iOS省市区三级联动PickerView

- (NSMutableArray<OVLocationBaseClass *> *)arrayList
{
    if (!_arrayList) {
        _arrayList = [[NSMutableArray alloc] init];
        NSString *path = [[NSBundle mainBundle] pathForResource:@"LocationJson" ofType:@"json"];
        NSData *data = [[NSData alloc] initWithContentsOfFile:path];
        NSArray *temArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        for (NSDictionary *dic in temArray) {
            OVLocationBaseClass *loc = [OVLocationBaseClass modelObjectWithDictionary:dic];
            [_arrayList addObject:loc];
        }
    }
    return _arrayList;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor whiteColor];
        self.delegate = self;
    }
    return self;
}

- (void)setLocationModel:(OVLocationModel *)locationModel
{
    _locationModel = locationModel;
    
    if (!locationModel) {
        
        [self selectRow:0 inComponent:0 animated:YES];
        _pro_index = 0;
        [self reloadComponent:1];
        
        [self selectRow:0 inComponent:1 animated:YES];
        _city_index = 0;
        [self reloadComponent:2];
        
        [self selectRow:0 inComponent:2 animated:YES];
        _area_index = 0;
        
        return;
    }
    
    _provinceStr = locationModel.provinceName;
    _cityStr = locationModel.cityName;
    _areaStr = locationModel.areaName;
    
    for (int i = 0; i < self.arrayList.count; i ++) {
        NSString *proStr = self.arrayList[i].name;
        if ([proStr isEqualToString:_provinceStr]) {
            [self selectRow:i inComponent:0 animated:YES];
            _pro_index = I;
            [self reloadComponent:1];
            for (int j = 0; j < self.arrayList[i].city.count; j ++) {
                OVLocationBaseClass *province = self.arrayList[I];
                OVLocationCity *city = province.city[j];
                NSString *cityStr = city.name;
                if ([cityStr isEqualToString:_cityStr]) {
                    [self selectRow:j inComponent:1 animated:YES];
                    _city_index = j;
                    [self reloadComponent:2];
                    for (int k = 0; k < city.area.count; k ++) {
                        NSString *areaStr = city.area[k];
                        if ([areaStr isEqualToString:_areaStr]) {
                            [self selectRow:k inComponent:2 animated:YES];
                            break;
                        }
                    }
                }
            }
        }
    }
}


#pragma mark - UIPickerViewDelegate && UIPickerViewDataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    return 40.0;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (component == 0) {
        return self.arrayList.count;
    } else if (component == 1) {
        return self.arrayList[_pro_index].city.count;
    }
    OVLocationCity *area = self.arrayList[_pro_index].city[_city_index];
    return area.area.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    //获取省份
    if (component == 0) {
        OVLocationBaseClass *province = self.arrayList[row];
        return province.name;
    } else if (component == 1) {
        //获取城市
        OVLocationBaseClass *province = self.arrayList[_pro_index];
        OVLocationCity *city = province.city[row];
        return city.name;
    }
    //获取区域
    OVLocationBaseClass *province = self.arrayList[_pro_index];
    OVLocationCity *city = province.city[_city_index];
    NSString *area = city.area[row];
    return area;
}

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    //获取省份
    if (component == 0) {
        OVLocationBaseClass *province = self.arrayList[row];
        return [[NSAttributedString alloc] initWithString:province.name attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15.0 * DEF_DEVICE]}];
    } else if (component == 1) {
        OVLocationBaseClass *province = self.arrayList[_pro_index];
        OVLocationCity *city = province.city[row];
        return [[NSAttributedString alloc] initWithString:city.name attributes:@{NSFontAttributeName:[UIFont fontWithName:@"PingFang-SC-Regular" size:15.0 * DEF_DEVICE]}];
    }
    //获取城市
    OVLocationBaseClass *province = self.arrayList[_pro_index];
    OVLocationCity *city = province.city[_city_index];
    NSString *area = city.area[row];
    return [[NSAttributedString alloc] initWithString:area attributes:@{NSFontAttributeName:[UIFont fontWithName:@"PingFang-SC-Regular" size:15.0 * DEF_DEVICE]}];
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    //设置分割线的颜色
    for (UIView *singleLine in pickerView.subviews) {
        if (singleLine.frame.size.height < 1.0) {
            singleLine.backgroundColor = [UIColor colorWithWhite:0.9 alpha:0.8];
        }
    }
    /*重新定义row 的UILabel*/
    UILabel *pickerLabel = pickerLabel = [[UILabel alloc] init];
    pickerLabel.font = [UIFont fontWithName:@"PingFang-SC-Regular" size:13.0 * DEF_DEVICE];
    pickerLabel.textAlignment = NSTextAlignmentCenter;
    pickerLabel.backgroundColor = [UIColor clearColor];
    pickerLabel.adjustsFontSizeToFitWidth = YES;
    
    pickerLabel.attributedText = [self pickerView:pickerView attributedTitleForRow:row forComponent:component];
    
    return pickerLabel;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (component == 0) {
        _pro_index = row;
        _city_index = 0;
        [pickerView reloadComponent:1];
        [pickerView reloadComponent:2];
        [pickerView selectRow:0 inComponent:1 animated:YES];
        [pickerView selectRow:0 inComponent:2 animated:YES];
    }
    if (component == 1) {
        _city_index = row;
        _area_index = row;
        [pickerView reloadComponent:2];
        [pickerView selectRow:0 inComponent:2 animated:YES];
    }
    if (component == 2) {
        _area_index = row;
    }
    
    OVLocationCity *city;
    NSString *stringProvince;
    NSString *stringCity;
    NSString *stringArea;
    
    if (component == 0) {
        OVLocationBaseClass *province = self.arrayList[row];
        stringProvince = province.name;
        city = province.city[0];
        stringCity = city.name;
        stringArea = city.area[0];
    } else if (component == 1) {
        OVLocationBaseClass *selectedProvince = self.arrayList[_pro_index];
        stringProvince = selectedProvince.name;
        OVLocationCity *selectedCity = selectedProvince.city[row];
        stringCity = selectedCity.name;
        stringArea = selectedCity.area[0];
    } else if (component == 2) {
        OVLocationBaseClass *selectedProvince = self.arrayList[_pro_index];
        stringProvince = selectedProvince.name;
        OVLocationCity *selectedCity = selectedProvince.city[_city_index];
        stringCity = selectedCity.name;
        stringArea = selectedCity.area[row];
    }
    _provinceStr = stringProvince;
    _cityStr = stringCity;
    _areaStr = stringArea;
    
    OVLocationModel *locationModel = [[OVLocationModel alloc] init];
    locationModel.provinceName = _provinceStr;
    locationModel.cityName = _cityStr;
    locationModel.areaName = _areaStr;
    [self.subject sendNext:locationModel];
}

gitee地址：https://gitee.com/ovix/areaPicker

本来是想详细整理下思路但是突然发现这完全不需要思路，就一层一层for循环，暴力破解就好
还是说两个吧
第一安利一个mac上字典转模型的工具(虽然会把NSString用strong声明非常蛋疼)

屏幕快照 2019-01-07 上午9.51.15.png

而且更蛋疼的是这个工具好像国内appstore被下架了各种论坛资源站也没有找到不过如果有大佬能找到还是期待分享
我是很久以前下载的所以appstore有记录
第二安利RAC啊真的不要太好用啊写项目RAC+MVVM+AOP真的是必备，简单、高效、方便、省时间
这个demo整体来说可以直接用不过如果不想用RAC的自行换成delegate或者block进行传值就可以了

以上

iOS省市区 三级联动PickerView

iOS省市区三级联动PickerView