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iOS开发-数据选择UIPickerView

UIPickerView开发一般选择区域或者分级数据的时候会使用到,类似于前端中用到树状结构,不过PC上一般都是从上到下的分级,使用UIPickView是从左到右实现,可以动态的设置UIPickView中中行列数据,将结果显示在文本输入框里,简单的定义一下数据源。通过声明协议捕获事件,展示结果,比较简单,进入正题.

页面布局

页面布局比较简单,一个UIPickerView,一个文本框:

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头文件中的声明,实现了UIPickerViewDelegate,UIPickerViewDataSource协议:

@interface ViewController : UIViewController <UIPickerViewDelegate,UIPickerViewDataSource>@property (weak, nonatomic) IBOutlet UIPickerView *pickView;@property (weak, nonatomic) IBOutlet UITextField *areaTextField;@end

 Demo实现

定义存储数据的数组:

@interface ViewController (){   NSArray *areaArr;   NSMutableArray *teamArr;}

初始化数据:

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    areaArr=@[@"西南区",@"中央区",@"东南区",@"大西洋区",@"西北区",@"太平洋区"];    teamArr=[[NSMutableArray alloc] init];    [teamArr addObject:@[@"马刺",@"灰熊",@"小牛",@"火箭",@"鹈鹕"]];    [teamArr addObject:@[@"活塞",@"步行者",@"骑士",@"公牛",@"雄鹿"]];    [teamArr addObject:@[@"热火",@"魔术",@"老鹰",@"奇才",@"黄蜂"]];    [teamArr addObject:@[@"凯尔特人",@"76人",@"尼克斯",@"篮网",@"猛龙"]];    [teamArr addObject:@[@"森林狼",@"掘金",@"爵士",@"开拓者",@"雷霆"]];    [teamArr addObject:@[@"国王",@"太阳",@"湖人",@"快船",@"勇士"]];}

设置PickerView的列数:

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}

返回行数:

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    //判断列    if (component==0) {        return [areaArr count];    }else{        //判断0列中当前的行号        NSInteger  currentRow=[pickerView selectedRowInComponent:0];        return [teamArr[currentRow] count];    }}

 设置每行每列中的数据:

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    if (component==0) {        //o列从区域数组中选择        return areaArr[row];    }else{        //根据0列中选择的行号        NSInteger  currentRow=[pickerView selectedRowInComponent:0];        return teamArr[currentRow][row];    }}

 选择完成之后的事件:

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    [pickerView reloadComponent:1];    NSInteger areaRow=[pickerView selectedRowInComponent:0];    NSInteger teamRow=[pickerView selectedRowInComponent:1];    [_areaTextField setText:[NSString stringWithFormat:@"%@-%@",areaArr[areaRow],teamArr[areaRow][teamRow]]];    }

 具体效果如下:

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iOS开发-数据选择UIPickerView