call a function from UIView in UIViewController?

[mikolo]

Hi,

i have defined two UIViews and one action in my UIViewController like this:

PHP Code:

#import <UIKit/UIKit.h>
#import "LoginView.h"
#import "ContactListView.h"

@interface NowHereViewController : UIViewController {
    IBOutlet LoginView *loginView;
    IBOutlet ContactListView *contactListView;
        
}

-(void)swichView:(id)sender;

@end 


first i load the loginView in my view in NowHereViewController.m like this:

PHP Code:

- (void)viewDidLoad {
    NSLog(@" ---- viewDidLoad ---- ");
    
    [self.view addSubview:loginView];
    [loginView initLoginView];
        [super viewDidLoad];
    
} 


now i want to call the function swichView in the NowHereViewController from the loginView again?

How can i do this?
Thanxxx for help.

[kierster]

Originally Posted by mikolo

Hi,

i have defined two UIViews and one action in my UIViewController like this:

PHP Code:

#import <UIKit/UIKit.h>
#import "LoginView.h"
#import "ContactListView.h"

@interface NowHereViewController : UIViewController {
    IBOutlet LoginView *loginView;
    IBOutlet ContactListView *contactListView;
        
}

-(void)swichView:(id)sender;

@end 


first i load the loginView in my view in NowHereViewController.m like this:

PHP Code:

- (void)viewDidLoad {
    NSLog(@" ---- viewDidLoad ---- ");
    
    [self.view addSubview:loginView];
    [loginView initLoginView];
        [super viewDidLoad];
    
} 


now i want to call the function swichView in the NowHereViewController from the loginView again?

How can i do this?
Thanxxx for help.

I had this same problem myself.
There's probably an easier way but here's how I solved it.

Add this to your view.h file

NowHereViewController *controller;

Make it a property in the .h and synthesize it in the .m file.
You will use controller to access the controller.

In the viewDidLoad of your viewcontroller add this line:

self.view.controller = self;

This sends a pointer of your view controller to the view, so it can access it.

Just be careful with this though! If the viewcontroller is non-existent the view will crash when its calls for it. You need to ensure that if a new view is made it will also know of this change. I add a if(self.controller != nil) whenever I call the controller, just so that if I forget to set the controller, it won't ruin everything!

Hope it works for you!

[mikolo]

Originally Posted by kierster

I had this same problem myself.
There's probably an easier way but here's how I solved it.

Add this to your view.h file

NowHereViewController *controller;

Make it a property in the .h and synthesize it in the .m file.
You will use controller to access the controller.

In the viewDidLoad of your viewcontroller add this line:

self.view.controller = self;

This sends a pointer of your view controller to the view, so it can access it.

Just be careful with this though! If the viewcontroller is non-existent the view will crash when its calls for it. You need to ensure that if a new view is made it will also know of this change. I add a if(self.controller != nil) whenever I call the controller, just so that if I forget to set the controller, it won't ruin everything!

Hope it works for you!

Hi, thank you but i become the error: expected specifier-qalifier-list before 'NowHereViewController'!

I don`t konw what does this means? Can you help me again? I read also about protocol... but i don`t understand ... the apple help ist realy difficult!

[mikolo]

Originally Posted by mikolo

Hi, thank you but i become the error: expected specifier-qalifier-list before 'NowHereViewController'!

I don`t konw what does this means? Can you help me again? I read also about protocol... but i don`t understand ... the apple help ist realy difficult!

OK i got it now.. but a little bit different and with one warning! Here ist my result:

In NowHereViewController.m i wrote:

PHP Code:

- (void)viewDidLoad {
    NSLog(@" ---- viewDidLoad ---- ");
    
    [self.view addSubview:loginView];
    
    loginView.controller = self;
    [loginView initLoginView];
    
    [super viewDidLoad];
    
    
} 


In LoginView.h i have:

PHP Code:

@interface LoginView : UIView {

    UIViewController *controller;
}

@property (nonatomic, retain) UIViewController *controller; 


in Login.m i can call the method like this:

PHP Code:

[controller swichView:(@"ContactListView")]; 


but here comes a warning like this: 'UIViewController' may not respond to '-switchView:'

Maybe someone knows.. how i fix also this warning.. but when i try to do all with NowHereViewController it doesn`t work!

[kierster]

Originally Posted by mikolo

OK i got it now.. but a little bit different and with one warning! Here ist my result:

In NowHereViewController.m i wrote:

PHP Code:

- (void)viewDidLoad {
    NSLog(@" ---- viewDidLoad ---- ");
    
    [self.view addSubview:loginView];
    
    loginView.controller = self;
    [loginView initLoginView];
    
    [super viewDidLoad];
    
    
} 


In LoginView.h i have:

PHP Code:

@interface LoginView : UIView {

    UIViewController *controller;
}

@property (nonatomic, retain) UIViewController *controller; 


in Login.m i can call the method like this:

PHP Code:

[controller swichView:(@"ContactListView")]; 


but here comes a warning like this: 'UIViewController' may not respond to '-switchView:'

Maybe someone knows.. how i fix also this warning.. but when i try to do all with NowHereViewController it doesn`t work!

