Passing values from second view to firstView in Xcode

Question

I have been stuck here.

I have a NSString in Appdelegate. And I have two views called firstview,second view.In first view I have a label and set text from stringvari

Answer 1

There is a pattern how to do such things. You should define a protocol like this:

@protocol FirstViewDelegate <NSObject>

- (void)didDismissSecondView;

@end

Your first view should conform to this protocol:

@interface FirstView: UIViewController <FirstViewDelegate> {
...

in its implementation add function didDismissSecondView:

- (void) didDismissSecondView
{
    AppDelegate *del = [[UIApplication sharedApplication] delegate];

    [btn setTitle:del.str1];
}

Your second view has to have a property

@interface SecondView : UIViewController
{
     id<FirstViewDeledate> delegate;
}
@property (nonatomic, retain) id<FirstViewDeledate> delegate;

When you show your second view from the first view set its delegate to self of first view in your function:

-(IBAction)gotoView2:(id)sender
{
    SecondView *aView = [[SecondView alloc] init] // or whatever
    ...//other initialization code
    aView.delegate = self;
    ... // show it

}

and before you dismiss the second view:

-(IBAction)gotoView1:(id)sender
{

    AppDelegate *del = [[UIApplication sharedApplication] delegate];
    [del setStr1:@"Home"];

    [self.delegate didDismissSecondView];

    [self.view removeFromSuperView];
}

And you done. A bit long, but works.