从不同的 class 访问插座

Question

So heres my issue. I assume its a simple one but i just cannot figure out why this is not working.

I need to access Outlets (UITextField, UITableView, UIActivityIndicatorView, etc.) in one class (RootViewController) from a different class (ServiceController).

I have this currently (only showing whats need):

RootViewController.h

@interface RootViewController : UIViewController{
    UITextField *textField;
}

@property (nonatomic, retain) IBOutlet UITextField *textField;

- (void)startService;

@end

RootViewController.m

@implementation RootViewController

@synthesize textField;

- (void)startService{
    ServiceController *service = [[ServiceController alloc] init];
    [service start];
    [service release];
}

@end

ServiceController.h

@class RootViewController;

@interface ServiceController : NSObject{
}

@property (nonatomic, retain) IBOutlet RootViewController *rootViewController;

- (void)start;

@end

ServiceController.m

#import "RootViewController.h"

@implementation ServiceController

@synthesize rootViewController;

- (void)start{
    [((RootViewController*)rootViewController).textField setText:@"HELLO !"];
    NSLog(@"CALLED !");
}

@end

I do not see why this is not working, i use the same method to do the same thing from the RootViewController to the DetailViewController and it works fine. I checked to see if there were any other declaration in the detail/root controllers to allow that to work but i did not notice any.

PS: everything is being called successfully and "CALLED," is being logged. just whatever i do to the outlet(s) has no effect.

Answer 1

It looks like you didn't set the rootViewController . Try adding:

ServiceController *service = [[ServiceController alloc] init];

// set the property here
[service setRootViewController:self];

[service start];
[service release];

Answer 2

Your ServiceController needs to have its rootViewController property set. You can either do this in an XIB file or explicitly in code:

myServiceController.rootViewController = myRootViewController;