如何从 iPhone 中 ScrollView 的子视图（UILabel）获取值答案

【问题标题】：how get values from subview(UILabel) of ScrollView in iphone如何从 iPhone 中 ScrollView 的子视图（UILabel）获取值
【发布时间】：2011-03-17 11:12:13
【问题描述】：

我在滚动视图中添加了 10 个标签（标签包含一些数据）。我想在特定位置获取标签的值。你能告诉我如何获取该位置的值吗？请对此提出建议编写我所写的代码。如何获取用户选择的语言的值

-(void)printLanguage
 {
    NSLog(@"in print language method");

    //int y=0;
   //NSMutableArray *languageArray=[[NSMutableArray alloc]initWithObjects:@"Chinese",@"Spanish",@"English",@"Arabic",@"Hindi",@"Bengali",@"Portuguese",@"Russian",@"Japanese",@"German",nil];
  //UILabel *languageLabel=[[UILabel alloc]initWithFrame:CGRectMake(0, y ,90,30 )];

  languagValue=0;

  int y=0;
  NSMutableArray *languageArray=[[NSMutableArray alloc]initWithObjects:@"Chinese",@"Spanish",@"English",@"Arabic",@"Hindi",@"Bengali",@"Portuguese",@"Russian",@"Japanese",@"German",nil]; 


for(languagValue=0;languagValue<[languageArray count];languagValue++)
{
    UILabel *languageLabel=[[UILabel alloc]initWithFrame:CGRectMake(0, y ,90,30 )];
    NSLog(@"array count is @%d",[languageArray count]);
    languageLabel.text=[languageArray objectAtIndex:languagValue];
    NSLog(@"array objectat index is @%@",[languageArray objectAtIndex:languagValue]);
    languageLabel.font=[UIFont systemFontOfSize:19.0];
    languageLabel.backgroundColor=[UIColor clearColor];
    [languageScrollView addSubview:languageLabel];
    //  [languageScrollView addSubview:languageLabel];
    //y+=90;        
    y+=languageLabel.frame.size.height;
    [languageLabel release];

}   

   [languageScrollView setShowsHorizontalScrollIndicator:NO];
   [languageScrollView setShowsVerticalScrollIndicator:NO];
   [languageScrollView setContentSize:CGSizeMake(genderScrollView.frame.size.width, y)];

}

谢谢，

girish

【问题讨论】：

标签： iphone objective-c cocoa-touch uiscrollview uilabel

【解决方案1】：

一定是有人设置了这些值，不是吗？ :) 当您必须首先知道标签才能设置标签时，为什么还要询问标签的值。

编辑：看到您的代码，您可能可以从滚动视图的contentOffset 中找出答案，但似乎您最好使用提供所有这些基础设施的UIPicker 或UITableView免费

【讨论】：

我将显示我的代码，你能解释一下我必须获得该特定用户选择值的值吗

【解决方案2】：

UILabel 不是交互式组件 Girish。所以你不能得到它的选择事件。更好地使用 UIButtons。我已经编辑了您的代码并添加了一种方法。只需将 languageArray 设为全局，代码就可以正常工作。

-(void)youMethod
{
    //int y=0;
    //NSMutableArray *languageArray=[[NSMutableArray alloc]initWithObjects:@"Chinese",@"Spanish",@"English",@"Arabic",@"Hindi",@"Bengali",@"Portuguese",@"Russian",@"Japanese",@"German",nil];
    //UILabel *languageLabel=[[UILabel alloc]initWithFrame:CGRectMake(0, y ,90,30 )];

    languagValue=0;

    int y=0;
    NSMutableArray *languageArray=[[NSMutableArray alloc]initWithObjects:@"Chinese",@"Spanish",@"English",@"Arabic",@"Hindi",@"Bengali",@"Portuguese",@"Russian",@"Japanese",@"German",nil]; 


    for(languagValue=0;languagValue<[languageArray count];languagValue++)
    {
         UILabel *languageLabel=[[UILabel alloc]initWithFrame:CGRectMake(0, y ,90,30 )];
         UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
         btn.frame = CGRectMake(0, y ,90,30 );
         btn.tag = languagValue;
         [btn addTarget:self action:@selector(languageSelected:) forControlEvents:UIControlEventTouchUpInside];
         NSLog(@"array count is @%d",[languageArray count]);
         languageLabel.text=[languageArray objectAtIndex:languagValue];
         NSLog(@"array objectat index is @%@",[languageArray objectAtIndex:languagValue]);
         languageLabel.font=[UIFont systemFontOfSize:19.0];
         languageLabel.backgroundColor=[UIColor clearColor];
         [languageScrollView addSubview:languageLabel];
         [languageScrollView addSubview:btn];
         //  [languageScrollView addSubview:languageLabel];
         //y+=90;        
         y+=languageLabel.frame.size.height;
         [languageLabel release];

         }   
         [languageScrollView setShowsHorizontalScrollIndicator:NO];
         [languageScrollView setShowsVerticalScrollIndicator:NO];

         [languageScrollView setContentSize:CGSizeMake(genderScrollView.frame.size.width, y)];

}

-(void)languageSelected:(id)sender
{
    UIButton * btn = (UIButton*)sender;
    int selectedIndex = btn.tag;
    NSString * selectedLanguage = [languageArray objectAtIndex:selectedIndex];
}

【讨论】：