UIPicker訪問來自plist的項目

Question

我有一個正在加載到UIPickerView的plist。我可以訪問數組信息並將其加載到其中一個組件中的選取器中。我想要做的是訪問項目0或項目1，並根據條件將它們顯示在UILabel上。

我不知道如何訪問項目0或項目1（字符串值）。關於如何去做這件事的任何提示？謝謝您的幫助。

這裏是一個圖像，以澄清什麼我談論：

Answer 1

pickerViewcontroller.h

#import <UIKit/UIKit.h> 
#define kStateComponent 0 
#define kZipComponent 1 

    @interface PickerViewController : UIViewController 
    <UIPickerViewDataSource,UIPickerViewDelegate>{ 
     IBOutlet UIPickerView *dpicker; 
     NSDictionary *stateZip; 
     NSArray *states; 
     NSArray *zips; 

    } 
    @property (nonatomic,retain) UIPickerView *dpicker; 
    @property (nonatomic,retain) NSDictionary *stateZip; 
    @property (nonatomic, retain) NSArray *states; 
    @property (nonatomic, retain) NSArray *zips; 
    @end 

pickerViewcontroller.m

#import "PickerViewController.h" 


@implementation PickerViewController 
@synthesize dpicker;     
@synthesize stateZip; 
@synthesize states; 
@synthesize zips; 


-(void) viewDidLoad{ 

    NSBundle *bundle = [NSBundle mainBundle]; 

    NSString *plistPath =[bundle pathForResource:@"plistfilename" ofType:@"plist"]; 

    NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; 
    self.stateZip=dictionary; 
    [dictionary release]; 


    NSArray *component = [self.stateZip allKeys]; 
    NSArray *sorted =[component sortedArrayUsingSelector:@selector(compare:)]; 
    self.states=sorted; 


      NSString *selectedState = [self.states objectAtIndex:0]; 
     NSArray *array = [stateZip objectForKey:selectedState]; 
    self.zips = array; 


} 




#pragma mark - 
#pragma mark Memory management 

- (void)didReceiveMemoryWarning { 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Relinquish ownership any cached data, images, etc that aren't in use. 
} 

- (void)viewDidUnload { 
    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand. 
    // For example: self.myOutlet = nil; 
} 

- (void)dealloc { 
    [dpicker release]; 
    [stateZip release]; 
    [states release]; 
    [zips release]; 
    [super dealloc]; 
} 
#pragma mark- 
#pragma mark picker Data Source Methods 
-(NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerview 
{ 
    return 2; 
} 
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    if (component == kStateComponent) 

     return [self.states count]; 

    return [self.zips count]; 
} 
#pragma mark picker delegate Methods 
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row 
      forComponent:(NSInteger)component 
{ 


    if(component == kStateComponent) 

     return[self.states objectAtIndex:row]; 



    return [self.zips objectAtIndex:row]; 

} 
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
     if(component == kStateComponent) 
    { 

     NSString *selectedState = [self.states objectAtIndex:row]; 
     NSArray *array=[stateZip objectForKey:selectedState]; 
     self.zips=array; 
     [dpicker selectRow:0 inComponent:kZipComponent animated:YES]; 
     [dpicker reloadComponent:kZipComponent]; 
    } 
} 


@endhere