Программный пример UIPickerView?

Ответ 1

Чтобы программно использовать UIPickerView:

- (void)pickerView:(UIPickerView *)pV didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if(component == 1)
        selectedRowPicker1 = row;
    else if(component == 2)
        selectedRowPicker2 = row;
    else
        selectedRowPicker3 = row;
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{ 
    if(component == 1)
        return [list1 count];
    else if(component == 2)
        return [list2 count];
    else
        return [list3 count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if(component == 1)
        val1 = [list1 objectAtIndex:row];
    else if(component == 2)
        val2 = [list2 objectAtIndex:row];
    else
        val3 = [list3 objectAtIndex:row];

    return strTemp;
}

Ответ 2

Это не будет работать в iOS 8

Создать UIPickerView программно с помощью DataSource

.h файл

@interface PickerViewTestAppViewController : UIViewController<UIPickerViewDelegate, UIPickerViewDataSource> {
     UIActionSheet *pickerViewPopup;
     UIPickerView *categoryPickerView;
     UIPickerView *pickerView;
     NSMutableArray *dataArray;
}

@property (nonatomic, retain) UIActionSheet *pickerViewPopup;
@property (nonatomic, retain) UIPickerView *categoryPickerView;
@property (nonatomic, retain) NSMutableArray *dataArray;

@end

.m file

@implementation PickerViewTestAppViewController

@synthesize pickerViewPopup,categoryPickerView;
@synthesize dataArray;

- (void)viewDidLoad {
    [super viewDidLoad];

 // Init the data array.
 dataArray = [[NSMutableArray alloc] init];

 // Add some data for demo purposes.
 [dataArray addObject:@"One"];
 [dataArray addObject:@"Two"];
 [dataArray addObject:@"Three"];
 [dataArray addObject:@"Four"];
 [dataArray addObject:@"Five"];

 pickerViewPopup = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];

 categoryPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 44, 0, 0)];

[categoryPickerView setDataSource: self];
[categoryPickerView setDelegate: self];
categoryPickerView.showsSelectionIndicator = YES;

    UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    pickerToolbar.barStyle = UIBarStyleBlackOpaque;
    [pickerToolbar sizeToFit];

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(categoryDoneButtonPressed)];

    UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(categoryCancelButtonPressed)];

    [pickerToolbar setItems:@[cancelBtn, flexSpace, doneBtn] animated:YES];

    [pickerViewPopup addSubview:pickerToolbar];
    [pickerViewPopup addSubview:categoryPickerView];
    [pickerViewPopup showInView:self.view];
    [pickerViewPopup setBounds:CGRectMake(0,0,320, 464)];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
// Handle the selection

NSLog(@"%@",[dataArray objectAtIndex:row]);       
selectedCategory = [NSString stringWithFormat:@"%@",[dataArray objectAtIndex:row]];
}
// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [dataArray count];
}

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

    return [dataArray objectAtIndex: row];

}

// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
    int sectionWidth = 300;

    return sectionWidth;
}

-(void)categoryDoneButtonPressed{
categoryLable.text = selectedCategory;
[pickerViewPopup dismissWithClickedButtonIndex:1 animated:YES];
}

-(void)categoryCancelButtonPressed{
    [pickerViewPopup dismissWithClickedButtonIndex:1 animated:YES];
}

Ссылка: http://gabriel-tips.blogspot.in/2011/04/uipickerview-add-it-programmatically_04.html

Ответ 3

 NSInteger selectCourse=[_coursePicker selectedRowInComponent:0];
    NSInteger selectSem=[_coursePicker selectedRowInComponent:1];
    NSString *whatCourse=[Course objectAtIndex:selectCourse];
    NSString *whatSem=[Sem objectAtIndex:selectSem];

    NSString *courses=[[NSString alloc]initWithFormat:@"Course : %@ - %@",whatCourse,whatSem];

    [self.selectedCours setTitle:courses forState:UIControlStateNormal];