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:



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: