Question

I am trying to pass an object from one view controller to another but it gives an error which is

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MapViewController setTMode:]: unrecognized selector sent to instance 0x866ed70'
*** First throw call stack:
(0x250b022 0x2709cd6 0x250ccbd 0x2471ed0 0x2471cb2 0x28044 0x250ce99 0x155c14e 0x155c0e6 0x1602ade 0x1602fa7 0x1602266 0x15813c0 0x15815e6 0x1567dc4 0x155b634 0x2c0bef5 0x24df195 0x2443ff2 0x24428da 0x2441d84 0x2441c9b 0x2c0a7d8 0x2c0a88a 0x1559626 0x261d 0x2595)
terminate called throwing an exception

my method for the .h file is

@interface TransportViewController : UIViewController<UITextFieldDelegate>
{
    MapViewController *modeData;
    MapViewController *walkDistData;
    MapViewController *routeOptData;
    IBOutlet UITextField *tbMode;
    IBOutlet UITextField *tbWalkDist;
    IBOutlet UITextField *tbRouteOpt;
    IBOutlet UIPickerView *pickerView;
    NSMutableArray *modeArray;
    UITextField *activeField;
    IBOutlet UIButton *back;
}    

@property (retain, nonatomic) MapViewController *modeData;
@property (retain, nonatomic) MapViewController *walkDistData;
@property (retain, nonatomic) MapViewController *routeOptData;
@property (retain, nonatomic) IBOutlet UITextField *tbMode;
@property (retain, nonatomic) IBOutlet UITextField *tbWalkDist;
@property (retain, nonatomic) IBOutlet UITextField *tbRouteOpt;
@property (retain, nonatomic) IBOutlet UIButton *back;

- (IBAction) backAction:(id)sender;
@end

and this is the method i have for my .m file

- (void)viewDidLoad
{
    [super viewDidLoad];
    tbMode.delegate = self;
    tbWalkDist.delegate = self;
    tbRouteOpt.delegate = self;     
}
- (IBAction) backAction:(id)sender
{
    MapViewController *view=[[MapViewController alloc] initWithNibName:nil bundle:nil];
    self.modeData = view;
    self.walkDistData = view;
    self.routeOptData = view;
    // NSLog(@"%@", modeData); // this is where i test all the NSLog at
    modeData.tMode = tbMode.text;
    NSString *str = [tbWalkDist text];
    walkDistData.tWalkDist = [str intValue];
    routeOptData.tRouteOpt = tbRouteOpt.text;
    [self presentModalViewController:view animated:NO];

}

the error is caught in these lines

modeData.tMode = tbMode.text;
NSString *str = [tbWalkDist text];
walkDistData.tWalkDist = [str intValue];
routeOptData.tRouteOpt = tbRouteOpt.text;

I put a NSLog(@"%@", modeData); to check the values, it returns <MapViewController: 0x84627a0>

and NSLog(@"%@", tbMode.text); it return me the values A which is what I need.

*the error is with modeData.tMode & walkDistData.tWalkDist & routeOptData.tRouteOpt

What did I do wrong ? Please help . I can’t seem to figure this one out

My second view controller .h

@interface MapViewController : UIViewController
{
    NSString *tMode;
    NSString *tRouteOpt;
    int tWalkDist;
} 
@property(nonatomic, retain)NSString *tMode;
@property(nonatomic, retain)NSString *tRouteOpt;
@property(nonatomic)int tWalkDist;

Answer 1

You need to synthesize the tMode property in MapViewController.m:

@implementation MapViewController

@synthesize tMode;

...