接着上篇的代码 http://download.csdn.net/detail/totogo2010/4391870 ,我们要实现的效果如下:
当选择左边的一级选项时,左边展示一级选项里含有的二级选项,选择后显示在TextField里。
如何实现呢?建立一个和左边的列表key对应的数组,当选择这个key时,刷新左边UIPickerView部分的内容显示对应数组的数据,选择时,找到
两个UIPickerView部件rowIndex,找出数据,放到TextField里。
1、打开上篇PickerViewDemo项目,在ViewController.h添加两个成员变量:NSArray *subPickerArray; NSDictionary *dicPicker;
[cpp] view
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- #import <UIKit/UIKit.h>
- @interface ViewController : UIViewController<UIPickerViewDelegate, UITextFieldDelegate,UIPickerViewDataSource>
- {
- NSArray *pickerArray;
- NSArray *subPickerArray;
- NSDictionary *dicPicker;
- }
- - (IBAction)selectButton:(id)sender;
- @property (strong, nonatomic) IBOutlet UIToolbar *doneToolbar;
- @property (strong, nonatomic) IBOutlet UIPickerView *selectPicker;
- @property (strong, nonatomic) IBOutlet UITextField *textField;
- @end
2、初始化
[cpp] view
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- - (void)viewDidLoad
- {
- [super viewDidLoad];
- pickerArray = [NSArray arrayWithObjects:@"动物",@"植物",@"石头", nil];
- dicPicker = [NSDictionary dictionaryWithObjectsAndKeys:
- [NSArray arrayWithObjects:@"鱼",@"鸟",@"虫子", nil], @"动物",
- [NSArray arrayWithObjects:@"花",@"草",@"葵花", nil], @"植物",
- [NSArray arrayWithObjects:@"疯狂的石头",@"花岗岩",@"鹅卵石", nil], @"石头",nil];
- subPickerArray = [dicPicker objectForKey:@"动物"];
- textField.inputView = selectPicker;
- textField.inputAccessoryView = doneToolbar;
- textField.delegate = self;
- selectPicker.delegate = self;
- selectPicker.dataSource = self;
- selectPicker.frame = CGRectMake(0, 480, 320, 216);
- }
给 NSDictionary *dicPicker;赋值,对应的三个关键字添加了对应的数组。
3、Component返回两个,这样就有两个齿轮了。
[cpp] view
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- -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
- return 2;
- }
4、使用宏
在#import "ViewController.h"下面定义两个宏,代表UIPickerView齿轮的左边的部分和右边的部分。左边的部分是0,右边的是1.
#import "ViewController.h"
#define kFirstComponent 0
#define kSubComponent 1
5、判断是那个齿轮,返回相应的数据的Count。
[cpp] view
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- -(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
- if(component == kFirstComponent){
- return [pickerArray count];
- }else {
- return [subPickerArray count];
- }
- }
6、根据component返回相应的String数据
[cpp] view
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- -(NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
- if(component == kFirstComponent){
- return [pickerArray objectAtIndex:row];
- }else {
- return [subPickerArray objectAtIndex:row];
- }
- }
7、拖动左边的齿轮时,右边的数据相应的Reload更新。
[cpp] view
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- -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
- if (component == kFirstComponent) {
- subPickerArray = [dicPicker objectForKey:[pickerArray objectAtIndex:row]];
- [pickerView selectRow:0 inComponent:kSubComponent animated:YES];
- [pickerView reloadComponent:kSubComponent];
- }
- }
8、相应选择的数据,并显示在TextField上。
[cpp] view
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- -(void)textFieldDidEndEditing:(UITextField *)textField{
- NSInteger firstViewRow = [selectPicker selectedRowInComponent:kFirstComponent];
- NSInteger subViewRow = [selectPicker selectedRowInComponent:kSubComponent];
- NSString * firstString = [pickerArray objectAtIndex:firstViewRow];
- NSString * subString = [[dicPicker objectForKey:[pickerArray objectAtIndex:firstViewRow]] objectAtIndex:subViewRow] ;
- NSString *textString = [[NSString alloc ] initWithFormat:@"您选择了:%@%@%@", firstString, @" 里的 ", subString];
- self.textField.text = textString;
- }
- - (IBAction)selectButton:(id)sender {
- [textField endEditing:YES];
- }
大功告成,运行,点击TextField,弹出:
最终代码:http://download.csdn.net/detail/totogo2010/4393004
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