标签上显示的 UIPickerView 选项

Posted 2023-02-27

【中文标题】标签上显示的 UIPickerView 选项

【英文标题】：UIPickerView choices shown on label

【发布时间】：2014-10-13 03:11:35

【问题描述】：

我的 UIPickerView 有 3 个组件，下面有 3 个标签。当为选择器的一个组件选择答案时，我希望第一个标签显示该组件的答案。然后第二个和第三个组件显示在第二个和第三个标签上。但是它目前没有像我想的那样工作，有什么建议吗？

我认为我的问题在于“-(void)pickerView:(UIPickerView *)pickerView didSelectRow:”部分

#import "ViewController.h"

@interface ViewController2 : UIViewController<UIPickerViewDataSource,  UIPickerViewDelegate>

@property (weak, nonatomic) IBOutlet UIPickerView *picker1;


@property (weak, nonatomic) IBOutlet UILabel *label1;

@property (weak, nonatomic) IBOutlet UILabel *label2;

@property (weak, nonatomic) IBOutlet UILabel *label3;

@end

和：

import "ViewController2.h"

@interface ViewController2 ()

NSArray*othercolourArray;
NSArray*otherseasonArray;
NSArray*otherotherArray;



@end


@implementation ViewController2



- (void)viewDidLoad 
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

othercolourArray =[[NSArray alloc]initWithObjects:@"Health Prof", @"Housekeep",     @"Visitors", @"Other",nil];
otherseasonArray =[[NSArray alloc]initWithObjects:@"Midwife", @"Nurse", @"Doctor",@"Other", nil];
otherotherArray =[[NSArray alloc]initWithObjects:@"Known Midwife", @"New Midwife", @"Doctor",@"Other", nil];



-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

return 3;




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

switch (component) 
    case 0:
        return othercolourArray.count;
        break;


    case 1:
        return otherseasonArray.count;
        break;

    case 2:
        return otherotherArray.count;
        break;



    default:
        break;



return 0;




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

// This method provides the data for a specific row in a specific component.

switch (component) 
    case 0:
        return [othercolourArray objectAtIndex:row];
        break;


    case 1:
        return [otherseasonArray objectAtIndex:row];
        break;


    case 2:
        return [otherotherArray objectAtIndex:row];
        break;





    default:
        break;



return 0;






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

_label1.text = [othercolourArray objectAtIndex: row];
_label2.text = [otherseasonArray objectAtIndex: row ];
_label3.text = [otherotherArray objectAtIndex: row ];





- (void)didReceiveMemoryWarning 
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.


@end

【问题讨论】：

However it is currently not working as I thought, any suggestions? 请详细说明或给我们错误日志之类的:(

【参考方案1】：

我认为您对pickerView:didSelectRow:inComponent 的实现需要添加更多逻辑。目前，它看起来会根据最后一个组件行组合来切换所有标签的文本。通过阅读您的描述，您似乎需要根据在特定组件中选择的行来设置标签。也许下面就是你所追求的。

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

    switch (component) 
        case 0:
            _label1.text = [othercolourArray objectAtIndex: row];
            break;
        case 1:
            _label2.text = [otherseasonArray objectAtIndex: row];
            break;
        case 2:
            _label3.text = [otherotherArray objectAtIndex: row];
            break;
        default:
            break;
    

【参考方案2】：

我发现问题，只需要更换：

_label1.text = [othercolourArray objectAtIndex: row];

与

_label1.text = [othercolourArray objectAtIndex: [pickerView selectedRowInComponent:0]];

其他组件等等，谢谢！