Simple counting app crushes

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0

I'm new to Obj-C and trying to make simple counting application.

There is my code for increase and decrease the count. Button 'plus1' is working well, but the others are crushing my app.

-(IBAction)plus1 {
    lifeCounter += 1;
    self.lifeCount2.text = [NSString stringWithFormat:@"%i", lifeCounter];
}

- (IBAction)minus1 {
    lifeCounter -= 1;
    self.lifeCount2.text = [NSString stringWithFormat:@"%i", lifeCounter];
}

- (IBAction)plus51 {
    lifeCounter = lifeCounter + 5;
    self.lifeCount2.text = [NSString stringWithFormat:@"%i", lifeCounter];
}

- (IBAction)minus51 {
    lifeCounter = lifeCounter - 5;
    self.lifeCount2.text = [NSString stringWithFormat:@"%i", lifeCounter];
}

I receive: 'libc++abi.dylib: terminating with uncaught exception of type NSException'.

asked 24 secs ago

user3674503

1