Don't worry about the warning too much:
Switch UIViewController with NowHereViewController. And add this line above it.

@class NowHereViewController;
@interface LoginView : UIView {

	NowHereViewController *controller;
}

Be sure you add "NowHereViewController.h" to your .m file.

#import "NowHereViewController.h"

Now you should be set!

[mikolo]

Originally Posted by kierster

Don't worry about the warning too much:
Switch UIViewController with NowHereViewController. And add this line above it.

@class NowHereViewController;
@interface LoginView : UIView {

	NowHereViewController *controller;
}

Be sure you add "NowHereViewController.h" to your .m file.

#import "NowHereViewController.h"

Now you should be set!

Yeppa thanx a lot it works! I love you

[pandacat]

Originally Posted by mikolo

Yeppa thanx a lot it works! I love you

Reading this post solved the same question I was having, so now I don't have to bug somebody else. 16 and so smart - way to go!! Thanks a bunch

[xoshi101]

Originally Posted by kierster

In the viewDidLoad of your viewcontroller add this line:

self.view.controller = self;

This sends a pointer of your view controller to the view, so it can access it.

When I put this in my MainViewController.m file, it causes a build error.

Here's what I want to do. There's a void in my MainViewController.m file that I want to be able to call from MainView.m. This void needs to display the in-app email form.

MainViewController.h

- (void)showEmailModalView:(NSString*) storyText;

This is the function I want to call. storyText is the string that I want to display in the body of the email.

MainView.h

#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
@class MainViewController;
@interface MainView : UIView {
	IBOutlet UITextField *userName;
	IBOutlet UISegmentedControl *userGender;
	IBOutlet UITextView *storyBox;
	
	MainViewController *controller;
}

@property (nonatomic, retain) MainViewController *controller;

MainView.m

#import "MainView.h"
#import "MainViewController.h"
//import email sheet stuff
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>

@implementation MainView

@synthesize controller;

//bunch of other program code

//email function
-(IBAction)emailStory {
	//check if user entered a name
	NSLog(@"MainView.m -(IBAction)emailStory called");
	if(storyName==nil) {
		//display warning
	} else {
		NSString *storyTextToEmail = [storyBox text];
		[controller showEmailModalView:storyTextToEmail];
	}
}

XCode isn't giving me warnings or errors, but when I put self.view.controller = self; or MainView.controller = self; in the viewDidLoad as stated above, it gives me errors.

If I use self.view.controller = self;, XCode says
error: request for member 'controller' in something not a structure or union

If I use MainView.controller = self;, XCode says
error: accessing unknown 'setController:' class method
error: object cannot be set - either readonly property or no setter found

Any suggestions? I'm completely stumped by this.

[kgupta]

I am getting same errors, please guide.

Thanks.

Originally Posted by xoshi101

When I put this in my MainViewController.m file, it causes a build error.

Here's what I want to do. There's a void in my MainViewController.m file that I want to be able to call from MainView.m. This void needs to display the in-app email form.

MainViewController.h

- (void)showEmailModalView:(NSString*) storyText;

This is the function I want to call. storyText is the string that I want to display in the body of the email.

MainView.h

#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
@class MainViewController;
@interface MainView : UIView {
	IBOutlet UITextField *userName;
	IBOutlet UISegmentedControl *userGender;
	IBOutlet UITextView *storyBox;
	
	MainViewController *controller;
}

@property (nonatomic, retain) MainViewController *controller;

MainView.m

#import "MainView.h"
#import "MainViewController.h"
//import email sheet stuff
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>

@implementation MainView

@synthesize controller;

//bunch of other program code

//email function
-(IBAction)emailStory {
	//check if user entered a name
	NSLog(@"MainView.m -(IBAction)emailStory called");
	if(storyName==nil) {
		//display warning
	} else {
		NSString *storyTextToEmail = [storyBox text];
		[controller showEmailModalView:storyTextToEmail];
	}
}

XCode isn't giving me warnings or errors, but when I put self.view.controller = self; or MainView.controller = self; in the viewDidLoad as stated above, it gives me errors.

If I use self.view.controller = self;, XCode says
error: request for member 'controller' in something not a structure or union

If I use MainView.controller = self;, XCode says
error: accessing unknown 'setController:' class method
error: object cannot be set - either readonly property or no setter found

Any suggestions? I'm completely stumped by this.