UIPickerView选择省市

来源：互联网发布：ios wkwebview 传值js 编辑：程序博客网时间：2024/04/30 11:53
1.遵守协议<UIPickerViewDataSource, UIPickerViewDelegate>//存放省份@property (nonatomic, strong) NSMutableArray *shengFen;//存放城市@property (nonatomic, strong) NSArray *city;//存放 省份->城市 字典@property (nonatomic, strong) NSMutableDictionary *dict;//全局pickerView@property (nonatomic, weak) UIPickerView *pickerView;@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    [self loadData];      [self _initPickerView];      /**初始数据*/   //显示第一个省份    NSString *shengFen = [_shengFen objectAtIndex:index];   //用省份做Key取出城区数组，这样刚初始化完后就会显示省份对应的城区了    _city = [_dict objectForKey:shengFen];}//创建pickerView- (void)_initPickerView{    /**创建pickerView*/    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(20, 40, 300, 300)];    [self.view addSubview:pickerView];    self.pickerView = pickerView;    /**设置代理*/    pickerView.dataSource = self;    pickerView.delegate = self;   }//返回多少列- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}//每列多少行- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    if (component == 0) {               return _shengFen.count;           }else{               return _city.count;     }}//设置标题- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{       if (component == 0) {        return _shengFen[row];           }else{               return _city[row];    }          return 0;}//点击单元格调用- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    if (component == 0) {               /**取出当前选择的省份*/        NSString *seleteShengFen = [_shengFen objectAtIndex:row];               /**用省份做key取出数组赋值给city*/        _city = [_dict objectForKey:seleteShengFen];        /**刷新数据*/        [pickerView reloadComponent:1];    }    /**取得第0列和第1列当前显示的行数 从数组取得对应数据*/    NSInteger index = [pickerView selectedRowInComponent:0];    NSInteger index1 = [pickerView selectedRowInComponent:1];    self.lable.text = [NSString stringWithFormat:@"%@:%@",_shengFen[index] , _city[index1]];    }//加载数据- (void)loadData{    NSString *path = [[NSBundle mainBundle] pathForResource:@"city.plist" ofType:nil];       NSArray *arr = [NSArray arrayWithContentsOfFile:path];        _shengFen = [[NSMutableArray alloc] init];    _dict = [NSMutableDictionary dictionary];       for (NSDictionary *dict in arr) {               //城市列表        NSArray *city = dict[@"cities"];               //取出省份 存入数组        NSString *str = [dict objectForKey:@"state"];        [_shengFen addObject:str];               //取出城市存入数组        _city = [NSArray arrayWithArray:city];        [_dict setObject:city forKey:str];           } }
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