UIPickerView实现省 市 区三级联动

前几天用UIPickerView实现了一下三级联动具体的如下图

下面是实现方式

#import "ViewController.h"

#define FirstComponent

#define SubComponent

#define ThirdComponent

@interface ViewController ()

@property(nonatomic,retain)NSDictionary* dict;

@property(nonatomic,retain)NSArray* pickerArray;

@property(nonatomic,retain)NSArray* subPickerArray;

@property(nonatomic,retain)NSArray* thirdPickerArray;

@property(nonatomic,retain)NSArray* selectArray;

@end

@implementation ViewController

@synthesize dict=_dict;

@synthesize pickerArray=_pickerArray;

@synthesize subPickerArray=_subPickerArray;

@synthesize thirdPickerArray=_thirdPickerArray;

@synthesize selectArray=_selectArray;

- (void)viewDidLoad

{

[superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

NSString* plistPath=[[NSBundle mainBundle] pathForResource:@"Address" ofType:@"plist"];

_dict=[[NSDictionary alloc] initWithContentsOfFile:plistPath];

self.pickerArray=[_dict allKeys];

self.selectArray=[_dict objectForKey:[[_dict allKeys] objectAtIndex:0]];

if ([_selectArray count]>0) {

self.subPickerArray= [[self.selectArray objectAtIndex:0] allKeys];

}

if ([_subPickerArraycount]>0)
{

self.thirdPickerArray=[[self.selectArray objectAtIndex:0] objectForKey:[self.subPickerArray objectAtIndex:0]];

}

}

- (void)didReceiveMemoryWarning

{

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

#pragma mark --

#pragma mark--UIPickerViewDataSource

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return3;

}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

if (component==FirstComponent) {

return [self.pickerArray count];

}

if (component==SubComponent) {

return [self.subPickerArray count];

}

if (component==ThirdComponent) {

return [self.thirdPickerArray count];

}

return0;

}

#pragma mark--

#pragma mark--UIPickerViewDelegate

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row
forComponent:(NSInteger)component

{

if (component==FirstComponent) {

return [self.pickerArray objectAtIndex:row];

}

if (component==SubComponent) {

return [self.subPickerArray objectAtIndex:row];

}

if (component==ThirdComponent) {

return [self.thirdPickerArray objectAtIndex:row];

}

return
nil;

}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
inComponent:(NSInteger)component

{

NSLog(@"row is %d,Component is %d",row,component);

if (component==0) {

self.selectArray=[_dict objectForKey:[self.pickerArray objectAtIndex:row]];

if ([self.selectArray count]>0)
{

self.subPickerArray= [[self.selectArray objectAtIndex:0] allKeys];

}else{

self.subPickerArray=nil;

}

if ([self.subPickerArraycount]>0)
{

self.thirdPickerArray=[[self.selectArray objectAtIndex:0] objectForKey:[self.subPickerArray objectAtIndex:0]];

}else{

self.thirdPickerArray=nil;

}

[pickerView selectedRowInComponent:1];

[pickerView reloadComponent:1];

[pickerView selectedRowInComponent:2];

}

if (component==1) {

if ([_selectArraycount]>0&&[_subPickerArraycount]>0)
{

self.thirdPickerArray=[[self.selectArray objectAtIndex:0] objectForKey:[self.subPickerArray objectAtIndex:row]];

}else{

self.thirdPickerArray=nil;

}

[pickerView selectRow:0 inComponent:2 animated:YES];

}

[pickerView reloadComponent:2];

}

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

{

if (component==FirstComponent) {

return90.0;

}

if (component==SubComponent) {

return120.0;

}

if (component==ThirdComponent) {

return100.0;

}

return0;

}

-(void)dealloc

{

self.dict=nil;

self.pickerArray=nil;

self.subPickerArray=nil;

self.thirdPickerArray=nil;

self.selectArray=nil;

[superdealloc];

}

@end