How to pass Arrays to a UIPickerView from one class to another? - objective-c

Question

Bah. I've pulled my hair out over this problem for the past couple days now, but I know I must be overlooking the obvious. I've made my PickerViewController(.h./m) and PickerViewAppDelegate(.h/.m) files and they run fine as a standalone program, but I would like to have the picker pop up after a procedureal event occurs in my "helloworld.m" file. I can get the picker to show up, but I cannot for the life of me figure out how to populate it so that it isn't blank. I THINK I've done everything right up until I try to pass my array to my pickerview object. What am I doing wrong?
PickerViewController.h
#import <UIKit/UIKit.h>
#interface PickerViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate> {
IBOutlet UIPickerView *pickerView;
NSMutableArray *scrollerData;
}
#property (nonatomic, retain) IBOutlet UIPickerView *pickerView;
#property (nonatomic, retain) NSMutableArray *scrollerData;
-(void)setScrollerData:(NSMutableArray *)array;
#end
PickerViewController.m
#import "PickerViewController.h"
#implementation PickerViewController
#synthesize pickerView, scrollerData;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
self.pickerView.delegate = self;
self.pickerView.dataSource = self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (void)dealloc {
// [arrayColors release];
[super dealloc];
}
-(void)setScrollerData:(NSMutableArray *)array
{
//[self.scrollerData arrayByAddingObjectsFromArray:array];
scrollerData = array;
}
#pragma mark -
#pragma mark Picker View Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [scrollerData count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [scrollerData objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSLog(#"Selected Number: %#. Index of selected numbers: %i", [scrollerData objectAtIndex:row], row);
}
PickerViewAppDelegate.h
#import <UIKit/UIKit.h>
#class PickerViewController;
#interface PickerViewAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
PickerViewController *pvController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#end
PickerViewAppDelegate.m
#import "PickerViewAppDelegate.h"
#import "PickerViewController.h"
#implementation PickerViewAppDelegate
#synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
pvController = [[PickerViewController alloc] initWithNibName:#"PickerView" bundle:[NSBundle mainBundle]];
[window addSubview:pvController.view];
// Override point for customization after application launch
[window makeKeyAndVisible];
}
- (void)dealloc {
[pvController release];
[window release];
[super dealloc];
}
#end
Helloworld.m
...
UIView* view = [[CCDirector sharedDirector] openGLView];
UIPickerView *pickerView=[[UIPickerView alloc] init];
pickerView.frame=CGRectMake(100,100, 200, 200);
NSMutableArray *arrayNumbers = [[NSMutableArray alloc] init];
[arrayNumbers addObject:#"30"];
[arrayNumbers addObject:#"31"];
[arrayNumbers addObject:#"32"];
[arrayNumbers addObject:#"33"];
[arrayNumbers addObject:#"34"];
[arrayNumbers addObject:#"35"];
[arrayNumbers addObject:#"36"];
[pickerView setscrollerData: arrayNumbers];//Should I be calling pickerView here or something else?
[view addSubview: pickerView];
pickerView.hidden=NO;
...

Answer 1

You have overridden the setter method generated by #synthesize in PickerViewController, so you are no longer retaining it.
Then, you are calling setScrollerData on your pickerView (this should be giving you a warning or crashing since pickerView doesn't respond to that method).
You are not setting PickerViewController as the delegate or datasource of your picker view in helloworld.m.
I can't see where your hello world code fits in. It seems to be adding a new picker view rather than using the one from the xib of PickerViewController. You should be instantiating pickerviewcontroller from your hello world and adding its .view as a subview or presenting it as a modal view controller rather than setting up a new picker view. You can then pass your array to the instance of pickerviewcontroller. Note though that it is not standard to have a separate view controller for what is essentially a subview, though I don't have much knowledge of cocos2d so I don't know if this is normal when using that framework.

Answer 2

Well, i think you should just pass the array from HelloWorld class to PickerViewController class using property/synthesize.