1 #import "ViewController.h"
2
3 @interface ViewController ()
4
5 @property(strong, nonatomic) UIPickerView * pickerView;
6 @property(strong, nonatomic) UILabel * label;
7 @property(strong, nonatomic) UIButton * button;
8 @property (nonatomic, strong) NSDictionary *pickerData; //保存全部数据
9 @property (nonatomic, strong) NSArray *pickerProvincesData;//当前的省数据
10 @property (nonatomic, strong) NSArray *pickerCitiesData;//当前的省下面的市数据
11
12 @end
13
14 @implementation ViewController
15
16 - (void)viewDidLoad {
17 [super viewDidLoad];
18 // Do any additional setup after loading the view, typically from a nib.
19
20 self.pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 48, 320, 162)];
21 self.pickerView.backgroundColor = [UIColor groupTableViewBackgroundColor];
22 [self.view addSubview:self.pickerView];
23 self.label = [[UILabel alloc]initWithFrame:CGRectMake(63, 285, 195, 33)];
24 self.label.textAlignment = NSTextAlignmentCenter;
25 self.label.text = @"显示信息";
26 self.label.backgroundColor = [UIColor groupTableViewBackgroundColor];
27 [self.view addSubview:self.label];
28 self.button = [[UIButton alloc]initWithFrame:CGRectMake(88, 413, 144, 44)];
29 [self.button setTitle:@"显示在Label上" forState:UIControlStateNormal];
30 self.button.backgroundColor = [UIColor brownColor];
31 [self.button addTarget:self action:@selector(tapShow) forControlEvents:UIControlEventTouchUpInside];
32 [self.view addSubview:self.button];
33
34 NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"PC" ofType:@"plist"];
35 //获取属性列表文件中的全部数据
36 NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
37 self.pickerData = dict;
38
39 //省份名数据
40 self.pickerProvincesData = [self.pickerData allKeys];
41
42 //默认取出第一个省的所有市的数据
43 NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:0];
44 self.pickerCitiesData = [self.pickerData objectForKey:seletedProvince];
45
46 self.pickerView.dataSource = self;
47 self.pickerView.delegate = self;
48
49
50 }
51
52 - (void)tapShow
53 {
54 NSInteger row1 = [self.pickerView selectedRowInComponent:0];
55 NSInteger row2 = [self.pickerView selectedRowInComponent:1];
56 //NSLog(@"row1 = %lu",row1);
57 //NSLog(@"row2 = %lu",row2);
58 NSString *selected1 = [self.pickerProvincesData objectAtIndex:row1];
59 NSString *selected2 = [self.pickerCitiesData objectAtIndex:row2];
60
61 NSString *title = [[NSString alloc] initWithFormat:@"%@，%@",
62 selected1,selected2];
63
64 self.label.text = title;
65
66 }
67
68 #pragma mark 实现协议UIPickerViewDataSource方法
69 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
70 return 2;
71 }
72 //初始化时component先为0，后为1，返回省份个数和和市的个数，以确定省份的行数和市的临时初始化行数。此后选择省的时候component为1，返回市的个数
73 - (NSInteger)pickerView:(UIPickerView *)pickerView
74 numberOfRowsInComponent:(NSInteger)component {
75 if (component == 0)
76 {//省份个数
77 return [self.pickerProvincesData count];
78 } else
79 {//市的个数
80 return [self.pickerCitiesData count];
81 }
82
83 }
84
85 #pragma mark 实现协议UIPickerViewDelegate方法
86 //选择省份的时候component先为0，后为1。然后选择市的时候返回市所在的row号。将其省和市显示在pickerview的显示条上
87 -(NSString *)pickerView:(UIPickerView *)pickerView
88 titleForRow:(NSInteger)row forComponent:(NSInteger)component {
89 //NSLog(@"row2 = %lu",row);
90 //NSLog(@"component2 = %lu",component);
91 if (component == 0)
92 {//选择省份名
93 return [self.pickerProvincesData objectAtIndex:row];
94 } else
95 {//选择市名
96 return [self.pickerCitiesData objectAtIndex:row];
97 }
98 }
99 //只有选择省份的时候component为0，返回省所在的row号，然后根据省份取出省所有的市。选择市的时候component为1。（作用为重新加载数据到pickerview上）
100 - (void)pickerView:(UIPickerView *)pickerView
101 didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
102 //NSLog(@"row3 = %lu",row);
103 //NSLog(@"component3 = %lu",component);
104 if (component == 0)
105 {
106 NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:row];
107 NSArray *array = [self.pickerData objectForKey:seletedProvince];
108 //NSLog(@"array = %@",array);
109 self.pickerCitiesData = array;//将所选省的所有市存入pickerCitiesData
110 [self.pickerView reloadComponent:1];
111 }
112 }
113 - (void)didReceiveMemoryWarning {
114 [super didReceiveMemoryWarning];
115 // Dispose of any resources that can be recreated.
116 }
117
118 @end
1、常用属性
//显示选中框
showsSelectionIndicator
2、常用方法
//返回rows的所有行号行号
- (NSInteger)numberOfRowsInComponent:(NSInteger)component;
//重新加载所有的元素
- (void)reloadAllComponents;
//通过赋值加载所选择的数据
- (void)reloadComponent:(NSInteger)component;
//协议UIPickerViewDataSource方法
//确定轮子的列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 2;
}
//初始化时component先为0，后为1，返回省份个数和和市的个数，以确定省份的行数和市的临时初始化行数。此后选择省的时候component为1，返回市的个数
- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component {
if (component == 0)
{//省份个数
return [self.pickerProvincesData count];
} else
{//市的个数
return [self.pickerCitiesData count];
}
}
//协议UIPickerViewDelegate方法
//选择省份的时候component先为0，后为1。然后选择市的时候返回市所在的row号。将其省和市显示在pickerview的显示条上
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component {
//NSLog(@"row2 = %lu",row);
//NSLog(@"component2 = %lu",component);
if (component == 0)
{//选择省份名
return [self.pickerProvincesData objectAtIndex:row];
} else
{//选择市名
return [self.pickerCitiesData objectAtIndex:row];
}
}
//只有选择省份的时候component为0，返回省所在的row号，然后根据省份取出省所有的市。选择市的时候component为1。（作用为重新加载数据到pickerview上）
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
//NSLog(@"row3 = %lu",row);
//NSLog(@"component3 = %lu",component);
if (component == 0)
{
NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:row];
NSArray *array = [self.pickerData objectForKey:seletedProvince];
//NSLog(@"array = %@",array);
self.pickerCitiesData = array;//将所选省的所有市存入pickerCitiesData
[self.pickerView reloadComponent:1];
}
}