How to call a method and set a variable from subview?

[tester]

hi all,
i have a viewcontroller, im adding a subviewcontroller to it. this subviewcontroller use a subview (subclassed UIView). there is a button in subview.
if the user press the button, i want to set a varibale in Mainviewcontroller, then call RefreshPage method.

layout:
MainViewController;
NSINteger xyzID;
-(void) RefreshPage;

i add subViewController in viewdidload method.

	subVC=[[SubViewController alloc] initWithType:1];
	[self.view addSubview:subVC.view];

i am adding subview controller 3 different viewcontrollers (like mainviewcontroller).
how can i set xyzID then call RefreshPage method ?
i think i should use protocol or delegate.
thanks in advance.

[timle8n1]

You should read the View Controller Programming Guide

View Controller Programming Guide for iOS: About View Controllers

In particular

"Each custom view controller object you create is responsible for managing exactly one screen’s worth of content. The one-to-one correspondence between a view controller and a screen is a very important consideration in the design of your application. You should not use multiple custom view controllers to manage different portions of the same screen. Similarly, you should not use a single custom view controller object to manage multiple screens worth of content."

If for some reason you wanted to do that - you could create a protocol for a delegate to implement that the subview controller would invoke the delegate when things of interest happen.

[tester]

Originally Posted by timle8n1

You should read the View Controller Programming Guide

View Controller Programming Guide for iOS: About View Controllers

In particular

"Each custom view controller object you create is responsible for managing exactly one screen’s worth of content. The one-to-one correspondence between a view controller and a screen is a very important consideration in the design of your application. You should not use multiple custom view controllers to manage different portions of the same screen. Similarly, you should not use a single custom view controller object to manage multiple screens worth of content."

If for some reason you wanted to do that - you could create a protocol for a delegate to implement that the subview controller would invoke the delegate when things of interest happen.

yes i know it, thats why i said i should use protocol or delegate.
what do you advise if you use same button series (in a scrollview)on the top of your 3 viewcontrollers? buttons tag and title's are different for viewcontrollers. thats why i separated buttons into a subview and wrote sub viewcontroller.
i dont how to use protocols.

[timle8n1]

Originally Posted by tester

yes i know it, thats why i said i should use protocol or delegate.
what do you advise if you use same button series (in a scrollview)on the top of your 3 viewcontrollers? buttons tag and title's are different for viewcontrollers. thats why i separated buttons into a subview and wrote sub viewcontroller.
i dont how to use protocols.

IMHO, you are close but instead of a sub viewcontroller - you should just subclass UIView. Call it ScrollButtonView or something. Design a protocol for delegates to implement to be informed of button presses. Register your View Controller as the delegate. This is how UITableView works.

Here is an partial example
ScrollButtonView.h

#import <UIKit/UIKit.h>

@protocol ScrollButtonViewDelegate;

@interface ScrollButtonView : UIView {
	id delegate;
	UIButton *button1;
	UIButton *button2;
	UIButton *button3;
}

@property (assign) id<ScrollButtonViewDelegate> delegate;
@property (nonatomic, retain) IBOutlet UIButton *button1;
@property (nonatomic, retain) IBOutlet UIButton *button2;
@property (nonatomic, retain) IBOutlet UIButton *button3;

- (IBAction)internalButtonPressed:(id)sender;

@end 

@protocol ScrollButtonViewDelegate

- (void)buttonPressed:(id)sender;

@end

ScrollButtonView.m

#import "ScrollButtonView.h"

@implementation ScrollButtonView

@synthesize delegate;
@synthesize button1;
@synthesize button2;
@synthesize button3;

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        // Initialization code
    }
    return self;
}

- (void)internalButtonPressed:(id)sender {
	if (delegate && [delegate respondsToSelector:@selector(buttonPressed:)]) {
		[delegate buttonPressed:sender];
	}
}


- (void)dealloc {
    [super dealloc];
}

@end

[tester]

Originally Posted by timle8n1

IMHO, you are close but instead of a sub viewcontroller - you should just subclass UIView. Call it ScrollButtonView or something. Design a protocol for delegates to implement to be informed of button presses. Register your View Controller as the delegate. This is how UITableView works.

Here is an partial example
ScrollButtonView.h

#import <UIKit/UIKit.h>

@protocol ScrollButtonViewDelegate;

@interface ScrollButtonView : UIView {
	id delegate;
	UIButton *button1;
	UIButton *button2;
	UIButton *button3;
}

@property (assign) id<ScrollButtonViewDelegate> delegate;
@property (nonatomic, retain) IBOutlet UIButton *button1;
@property (nonatomic, retain) IBOutlet UIButton *button2;
@property (nonatomic, retain) IBOutlet UIButton *button3;

- (IBAction)internalButtonPressed:(id)sender;

@end 

@protocol ScrollButtonViewDelegate

- (void)buttonPressed:(id)sender;

@end

ScrollButtonView.m

#import "ScrollButtonView.h"

@implementation ScrollButtonView

@synthesize delegate;
@synthesize button1;
@synthesize button2;
@synthesize button3;

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        // Initialization code
    }
    return self;
}

- (void)internalButtonPressed:(id)sender {
	if (delegate && [delegate respondsToSelector:@selector(buttonPressed:)]) {
		[delegate buttonPressed:sender];
	}
}


- (void)dealloc {
    [super dealloc];
}

@end

everything is ok, but there is no code for "Register your View Controller as the delegate". how to register my ViewController for delegate?
i couldnt register it. i dont know where to.
thats why it doesnt respond the selector. i will use this ScrollButtonView in 3 viewcontrollers. how to register delegate for them?

thanks...

[tester]

i tried some codes, i hope its right.

in ViewControllers.h file:
#import "ScrollButtonView.h"
@interface MainViewController : UIViewController < ScrollButtonViewDelegate >
// setting property ...
in ViewControllers.m file
// setting @synthesize ..
// also dealloc

in viewdidload:

subView=[[ScrollButtonView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
[subView setDelegate:self];
[self.view addSubview:subView];

it works, thanks...