UIPickerView प्रोग्रामेटिक उदाहरण?

Question

इंटरफ़ेस बिल्डर का उपयोग किये बिना मैं प्रोग्राम में यूआईपीकर व्यू को कैसे देख सकता हूं? यूआईपीकर व्यू के प्रतिनिधि भागों के साथ काम करने के तरीके को समझने में भी परेशानी हो रही है।

Answer 1

UIPickerView प्रोग्राम के रूप में जोड़ने के लिए:

- (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; 
} 

Answer 2

यह आईओएस में काम नहीं करेगा 8

UIPickerView प्रोग्राम के रूप में साथ डेटास्रोत

ज फ़ाइल बनाएँ

@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 

मीटर फ़ाइल

@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]; 
} 

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

Answer 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];