I have two view Controllers in my project ViewController
, SettingsView
. Here I am trying to update the ViewController's
label, when i click on the SettingsView's
back button. NSLog
is working fine, but the label is not updating...
Please help me....
SettingsView.m
-(IBAction)backToMain:(id) sender {
//calling update function from ViewController
ViewController * vc = [[ViewController alloc]init];
[vc updateLabel];
[vc release];
//close the SettingsView
[self dismissModalViewControllerAnimated:YES];
}
ViewController.m
- (void)updateLabel
{
NSLog(@"Iam inside updateLabel");
self.myLabel.text = @"test";
}
Could you please tell me whats wrong with my code? Thank you!
You have to implement protocols for that. Follow this:
1) In SettingView.h define protocol like this
@protocol ViewControllerDelegate
-(void) updateLabel;
@end
2) Define property in .h class and synthesis in .m class..
@property (nonatomic, retain) id <ViewControllerDelegate> viewControllerDelegate;
3) In SettingsView.m IBAction
-(IBAction)backToMain:(id) sender
{
[viewControllerDelegate updateLabel];
}
4) In ViewController.h adopt protocol like this
@interface ViewController<ViewControllerDelegate>
5) In viewController.m include this line in viewDidLoad
settingView.viewControllerDelegate=self
Your label is not updating because , you are trying to call updateLabel
method with a new instance.
You should call updateLabel
of the original instance of viewcontroller from which you have presented your modal view.
you can use a delegate mechansim or NSNotification to do the same.
Delegate mechnaism would be clean. NSNotification is quick and dirty.
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