DownPicker 选择时如何获取数组索引值

Posted 2023-02-24

【中文标题】DownPicker 选择时如何获取数组索引值

【英文标题】：DownPicker when selected how to get the Array Index Value

【发布时间】：2018-04-18 10:35:03

【问题描述】：

我已经按照link 安装了 DownPicker。选择项目时，我需要获取 NSMutableArray 索引值。背后的原因是我有 2 个数组。一个用于国家/地区，一个用于代码。当用户选择国家时，我需要获取索引值来获取代码。任何帮助都将不胜感激。

- (void)viewDidLoad

    [super viewDidLoad];

    //=== 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 web and get the return Country response.write
    appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    sURL = appDelegate.gURL;
    sURL = [sURL stringByAppendingString:@"/apps/getcountry.asp?"];

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

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

    //=== Pass the string to web and get the return Code response.write
    sURL = appDelegate.gURL;
    sURL = [sURL stringByAppendingString:@"/apps/getctcode.asp?"];

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

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

    self.pickerCountry = [[DownPicker alloc] initWithTextField:self.txtCountry withData:countryMArray];

【参考方案1】：

在viewDidLoad 中添加一个目标到pickerCountry

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

//

-(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])
         
             [self.pickerCode selectRow:i inComponent:0 animated:YES];

             break;
        

    

【参考方案2】：

当用户滚动时，添加目标。您将通过所需的方法获得回调，如下所示：

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


-(void)dp_Selected:(id)dp 
    NSString* selectedValue = [self.pickerCountry text];
    // do what you want
    //search the text to get index value

官方链接： https://github.com/Darkseal/DownPicker#status-change-event-handling