城市选择器

效果

源码

https://github.com/YouXianMing/Animations

//// CustomCityPickerViewController.m// Animations//// Created by YouXianMing on 2017/9/12.// Copyright © 2017年 YouXianMing. All rights reserved.//#import "CustomCityPickerViewController.h"#import "PickerCityDataManager.h"#import "FileManager.h"#import "NSData+JSONData.h"#import "CustomPickerView.h"#import "PickerViewDataAdapter.h"#import "UIView+SetRect.h"#import "PickerProvinceView.h"#import "PickerCityView.h"#import "PickerAreaView.h"@interface CustomCityPickerViewController () <CustomPickerViewDelegate>@property (nonatomic, strong) NSArray <PickerProvinceModel *> *provinces;@property (nonatomic, strong) CustomPickerView  *pickerView;@property (nonatomic, strong) PickerViewDataAdapter *pickerViewDataAdapter;@end@implementation CustomCityPickerViewController- (void)viewDidLoad {  [super viewDidLoad]; // Get data. NSData *data  = [NSData dataWithContentsOfFile:[FileManager bundleFileWithName:@"city.json"]]; NSArray *provinces = [data toListProperty]; self.provinces  = [PickerCityDataManager provinceModelsWithArray:provinces];  // Create CustomPickerView's dataAdapter. self.pickerViewDataAdapter = [PickerViewDataAdapter pickerViewDataAdapterWithComponentsBlock:^(NSMutableArray<PickerViewComponent *> *components) {    // Province component.  PickerViewComponent *provinceComponent = [PickerViewComponent pickerViewComponentWithRowsBlock:^(NSMutableArray<PickerViewRow *> *rows) {      [self.provinces enumerateObjectsUsingBlock:^(PickerProvinceModel *provinceModel, NSUInteger idx, BOOL * _Nonnull stop) {        [rows addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerProvinceView class] data:provinceModel]];   }];     } componentWidth:Width / 3.f - 5.f];    // City component.  PickerViewComponent *cityComponent = [PickerViewComponent pickerViewComponentWithRowsBlock:^(NSMutableArray<PickerViewRow *> *rows) {      [self.provinces.firstObject.cities enumerateObjectsUsingBlock:^(PickerCityModel *cityModel, NSUInteger idx, BOOL * _Nonnull stop) {        [rows addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerCityView class] data:cityModel]];   }];     } componentWidth:Width / 3.f - 5.f];    // Area component.  PickerViewComponent *areaComponent = [PickerViewComponent pickerViewComponentWithRowsBlock:^(NSMutableArray<PickerViewRow *> *rows) {      [self.provinces.firstObject.cities.firstObject.areas enumerateObjectsUsingBlock:^(PickerAreaModel *areaModel, NSUInteger idx, BOOL * _Nonnull stop) {        [rows addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerAreaView class] data:areaModel]];   }];     } componentWidth:Width / 3.f - 5.f];    [components addObject:provinceComponent];  [components addObject:cityComponent];  [components addObject:areaComponent];   } rowHeight:60.f];  // Create CustomPickerView. self.pickerView = [[CustomPickerView alloc] initWithFrame:CGRectMake(0, 0, Width, 0)              delegate:self           pickerViewHeightType:kCustomPickerViewHeightTypeMax             dataAdapter:self.pickerViewDataAdapter]; self.pickerView.center = self.contentView.middlePoint; [self.contentView addSubview:self.pickerView];}#pragma mark - CustomPickerViewDelegate- (void)customPickerView:(CustomPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {  if (component == 0) {    NSMutableArray *citys = [NSMutableArray array];  [self.provinces[row].cities enumerateObjectsUsingBlock:^(PickerCityModel *cityModel, NSUInteger idx, BOOL * _Nonnull stop) {      [citys addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerCityView class] data:cityModel]];  }];    NSMutableArray *areas = [NSMutableArray array];  [self.provinces[row].cities.firstObject.areas enumerateObjectsUsingBlock:^(PickerAreaModel *areaModel, NSUInteger idx, BOOL * _Nonnull stop) {      [areas addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerAreaView class] data:areaModel]];  }];    pickerView.pickerViewDataAdapter.components[1].rows = citys;  pickerView.pickerViewDataAdapter.components[2].rows = areas;  [pickerView reloadComponent:1];  [pickerView reloadComponent:2];  [pickerView selectRow:0 inComponent:1 animated:YES];  [pickerView selectRow:0 inComponent:2 animated:YES];   } else if (component == 1) {    NSInteger  provinceIndex = [self.pickerView selectedRowInComponent:0];  NSMutableArray *areas   = [NSMutableArray array];    // Protect crash.  if (self.provinces[provinceIndex].cities.count <= row) {      row = self.provinces[provinceIndex].cities.count - 1;  }    [self.provinces[provinceIndex].cities[row].areas enumerateObjectsUsingBlock:^(PickerAreaModel *areaModel, NSUInteger idx, BOOL * _Nonnull stop) {      [areas addObject:[PickerViewRow pickerViewRowWithViewClass:[PickerAreaView class] data:areaModel]];  }];    pickerView.pickerViewDataAdapter.components[2].rows = areas;  [pickerView reloadComponent:2];  [pickerView selectRow:0 inComponent:2 animated:YES]; }}- (void)customPickerView:(CustomPickerView *)pickerView didSelectedRows:(NSArray <NSNumber *> *)rows selectedDatas:(NSArray <id> *)datas {  NSLog(@"%@", datas);}@end

特点

1. 每一个row都可以像使用UITableView的cell一样可以定制，继承CustomPickerView即可

2. 数据源通过PickerViewDataAdapter来指定，每一个PickerViewComponent都有一个PickViewRow的数组，每一个PickViewRow元素都对应一个自定义的CustomPickerView。

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原标题：城市选择器

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