iOS开发--UIPickerView(选择器控件) 省份和城市的做法

//UIPickerView 是一个选择器控件,它可以生成单列的选择器，也可生成多列的选择器

@interface ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>

@property(strong,nonatomic) UIPickerView *MyPickerView;

@property(strong,nonatomic) NSMutableArray *ProvinceArr;

@property(strong,nonatomic) NSMutableArray *CityArr;

@property(strong,nonatomic) NSArray *arr;

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

self.ProvinceArr=[NSMutableArray array];

self.CityArr=[NSMutableArray array];

//文件的路径

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

self.arr=[NSArray arrayWithContentsOfFile:path];

//省份的遍历循环

for (int i=0;i<self.arr.count; i++)

{

[self.ProvinceArr addObject:self.arr[i][@"State"]];

}

//选择器控件

self.MyPickerView=[[UIPickerView alloc] initWithFrame:CGRectMake(70, 100, 300, 300)];

self.MyPickerView.delegate=self;

self.MyPickerView.dataSource=self;

self.MyPickerView.backgroundColor=[UIColor clearColor];

[self.view addSubview:self.MyPickerView];

}

#pragma mark 数据源 numberOfComponentsInPickerView

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 2;

}

#pragma mark 数据源 numberOfRowsInComponent

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

{

if (component==0)

{

return self.ProvinceArr.count;

}

else

{

return self.CityArr.count;

}

}

#pragma delegate 显示信息方法

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

{

if (component==0)

{

return self.ProvinceArr[row];

}

return self.CityArr[row];

}

#pragma mark 选中行信息

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

{

if (component==0)

{

[self.CityArr removeAllObjects];

NSInteger RowProvinceArr=[pickerView selectedRowInComponent:0];

NSArray *arr11=self.arr[RowProvinceArr][@"Cities"];

//市区的遍历循环

for (int i=0; i<arr11.count; i++)

{

[self.CityArr addObject:arr11[i][@"city"]];

}

//刷新 reload

[self.MyPickerView reloadComponent:1];

}

else

{

// UIAlertView *MyAlertView=[[UIAlertView alloc] initWithTitle:@"系统提示" message:[NSString stringWithFormat:@"%@--%@",[_ProvinceArr objectAtIndex:row],[_CityArr objectAtIndex:row]]delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

// [MyAlertView show];

NSString *str=[NSString stringWithFormat:@"%@--%@",_ProvinceArr[[pickerView selectedRowInComponent:0]],_CityArr[row]];

//提示框

UIAlertController *MyAlertController=[UIAlertController alertControllerWithTitle:@"系统提示" message:str preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *MyAlertAction=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)

{

NSLog(@"确定");

}];

UIAlertAction *MyAlertAction1=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)

{

NSLog(@"取消");

}];

[MyAlertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField)

{

textField.backgroundColor=[UIColor whiteColor];

}];

[MyAlertController addAction:MyAlertAction1];

[MyAlertController addAction:MyAlertAction];

[self presentViewController:MyAlertController animated:YES completion:nil];

}

}

#pragma mark 显示行高

-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

return 50.00;

}