UIPickerview AppDelegate problem with subviews - iphone

Question

Issue with subviews but it may be related to the AppDelegate with respect to placing a UIPickerView in myView as apposed to self.view?
Thanks
[self.view addSubview:pickerView]; <-- works ok
//[myView addSubview:pickerView];<-- fails, can't get dial movement or response
AppDelegate.h
#import <UIKit/UIKit.h>
#class PickerViewController;
#interface PickerViewAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
PickerViewController *pvController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#end
AppDelegate.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
Controller.h
#import <UIKit/UIKit.h>
#interface PickerViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate> {
IBOutlet UIPickerView *pickerView;
NSMutableArray *arrayColors;
}
#end
Controller.m
#import "PickerViewController.h"
#implementation PickerViewController
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
[myView setBackgroundColor:[UIColor blueColor]];
[self.view addSubview:myView];
UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, 100.0)];
pickerView.delegate = self;
pickerView.showsSelectionIndicator = YES;
arrayColors = [[NSMutableArray alloc] init];
for (int i=0; i<60; i++) {
[arrayColors addObject:[NSString stringWithFormat:#"%d", i]];
}
//[self.view addSubview:pickerView]; // <-- works
[myView addSubview:pickerView]; // <-- this fails.. this is what I need for multiple views
}
- (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];
}
#pragma mark -
#pragma mark Picker View Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [arrayColors count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [arrayColors objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSLog(#"Selected Color: %#. Index of selected color: %i", [arrayColors objectAtIndex:row], row);
}
#end

Answer 1

If you comment
[myView addSubview:pickerView];
you will understand, that myView frame is too small. You will be able to interact with the picker only touching that parent view frame. If you want to make the pickers behave normally, you must set the parent view frame to contain the picker frame - make it equal or larger.
Please remember iOs Human Interface Guidelines,
The overall size of a picker, including its background, is fixed at the same size as the keyboard on iPhone.

Answer 2

Make sure that myView has userInteractionEnabled set to YES?