how to add uipickerview as as subview to mainview in iphone? - iphone

Question

I have one application in which when user clicks a button i want to open uipickerview as as subview to main view and after user selects an item it should be removed from main view.(drop down kind of functionality).For that i have written code as below:
-(void)showPrefPicker:(id)sender
{
UIView *subView=[[UIView alloc] init];
subView.frame=CGRectMake(180, 120, 150, 150);
pickerView = [[UIPickerView alloc] init];
pickerView.showsSelectionIndicator = YES;
pickerView.dataSource = self;
pickerView.delegate = self;
pickerView.frame=CGRectMake(190, 130, 100, 100);
subView.backgroundColor=[UIColor blackColor];
[subView addSubview:pickerView];
[self.view addSubview:subView];
[pickerView release];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
return 1;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
NSLog(#"selected object is %#",[arraypref objectAtIndex:row]);
//[pickerView ]
//mlabel.text= [arrayNo objectAtIndex:row];
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
return [arraypref count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
return [arraypref objectAtIndex:row];
}
but is only showing subview in the main view not the pickerview.how can i do that any tutorial or source code for that?

Answer 1

Better you use
to hide
pickerview.hidden=YES;
to show
pickerview.hidden=NO;

Answer 2

Try changing the frame of the pickerView as
pickerView.frame = CGRectMake(10,10,100,100);

Answer 3

in your code subView.frame=CGRectMake(180, 120, 150, 150);
and pickerView.frame=CGRectMake(190, 130, 100, 100);
picker view is a subview of your 'subView'
here pickerview's frame starts out of bounds of subview ie origin x is 190. but the width of the subview is only 150.
so the correct code is
pickerView.frame=CGRectMake(0, 0, 100, 100);
since pickerview is a subview of a custom view. it should be in the frame of its parent view.