This is the example of a Picker with two components or wheels, and each wheel will be independent of the other wheel. The left wheel will have a list of sandwich fillings, and the right wheel will have a selection of bread types.
Step 1: Create a new project from Xcode and select view-base application template.
Step 2: Adding the following code to the controller Header file.
#define kFillingComponent 0
#define kBreadComponent 1
@interface DoubleComponentPickerViewController : UIViewController
<UIPickerViewDelegate, UIPickerViewDataSource>{
IBOutlet UIPickerView *doublePicker;
NSArray *fillingTypes;
NSArray *breadTypes;
}
@property (nonatomic,retain) UIPickerView *doublePicker;
@property (nonatomic,retain) NSArray *fillingTypes;
@property (nonatomic,retain) NSArray *breadTypes;
-(IBAction)buttonPressed;
Step 3: Double click .xib file to open the file in Interface Builder. Add a picker and abutton to te View, and then make the necessary connections. First, connect the doublePicker outlet on File’s Owner to the picker. Second, connect the DataSource and Delegate connections on the picker view to File’s Owner. Third, connect the Touch Up Inside event of the button to the buttonPressed action on File’s Owner. Now close your nib file and go back to Xcode.
Step 4: We need to add following code to our controller file. The buttonPressed method used when we request the selected row using those constants , kBreadComponent and kFillingComponent. There is a another method viewDidLoad: , we are just creating arrays from a hard loadinglist of strings.
{
NSInteger breadRow = [doublePicker selectedRowInComponent:
kBreadComponent];
NSInteger fillingRow = [doublePicker selectedRowInComponent:
kFillingComponent];
NSString *bread = [breadTypes objectAtIndex:breadRow];
NSString *filling = [fillingTypes objectAtIndex:fillingRow];
NSString *message = [[NSString alloc] initWithFormat:
@"Your %@ on %@ bread will be right up.",filling, bread];
UIAlertView *alert = [[ UIAlertView alloc] initWithTitle:
@"Thank you for your order"
message:message
delegate:nil
cancleButtonTitle:@"Great!"
otherButtonTitles:nil];
[alert show];
[alert release];
[message release];
}
- (void)viewDidLoad {
NSArray *breadArray = [[NSArray alloc] initWithObjects:
@"White",@"Whole Wheat",@"Rye",@"Sourdough",@"Seven Grain", nil];
self.breadTypes = breadArray;
[breadArray release];
NSArray *fillingArray = [[NSArray alloc] initWithObjects:
@"Turkey",@"Peanut Butter",@"Tuna Salad",@"Chicken Salad",@"Roast Beef",
@"Vegemite",nil];
self.fillingTypes = fillingArray;
[fillingArray release];
[super viewDidLoad];
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
if (component == kBreadComponent)
return[self.breadTypes count];
return[self.fillingTypes count];
}
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
if (component == kBreadComponent)
return [self. breadTypes objectAtIndex:row];
return [self.fillingTypes objectAtIndex:row];
}
Step 5: Now compile and run your application on simulator.(See figure 1)
Figure 1: Multicomponent Picker View.
You can downloaded SourceCode from here DoubleComponentPicker 2
Nice tutorial. Do you know how to make a Picker with two components or wheels, and one wheel will be dependent on the other wheel? Or do you know of an example?
Great tutorial. Do you know how to make a Picker with two components or wheels, and one wheel will be dependent on the other wheel?
This is the example of Picker with two components or wheels. I think this example will help you.
Great. Saved me a lot of time trying to figure out how to do this. My picker has 3 wheels!
How can I set a multi select picker with checkmarks. Like this :
http://www.imageurlhost.com/images/aqqoszg8839e707dwy6u.png
Please, help
Please go to below link:
Link: http://www.iphonedevsdk.com/forum/iphone-sdk-development/80641-multi-select-uipicker-xcode.html