IOS開發之自制城市選擇器（省份+城市+區/縣城）（storyboard版）

2019-11-14 18:52:52

字體：大中小

來源：轉載

供稿：網友

第一步：新建single工程CitySelectedDemo

第二步：導入資源area.plist(千萬勾選copy選項，后面附area.plist文件資源)

第三步：設計mian.storyboard

——》拖拽UITextField控件（運行后點擊此輸入框會彈出選擇器，選擇我們想要的城市地址后結果顯示在輸入框中）；

——》拖拽Toolbar控件和UipickerView控件組成城市選擇器；（將Toolbar控件的Item更名為“完成”，將來點擊“完成”按鈕結束地址的選擇，如果“完成”按鈕在Toolbar的左側覺得別扭可再拖拽一個Flexibel控件于“完成”的左側）結果如圖：

第四步：連線

——》點擊上圖最上面的第一個黃色圓形圖案，出現如下圖界面：

——》點擊上圖右上角顯示藍色的圖案；再從下方Referencing Outlets下得New Referencing Outlets右側的圓圈中拖拽連線到UIPickerView控件上分別選擇delegate和dataSource；結果如下圖：

——》再連線視圖與ViewController.m

（1）UITextFiled連接一個UIOutlet命名為cityField和一個Action命名為CityAction（Action連接上Event選擇Edit Did Begin，表示開始編輯輸入框時就要執行的動作）

（2）Toolbar連接一個UIOutlet命名為cityToolbar，Toolbar上的“完成”按鈕連接一個Action命名為selectedAction

（3）UIPickerView連接一個UIOutlet命名為cityPicker

——》將Toolbar與UIPickerView兩個控件的Hidden屬性勾選，使其不可見；

第五步：編碼

——》編寫數據模型HZLocation（需新建File，繼承NSObject大類）

#import <Foundation/Foundation.h>@interface HZLocation : NSObject@PRoperty (copy, nonatomic) NSString *country;@property (copy, nonatomic) NSString *state;@property (copy, nonatomic) NSString *city;@property (copy, nonatomic) NSString *district;@property (copy, nonatomic) NSString *street;@property (nonatomic) double latitude;@property (nonatomic) double longitude;@end

#import "HZLocation.h"@implementation HZLocation@synthesize country = _country;@synthesize state = _state;@synthesize city = _city;@synthesize district = _district;@synthesize street = _street;@synthesize latitude = _latitude;@synthesize longitude = _longitude;@end

——》在ViewController.h中，引入HZLocation.h，并引入UIPickerViewDelegate，UIPickerViewDatasource

#import <UIKit/UIKit.h>#import "HZLocation.h"@interface ViewController : UIViewController<UIPickerViewDelegate, UIPickerViewDataSource>@property (strong, nonatomic) HZLocation *locate;@end

——》在ViewController.m中

#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UITextField *cityField;- (IBAction)CityAction:(id)sender;@property (weak, nonatomic) IBOutlet UIToolbar *cityToolbar;- (IBAction)selectedAction:(id)sender;@property (weak, nonatomic) IBOutlet UIPickerView *cityPicker;@property (nonatomic, strong) NSArray *provinces;@property (nonatomic, strong) NSArray *cities;@property (nonatomic, strong) NSArray *areas;@property (nonatomic, strong) NSString *selected;@end@implementation ViewController@synthesize provinces, cities, areas;@synthesize locate=_locate;@synthesize cityPicker = _cityPicker;- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        self.cityField.inputView = [[UIView alloc] initWithFrame:CGRectZero];        provinces = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"area.plist" ofType:nil]];    cities = [[provinces objectAtIndex:0] objectForKey:@"cities"];        self.locate.state = [[provinces objectAtIndex:0] objectForKey:@"state"];    self.locate.city = [[cities objectAtIndex:0] objectForKey:@"city"];        areas = [[cities objectAtIndex:0] objectForKey:@"areas"];    if (areas.count > 0) {        self.locate.district = [areas objectAtIndex:0];    } else{        self.locate.district = @"";    }}-(HZLocation *)locate{    if (_locate == nil) {        _locate = [[HZLocation alloc] init];    }        return _locate;}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 3;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    switch (component) {        case 0:            return [provinces count];            break;        case 1:            return [cities count];            break;        case 2:            return [areas count];            break;                    default:            return 0;            break;    }    }- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{        switch (component) {        case 0:            return [[provinces objectAtIndex:row] objectForKey:@"state"];            break;        case 1:            return [[cities objectAtIndex:row] objectForKey:@"city"];            break;        case 2:            if ([areas count] > 0) {                return [areas objectAtIndex:row];                break;            }        default:            return  @"";            break;    }}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    switch (component) {        case 0:            cities = [[provinces objectAtIndex:row] objectForKey:@"cities"];            [self.cityPicker selectRow:0 inComponent:1 animated:YES];            [self.cityPicker reloadComponent:1];                        areas = [[cities objectAtIndex:0] objectForKey:@"areas"];            [self.cityPicker selectRow:0 inComponent:2 animated:YES];            [self.cityPicker reloadComponent:2];                        self.locate.state = [[provinces objectAtIndex:row] objectForKey:@"state"];            self.locate.city = [[cities objectAtIndex:0] objectForKey:@"city"];            if ([areas count] > 0) {                self.locate.district = [areas objectAtIndex:0];            } else{                self.locate.district = @"";            }            break;        case 1:            areas = [[cities objectAtIndex:row] objectForKey:@"areas"];            [self.cityPicker selectRow:0 inComponent:2 animated:YES];            [self.cityPicker reloadComponent:2];                        self.locate.city = [[cities objectAtIndex:row] objectForKey:@"city"];            if ([areas count] > 0) {                self.locate.district = [areas objectAtIndex:0];            } else{                self.locate.district = @"";            }            break;        case 2:            if ([areas count] > 0) {                self.locate.district = [areas objectAtIndex:row];            } else{                self.locate.district = @"";            }            break;        default:            break;    }    NSString *str = [self.locate.state stringByAppendingString:self.locate.city];    _selected = [str stringByAppendingString:self.locate.district];}- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{    UILabel* pickerLabel = (UILabel*)view;    if (!pickerLabel){        pickerLabel = [[UILabel alloc] init];        pickerLabel.adjustsFontSizeToFitWidth = YES;        [pickerLabel setFont:[UIFont boldSystemFontOfSize:15]];    }    pickerLabel.text=[self pickerView:pickerView titleForRow:row forComponent:component];    return pickerLabel;}- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{    if (component == 0) {        return 80;    }    if (component == 1) {        return 100;    }    return 120;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (IBAction)CityAction:(id)sender {    self.cityToolbar.hidden = NO;    self.cityPicker.hidden = NO;}- (IBAction)selectedAction:(id)sender {    self.cityToolbar.hidden = YES;    self.cityPicker.hidden = YES;    self.cityField.text = _selected;}@end