(iOS) crash when view controller property is set - ios

Question

I've problems passing data to a new view controller.
I've two VC. In the "FirstVC" there is a table view with dynamic prototypes cells. The generic cell contains a label and a button and it's assigned to its own class "GenericCell". I want to pass to the SecondVC the text of the cell label when I press the button, but the app crashes with errors:
Unknown class _TtC13testTableView37SecondVC in Interface Builder file.
UIViewController setMyString:]: unrecognized selector sent to instance 0x7fa05e418110
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController setMyString:]: unrecognized selector sent to instance 0x7fc8add05710
I tried:
To use the segue (with prepareForSegue method) outside the getText method
1a. Pushing the VC from the outside of the getText method
Implementing and calling set/get method of myString
Adding attributes to myString property
but the app crashes the same.
GenericCell.h
#import <UIKit/UIKit.h>
#protocol MyCellDelegate
-(void)getText:(NSString *)text;
#end
#interface GenericCell: UITableViewCell
#property (weak, nonatomic) IBOutlet UILabel * label;
#property (assign, nonatomic) id <MyCellDelegate> delegate;
#end
GenericCell.m
#import "GenericCell.h"
#interface GenericCell()
#end
#implementation GenericCell
- (IBAction)buttonPressed {
if (self.delegate) {
[self.delegate getText:self.label.text];
}
}
#end
FirstVC.m
#import "FirstVC.h"
#import "GenericCell.h"
#import "SecondVC.h"
#interface FirstVC() <UITableViewDataSource,UITableViewDelegate, MyCellDelegate>
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#property NSString * idToPass;
#end
#implementation FirstVC
NSMutableArray<NSString *> *array;
- (void)viewDidLoad {
array = [[NSMutableArray alloc]initWithObjects:#"0x22", #"0x11", #"0x24", nil];
[super viewDidLoad];
self.tableView.dataSource=self;
self.tableView.delegate=self;
self.tableView.rowHeight=100;
}
-(void)getText:(NSString *)text {
self.idToPass = text;
SecondVC * secondVC = [self.storyboard instantiateViewControllerWithIdentifier:#"SecondVC"];
secondVC.myString = self.idToPass;
[[self navigationController] pushViewController:secondVC animated:YES];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return array.count;
}
- (GenericCell *)tableView:(nonnull UITableView *)tableView cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath {
GenericCell * cell = [[self tableView]dequeueReusableCellWithIdentifier:#"GenericCell" forIndexPath:indexPath];
cell.delegate = self;
cell.label.text = [array objectAtIndex:indexPath.row];
return cell;
}
#end
SecondVC.h
#import <UIKit/UIKit.h>
#interface SecondVC : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *label;
#property NSString * myString;
#end
SecondVC.m
#import "SecondVC.h"
#interface SecondVC ()
#end
#implementation SecondVC
- (void)viewDidLoad {
self.label.text = self.myString;
[super viewDidLoad];
}
#end
The "idToPass" is set correctly with delegation.

Answer 1

This work for me: in the buttonPressed method update the if statement like this
if ([self.delegate respondsToSelector:#selector(getText:)]){
[self.delegate getText:self.label.text];
}
Another option to give SecondVC the data is using
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
SecondVC * vc = segue.destinationViewController;
if ([segue.identifier isEqualToString: #"yourSegue"]) {
vc.myString = self.idToPass;
}
}
A tip I suggest is to check (with a simple if statement) if your object in SecondVC is nil or !nil
I hope this help :)

Answer 2

In getText method you assign text to myProperty instead myString...
It should be:
secondVC.myString = self.idToPass;