创建关联的UIPickerView 显示省市

创建关联的UIPickerView 显示省市

iPhone 2010-03-28 12:42:57 阅读225 评论2   字号：大 中 小   订阅

//

//  DependentComponentPickerViewController.m

//  Pickers

//

//  Created by Jeff LaMarche on 7/7/08.

//  Copyright 2008 __MyCompanyName__. All rights reserved.

//

 

#import "DependentComponentPickerViewController.h"

 

 

@implementation DependentComponentPickerViewController

@synthesize picker;

@synthesize stateZips;

@synthesize states;

@synthesize zips;

 

- (IBAction )butonPressed:(id )sender

{

NSInteger stateRow = [ picker selectedRowInComponent: kStateComponent ];

NSInteger zipRow = [ picker selectedRowInComponent: kZipComponent ];

NSString *state = [self .states objectAtIndex :stateRow];

NSString *zip = [self .zips objectAtIndex :zipRow];

NSString *title = [[ NSString alloc ] initWithFormat : @"You selected zip code %@.", zip];

NSString *message = [[NSString alloc ] initWithFormat :@"%@ is in %@" , zip, state ];

UIAlertView *alert = [[ UIAlertView alloc] initWithTitle:title message:message delegate: nil cancelButtonTitle: @"OK" otherButtonTitles: nil ];

[alert show ];

[alert release ];

[title release ];

[message release ];

}

- (id )initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

if (self = [super initWithNibName :nibNameOrNil bundle :nibBundleOrNil]) {

// Initialization code

}

return self;

}

 

- (void )viewDidLoad {

NSBundle *bundle = [NSBundle mainBundle ];

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

NSDictionary *dictionary = [[NSDictionary alloc ] initWithContentsOfFile :plistPath];

self .stateZips = dictionary;

[dictionary release ];

NSArray *components = [self .stateZips allKeys ];

NSArray *sorted = [components sortedArrayUsingSelector: @selector ( compare:)];

self .states = sorted;

NSString *selectedState = [self .states objectAtIndex :0 ];

NSArray *array = [stateZips objectForKey :selectedState];

self .zips = array;

}

 

 

 

- (BOOL )shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation )interfaceOrientation {

// Return YES for supported orientations

return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

 

 

- (void )didReceiveMemoryWarning {

[ super didReceiveMemoryWarning ]; // Releases the view if it doesn't have a superview

// Release anything that's not essential, such as cached data

}

 

 

- (void )dealloc {

[ picker release];

[ stateZips 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 = [stateZips objectForKey :selectedState];

self .zips = array;

[picker selectRow:0 inComponent:kZipComponent animated:YES ];

[ picker reloadComponent: kZipComponent ];

}

}

- (CGFloat )pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger )component

{

if (component == kZipComponent )

return 90 ;

return 205 ;

}

@end