reachable = NO;
[self getData];
errorMsg = #"Because of unavailability of Network Realtime information wont be available.";
[self performSelectorOnMainThread:#selector(displayAlert) withObject:NULL waitUntilDone:YES];
}
[reach startNotifier];
}
Please let me know where I could have gone wrong here.
I checked by logging the data onto console. The area and country is printed but longitude and latitude give null values.

Answer 1

if you are doing a push to ForecastViewController, maybe implementing prepareForSegue:sender: is your best option.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"viewForecast"]){
NSArray *seperate = [full componentsSeparatedByString:#", "];
Area = seperate[0];
Country = seperate[1];
[(ForecastViewController *) [segue destinationViewController] setArea:area];
[(ForecastViewController *) [segue destinationViewController] setCountry:country];
...
...
}
}

Answer 2

Could I the that latitude and longitude are stored as numbers in the first controller? Are you sure that 'sendDetails.latitude' and 'longitude' are set correctly in 'ViewController'?

Answer 3

I think you need to edit two point firstly in ForecastViewController.h set
#property (Strong, nonatomic) NSString *Area;
#property (Strong, nonatomic) NSString *Country;
#property (Strong, nonatomic) NSString *latitude;
#property (Strong, nonatomic) NSString *longitude;
and #synthsize it in ForecastViewController.m.
secondly:-
- (IBAction)forecast:(UIButton *)sender
{
ForecastViewController *sendDetails = [self.storyboard instantiateViewControllerWithIdentifier:#"your ForecastViewController name in storyboard"];
NSArray *seperate = [full componentsSeparatedByString:#", "];
Area = seperate[0];
Country = seperate[1];
sendDetails.Area = Area;
sendDetails.Country = Country;
NSLog(#"%#%#",self.longitude,self.latitude);
NSString *lt = self.latitude;
NSString *ln = self.longitude;
sendDetails.longitude = lt;
sendDetails.latitude = ln;
[self.navigationController pushViewController:sendDetails animated:YES];
}