【问题标题】：Objective-C: Tap on UIDownPicker and get the value to UITextfieldObjective-C：点击 UIDownPicker 并获取 UITextfield 的值
【发布时间】：2023-03-13 04:41:01
【问题描述】：

我下面的代码将从服务器获取国家名称和国家代码并存储到2 NSMutablleMArray、countryMArray 和codeMArraycode。当用户选择txtCountry UITextField时，它会调用picker list，当用户选择国家并点击完成时，它将根据索引获取Country Code from codeMArray并输入txtCode UITexField

我希望用户能够在选择器列表中点击国家，而不是点击完成，该值将被转移到UITextField

我已经尝试过这个This Thread，但它不起作用。我的想法已经用完了，请帮忙。

RootViewController.h

#import <UIKit/UIKit.h>
#import "LoginViewController.h"
#import <DownPicker/UIDownPicker.h>

@protocol LoginViewProtocol <NSObject>

- (void)dismissAndLoginView;

@end

@interface RootViewController : UIViewController     <UITextFieldDelegate,UITableViewDelegate>
@property (strong, nonatomic) IBOutlet UITextField *txtCountry;
@property (weak, nonatomic) IBOutlet UIDownPicker *downCountry;
@property (strong, nonatomic) IBOutlet UITextField *txtCode;
@property (strong, nonatomic) IBOutlet UITextField *txtPhone;
@property (strong, nonatomic) NSMutableArray *countryMArray;
@property (strong, nonatomic) NSMutableArray *codeMArray;
@property (nonatomic) DownPicker *pickerCountry;

@end

RootViewController.m

#import "RootViewController.h"
#import <QuartzCore/QuartzCore.h>

@interface RootViewController (){
    NSString *sURL,*sResponseData, *sRemaining;
    NSString *sCode;

}
@end

@implementation RootViewController

@synthesize loginView;
@synthesize txtCountry,txtCode,txtPhone;
@synthesize countryMArray;
@synthesize codeMArray;

- (void)viewDidLoad
{
    [super viewDidLoad];

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];

    [self.view addGestureRecognizer:tap];

    //=== Initiallize the Mutable Array
    countryMArray = [[NSMutableArray alloc] init];
    codeMArray = [[NSMutableArray alloc] init];

    //=== Initialize the responseData Mutable Data
    self.responseData = [NSMutableData data];

    //=== Pass the string to server to get the return Country response.write
    appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    sURL = @"https://www.share-fitness.com";
    sURL = [sURL stringByAppendingString:@"/apps/getcountry.asp?"];

    NSURLRequest *requestCountry = [NSURLRequest requestWithURL:[NSURL URLWithString:sURL]];

    (void) [[NSURLConnection alloc] initWithRequest:requestCountry delegate:self];

    //=== Pass the string to server to get the return CountryCode
    sURL = @"https://www.share-fitness.com";
    sURL = [sURL stringByAppendingString:@"/apps/getctcode.asp?"];

    NSURLRequest *requestCode = [NSURLRequest requestWithURL:[NSURL URLWithString:sURL]];

    (void) [[NSURLConnection alloc] initWithRequest:requestCode delegate:self];

    //=== Initialie the picker ====
    self.pickerCountry = [[DownPicker alloc] initWithTextField:self.txtCountry withData:countryMArray];

    [self.pickerCountry addTarget:self
                       action:@selector(pickerClicked:)
             forControlEvents:UIControlEventValueChanged];

}



 //=== Pick the countryCode, when Country is selected based on Array Index
 -(void)pickerClicked:(id)dp {

    NSString* selectedValue = [self.pickerCountry text];

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

        NSString*item = [countryMArray objectAtIndex:i];

        if([item isEqualToString:selectedValue])
        {
            sCode = [codeMArray objectAtIndex:i];
            txtCode.text = [@"+"stringByAppendingString:sCode];

            break;
        }

    }
}

【问题讨论】：

标签： objective-c uigesturerecognizer uipickerview

【解决方案1】：

我不知道您为什么不将 didSelectRow 用于 PickerView。但！我有个主意。那这个呢？您已经使用 UITapGestureRecognizer 作为您的视图..so 首先，再制作一个 UITapGestureRecognizer 并在 pickerView 出现时添加 PickerView。其次，当用户触摸pickerView 中的单元格时触发pickerView 操作。以及何时将其从超级视图中删除。

  UITapGestureRecognizer *tap1;

初始化

self.tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissPicker)];

在显示pickerView的方法中..

[self.pickerView setHidden:NO];         
[self.pickerView addGestureRecognizer:tap1];

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

sCode = [NSString stringFormatWith:@"%+%@" , [codeMArray objectAtIndex:row]];
txtCode.text= sCode;

在dismissPicker中

self.textField.text = sCode;
[self.pickerView resignFirstResponder];
[self.pickerView setHidden:YES];
[self.tap1 removeFromSuperView];

【讨论】：

【解决方案2】：

尝试在表格视图单元格中显示您的响应，单击每个单元格时，您可以在新视图控制器的文本字段中显示数据

参考以下主题：

-UItableview -UItableview 代表（****） -自定义 UItableviewcell -不同的视图控制器 -导航控制器

【讨论】：