3 UIPicker view in single view controller - iphone

Question

i have 3 picker view in my view controller
the picker1 contain contain 2 row Audio and Video.picker2 contain product type,if audio is selected in picker1 then picker2 should populate with (transistor,walkman,ipod) and if video is selected in picker1 then picker2 should populate with (tv,screen,monitor) and if walkman is selected in picker2 then picker3 should populate with (sony,philips,jbl).
i am confused with the if condition....
if ([[categoryArray objectAtIndex:row] isEqual:#"Audio"] && [[audioProduct objectAtIndex:row] isEqual:#"walkman"])
{
NSLog(#"Audio and walkman");
modelArray=[[NSMutableArray alloc]initWithObjects:#"walkman1",#"walkman2",#"walman3", nil];
[modelPickerView reloadAllComponents];
}
else if ([[categoryArray objectAtIndex:row] isEqual:#"Audio"] && [[audioProduct objectAtIndex:row] isEqual:#"mp3"]) {
modelArray=[[NSMutableArray alloc]initWithObjects:#"mp3",#"mp3", #"mp3",#"mp3",nil];
[modelPickerView reloadAllComponents];
}

Answer 1

you have to load picker2 and picker 3 conditionally, as follows:
picker1Array=[[NSMutableArray alloc] initWithObjects:#"Audio",#"Video", nil]
if ([[picker1array objectAtIndex:[picker1 selectedRowInComponent:0]] isEqual:#"Audio"])
{
picker2Array=[[NSMutableArray alloc] initWithObjects:#"transistor",#"walkman",#"ipod", nil];
}
else {
picker2Array=[[NSMutableArray alloc] initWithObjects:#"tv",#"screen",#"monitor", nil];
}
[picker2 reloadAllComponents];
if ([[picker2array objectAtIndex:[picker2 selectedRowInComponent:0]] isEqual:#"walkman"]){
picker3Array=[[NSMutableArray alloc] initWithObjects:#"sony",#"philips",#"jbl", nil];
}
[picker3 reloadAllComponents];

Answer 2

please try the following code.
in .h file please declare
NSMutableArray *randCatSel;
NSMutableArray *randSubCatSel;
NSMutableArray *randItemSel;
UIPickerView *packerView;
and in .m file write this code.
- (void)fetchedData{
randCatSel =[[NSMutableArray alloc] initWithObjects:#"Audio",#"Video", nil];
packerView=[[UIPickerView alloc] initWithFrame:CGRectMake(0, 280, 320, 200)];
packerView.delegate=self;
packerView.dataSource=self;
packerView.tag=1;
[self.view addSubview:packerView];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component
{
if(pickerView.tag==1)
{
return [randCatSel count];
}
else if(pickerView.tag==2)
{
return [randSubCatSel count];
}
else if(pickerView.tag==3)
{
return [randItemSel count];
}
else
{
return 0;
}
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if(pickerView.tag==1)
{
return [randCatSel objectAtIndex:row];
}
else if(pickerView.tag==2)
{
return [randSubCatSel objectAtIndex:row];
}
else if(pickerView.tag==3)
{
return [randItemSel objectAtIndex:row];
}
else
{
return 0;
}
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if(pickerView.tag==1)
{
if(randSubCatSel.count>0)
{
randSubCatSel=nil;
}
if([[randCatSel objectAtIndex:row] isEqualToString:#"Audio"])
{
randSubCatSel=[[NSMutableArray alloc] initWithObjects:#"Transistor",#"walkman",#"ipod", nil];
}
else
{
randSubCatSel=[[NSMutableArray alloc] initWithObjects:#"TV",#"Screen",#"Monitor", nil];
}
[packerView removeFromSuperview];
packerView=[[UIPickerView alloc] initWithFrame:CGRectMake(0, 280, 320, 200)];
packerView.delegate=self;
packerView.dataSource=self;
packerView.tag=2;
[self.view addSubview:packerView];
}
else if(pickerView.tag==2)
{
//do coding according to randSubCatSel for randItemSel
}
}
please note that this is sample code for your requirement. you need to make changes accordingly.
i hope this code will help you.