How to access property from another class? - objective-c

Question

I have a newbie question. How do you access a property from another class?
In my program, I have a view in which there are three levels available: easy, intermediate and difficult. I have three buttons with tags (I'm trying stuff, so I've called those buttons: try1, try2 and try3) and I have created an int that holds the tag of the button pressed. So, the h of my first file:
#property (strong, nonatomic) IBOutlet UIButton *try3;
#property (strong, nonatomic) IBOutlet UIButton *try2;
#property (strong, nonatomic) IBOutlet UIButton *try1;
#property int level;
-(IBAction)buttonClicked:(id)sender;
the method in the m file:
- (IBAction)buttonClicked:(id)sender {
self.level = [sender tag];
NSLog(#"tag is %d", self.level);
}
Now, in my other view controller, I want to access the property "level" to change something, like so:
if (level == 0) { do somtething
}
if (level == 1) { do somtething
}
etc...

Answer 1

Assuming this second view controller was presented by the first view controller, rather than trying to access the property of the first one, the second one should have its own property for level and the first view controller should populate that second view controller's property when it presents the second view controller.
If you search Stack Overflow for "pass data between view controllers" (or variations thereof), you'll find good examples. It depends a bit upon how the second view controller is presented (e.g. if you used a segue, you set the second view controller's property in the first view controller's prepareForSegue).

Answer 2

You need to implement a custom init for your embedded viewController, for instance:
EmbeddedViewController.h
#import <UIKit/UIKit.h>
#interface EmbeddedViewController : UIViewController
- (id)initWithLevel:(int)level;
#end
EmbeddedViewController.m
#import "EmbeddedViewController.h"
#interface EmbeddedViewController ()
#end
#implementation EmbeddedViewController {
int selectedLevel;
}
- (id)initWithLevel:(int)level {
if (self = [super init]) {
selectedLevel = level;
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
You will have to use this custom init from your firstViewController:
- (IBAction)buttonClicked:(id)sender {
self.level = [sender tag];
EmbeddedViewController *evc = [[EmbeddedViewController alloc] initWithLevel:[sender tag]];
[self.navigationController pushViewController:evc animated:YES];
}