picker VIew初始化和加载plist数据

 1 //确定pickerVIew轮子的个数
 2 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
 3 {
 4     return 2;
 5 }
 6 //确定pickerView的每个轮子的item数
 7 -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
 8 {
 9     if (component == 0) {//省份个数
10         return [provinceArray count];
11     }
12     else  //市的个数
13     {
14         return [cityArray count];
15     }
16 }
17 //确定每个轮子的每一项显示什么内容
18 #pragma mark 实现协议UIPickerViewDelegate方法
19 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
20 {
21     if (component == 0) {//选择省份名
22         return [provinceArray objectAtIndex:row];
23     }
24     else//选择市名
25     {
26         return [cityArray objectAtIndex:row];
27     }
28 }

 1 //加载数据plist里面的数据
 2 NSString *plistPath = [[NSBundle mainBundle]pathForResource:@"province" ofType:@"plist"];
 3 //获取属性列表文件中的全部数据
 4 NSDictionary *dict = [[NSDictionary alloc]initWithContentsOfFile:plistPath];
 5 self.pickerData = dict;
 6 
 7 //省份名数据
 8 self.pickerProvincesData = [self.pickerData allKeys];
 9 
10 //默认取出第一个省的所有市的数据
11 NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:0];
12 self.pickerCitiesData = [self.pickerData objectForKey:seletedProvince];
13 
14 self.pickerView.dataSource = self;
15 self.pickerView.delegate = self;