CODEWITHSUNDEEP
iphone
awlcs
awlcs

Reputation: 606

change a label from another view

I have a label on my main View. I have a button which brings me to another view. On it I have a button to change my label which is on the main view.

How can I do this? I included a projet, could someone help me please...

Upvotes: 1

Views: 817

Answers (2)

shannoga
shannoga

Reputation: 19869

I usually use a delegate protocol:

in the second view h add :

@protocol viewControllerDelegate;

@interface viewController : UIView  

id < viewControllerDelegate > delegate;  
@property (nonatomic, assign) id < QuickViewControllerDelegate > delegate;

@end

@protocol viewControllerDelegate

- (void)viewController:(ViewController *)controller stringForLabel:(NSString*)string; 

@end

in the second view m file call:

[delegate quickViewController:self
stringForLabel:@"your string"];

in the main view h file add: , like that:

 @interface MainView:UIViewController<viewControllerDelegate>

in the main view m file:

first: when you init the second view don't forget to add:

secondview.delegate = self;

other wise it wont work.

second: add the delegate function:

 - (void)viewController:(ViewController*)controller stringForLabel:(NSString*)string{

    //set the label from the string passed

    lable.text = string;

    }

hope it will help shani

Upvotes: 5

shannoga
shannoga

Reputation: 19869

O.K i usually don't do that but for now...

this are your files after i have change them -

View1 .h (try to name those files with a capital letter);

 #import <UIKit/UIKit.h>

@protocol View1Delegate;


@interface View1 : UIViewController {

    id <View1Delegate> delegate;
    IBOutlet UIButton *btn_changelbl;
    IBOutlet UIButton *btn_back;
}

@property (nonatomic, assign) id <View1Delegate> delegate;
@property (nonatomic,retain) IBOutlet UIButton *btn_changelbl;
@property (nonatomic,retain) IBOutlet UIButton *btn_back;

-(IBAction) backToMain:(id)sender;
-(IBAction) changeLabel:(id)sender;
@end


@protocol View1Delegate 
- (void)view1:(View1*)controller labelNeedsChage:(BOOL)needsChange stringForLabel:(NSString*)string;

@end

View1.m

#import "View1.h"
#import "testViewController.h"

@implementation View1
@synthesize delegate;
@synthesize btn_changelbl;
@synthesize btn_back;

-(IBAction) backToMain:(id)sender {
    [self dismissModalViewControllerAnimated:YES];
    [delegate view1:self labelNeedsChage:NO stringForLabel:nil];

}

-(IBAction) changeLabel:(id)sender{
    [delegate view1:self labelNeedsChage:YES stringForLabel:@"new text"];
    [self dismissModalViewControllerAnimated:YES];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];

}


- (void)dealloc {
    [btn_changelbl release];
    [btn_back release];
    [super dealloc];
}


@end

TestViewController.h

#import <UIKit/UIKit.h>
#import "View1.h"

@interface testViewController : UIViewController<View1Delegate> {

    IBOutlet UILabel *lb_test;
    IBOutlet UIButton *btn_changeView;

}

@property (nonatomic,retain) IBOutlet UILabel *lb_test;
@property (nonatomic,retain) IBOutlet UIButton *btn_changeView;

-(IBAction) changeView:(id)sender;
@end

TestViewController.m

#import "testViewController.h"
#import "view1.h"

@implementation testViewController

@synthesize lb_test;
@synthesize btn_changeView;

-(IBAction) changeView:(id)sender {
    View1 *myView = [[View1 alloc] init];
    myView.delegate=self;
    [self presentModalViewController:myView animated:YES];
}


- (void)view1:(View1*)controller labelNeedsChage:(BOOL)needsChange stringForLabel:(NSString*)string{
    if(needsChange){
        lb_test.text=string;
    }

}


- (void)dealloc {
    [lb_test release];
    [btn_changeView release];
    [super dealloc];
}

@end

Thats it. by the way: you had many small mistakes that i have fixed. look at the fixes to try to understand them.

Upvotes: 3

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