[UINavigationController setGoalName:]: unrecognized selector sent to instance 0x7964e2c0

Question

I have created the app with following code. Its working fine with iOS7 but it throws the below error when I run with iOS8.

[UINavigationController setGoalName:]: unrecognized selector sent to instance 0x7964e2c0

My firstViewcontroller.m

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

GoalDetailsViewController *goalsDetailsViewController = segue.destinationViewController;
NSLog(@"%@",[NSString stringWithFormat:@"%@", [[self.arrCategoryTitle objectAtIndex:indexPath.row] objectAtIndex:indexOfCategory]]);
goalsDetailsViewController.goalName = @"Exercise Daily";

}

My GoalDetailsViewController.h

@interface GoalDetailsViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

@property (nonatomic) NSString *goalName;

Thanks in advance.

Set a breakpoint in `prepareForSegue:sender:` and examine the `destinationViewController`. It is probably not an actual instance of `GoalDetailsViewController`, and thus will not recognize the `setGoalName:` selector. My guess is that iOS 8 is sending you another view controller that you weren't expecting. — ravron, Nov 27 '14 at 18:01
It would appear that `goalsDetailsViewController` is a UINavigationController. — Hot Licks, Nov 27 '14 at 18:15

score 11 · Accepted Answer · answered Nov 27 '14 at 15:02

Seems like your destinationviewcontroller is a subclass of UINAvigationController.

Try this:

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

GoalDetailsViewController *goalsDetailsViewController = [(UINavigationController*)segue.destinationViewController topViewController];
NSLog(@"%@",[NSString stringWithFormat:@"%@", [[self.arrCategoryTitle objectAtIndex:indexPath.row] objectAtIndex:indexOfCategory]]);
goalsDetailsViewController.goalName = @"Exercise Daily";

}

YourViewController *Controller = (YourViewController*)[segue.destinationViewController topViewController]; — IKKA, Feb 01 '16 at 14:05

score 3 · Answer 2 · answered Nov 27 '14 at 18:06

The easiest way to handle this crash would be to simply make sure that the destinationViewController is of the type you're expecting before you attempt to set a property on it. Something like this:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    GoalDetailsViewController *goalsDetailsViewController = segue.destinationViewController;
    NSLog(@"%@",[NSString stringWithFormat:@"%@", [[self.arrCategoryTitle objectAtIndex:indexPath.row] objectAtIndex:indexOfCategory]]);

    if ([segue.destinationViewController isKindOfClass:[GoalDetailsViewController class]]) {
        GoalDetailsViewController *goalsDetailsViewController = segue.destinationViewController;
        goalsDetailsViewController.goalName = @"Exercise Daily";
    }
}

This change ensures that the destinationViewController is of kind GoalDetailsViewController before treating it as such.

[UINavigationController setGoalName:]: unrecognized selector sent to instance 0x7964e2c0

2 Answers2

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