iOS 城市3级联动

UIPickerView 实现城市选择三级联动。

需要用到一些宏定义

---

#define InitObject(vc) [[vc alloc]init]

#define RECT(x,y,width,height) CGRectMake(x,y,width,height)

上代码

初始化话一个UIPickerView

InitObject(UIPickerView); 是一个宏定义
- (void)createPicker
{
self.picker = InitObject(UIPickerView);
self.picker.frame = RECT(0,30*HeightProportion, Main_Screen_Width, 150*HeightProportion);
self.picker.dataSource = self;
self.picker.delegate = self;
self.picker.showsSelectionIndicator = YES;
self.picker.backgroundColor = [UIColor whiteColor];
[self.pickerBackView addSubview:self.picker];
[self.backView addSubview:self.pickerBackView];

//加载城市plist
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"city" ofType:@"plist"];

cityArray = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];

//刷新第一列数据

[self.picker reloadComponent:0];

//刷新第二列

[self.picker reloadComponent:1];

//刷新第3列 当第一列是省级城市的时候需要刷新

//[self.picker reloadComponent:3];

}

---

实现代理方法

#pragma mark-----------pickerView delegate-------------------------

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView

{

//一共有几列 这里是3级联动

return 3;

}

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

//第1列有多少item

if (0 == component)

{

return cityArray.count;

}

//第2列有多少item

if (1 == component) {

//获取第2列选中项 获取对应字典拿到下级数组

NSInteger rowProvince = [pickerView selectedRowInComponent:0];

NSDictionary * province = [cityArray objectAtIndex:rowProvince];

NSArray * city = [province objectForKey:@"cities"];

return city.count;

}else{

//获取第3列选中项 获取对应字典拿到下级数组

NSInteger rowProvince = [pickerView selectedRowInComponent:0];

NSDictionary * province = [cityArray objectAtIndex:rowProvince];

NSArray * city = [province objectForKey:@"cities"];

NSInteger rowCity = [pickerView selectedRowInComponent:1];

NSDictionary * district = [city objectAtIndex:rowCity];

NSArray *country = [district objectForKey:@"areas"];

return country.count;

}

}

//title 显现 类似cell的 （

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

） 方法

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

{

if (0 == component) {

return [[cityArray objectAtIndex:row] objectForKey:@"state"];

}

if(1 == component){

NSInteger rowProvince = [pickerView selectedRowInComponent:0];

NSDictionary * province = [cityArray objectAtIndex:rowProvince];

NSArray * city = [province objectForKey:@"cities"];

return [[city objectAtIndex:row] objectForKey:@"city"];

}else{

NSInteger rowProvince = [pickerView selectedRowInComponent:0];

NSDictionary * province = [cityArray objectAtIndex:rowProvince];

NSArray * city = [province objectForKey:@"cities"];

NSInteger rowCity = [pickerView selectedRowInComponent:1];

NSDictionary * district = [city objectAtIndex:rowCity];

NSArray *country = [district objectForKey:@"areas"];

return [country objectAtIndex:row];

}

}

---

滚动处理

#pragma mark - 当用户选中UIPickerViewDataSource中指定列和列表项时激发该方法

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

{

if(0 == component){

[pickerView reloadComponent:1];

[pickerView selectRow:0 inComponent:1 animated:YES];

[pickerView reloadComponent:2];

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

}

if(1 == component)

{

[pickerView reloadComponent:2];

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

}

//在其他界面需要拿到数据 可以无视

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

//NSMutableArray * cityArray = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];

//获取选中的内容

NSString * one,*two,*three;

NSInteger rowProvince = [self.picker selectedRowInComponent:0];

NSDictionary * province = [cityArray objectAtIndex:rowProvince];

NSArray * city = [province objectForKey:@"cities"];

NSInteger rowCity = [self.picker selectedRowInComponent:1];

NSDictionary * district = [city objectAtIndex:rowCity];

NSArray *country = [district objectForKey:@"areas"];

NSInteger rowMin = [self.picker selectedRowInComponent:2];

one = [province objectForKey:@"state"];

if (city.count>0) {

two = [district objectForKey:@"city"];

}

if (country.count>0) {

three = [country objectAtIndex:rowMin];

}

address = [NSString stringWithFormat:@"%@%@%@",one,two,three];

}

以上就是基本实现方法了，可以考虑把这个封装在一个BaseViewController 将UIPickerView做成属性 在子控制器直接调用。

-----city.plist下载地址

http://pan.baidu.com/s/1pKUgkDd