Ios 由于未捕获异常而终止应用程序'；NSInvalidArgumentException'；，原因:'-[主isEqualToString:]

我正在从web服务获取数据：

//temp1 is NSDictionary
//responseArr1 is NSMutableArray
for(temp1 in responseArr1)......., 
{
     quesTxt = [[temp1 objectForKey:@"question_text"] stringByReplacingOccurrencesOfString:@"%PROFILENAME%" withString:del.onlyFirstName];

     quesID = [temp1 objectForKey:@"idlife_stage_question"];

     Home *objHome=[[Home alloc] init];

     objHome.homeQuesTxt = quesTxt;
     objHome.homeQuesID = quesID;

     [quesArray addObject:objHome];

     //[quesArray addObject:[[temp1 objectForKey:@"question_text"] stringByReplacingOccurrencesOfString:@"%PROFILENAME%" withString:del.onlyFirstName]];//this works fine

        }

{
        "idlife_stage_question" = 35;
        "life_stage_idlife_stage" = 1;
        "profile_idprofile" = 0;
        "question_text" = "When %PROFILENAME% first smiled?";..//%PROFILENAME% replaces with user name which i have
        sequence = 34;
    }

当我尝试在picker视图中填充所有日期时，它会给出异常

选择器视图委托：

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UILabel *retval = (id)view;
    if (!retval) {
        retval= [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView rowSizeForComponent:component].width, [pickerView rowSizeForComponent:component].height)];
    }

    retval.text = [quesArray objectAtIndex:row];.........// **EXCEPTION HERE**...

    retval.font = [UIFont boldSystemFontOfSize:14];
    retval.numberOfLines = 3;

    return retval;
}

我的web服务示例：

//temp1 is NSDictionary
//responseArr1 is NSMutableArray
for(temp1 in responseArr1)......., 
{
     quesTxt = [[temp1 objectForKey:@"question_text"] stringByReplacingOccurrencesOfString:@"%PROFILENAME%" withString:del.onlyFirstName];

     quesID = [temp1 objectForKey:@"idlife_stage_question"];

     Home *objHome=[[Home alloc] init];

     objHome.homeQuesTxt = quesTxt;
     objHome.homeQuesID = quesID;

     [quesArray addObject:objHome];

     //[quesArray addObject:[[temp1 objectForKey:@"question_text"] stringByReplacingOccurrencesOfString:@"%PROFILENAME%" withString:del.onlyFirstName]];//this works fine

        }

{
        "idlife_stage_question" = 35;
        "life_stage_idlife_stage" = 1;
        "profile_idprofile" = 0;
        "question_text" = "When %PROFILENAME% first smiled?";..//%PROFILENAME% replaces with user name which i have
        sequence = 34;
    }

Home是NSObject的一个子类

请帮忙

retval.text = [quesArray objectAtIndex:row];

您正在访问

quesArray

这是：

[quesArray addObject:objHome]

objHome是：
Home*objHome=[[Home alloc]init]

错误就在这里，您试图将对象放入
retval
中，它需要一个
NSString

您需要将某物用作：

retval.text = [[quesArray objectAtIndex:row] homeQuesTxt]; //or anyother property that you want to show in text

您的
retval.text
是一个字符串，您正在为其分配一个对象

你可以这样做

 Home  *newHome=[quesArray objectAtIndex:row];

  retval.text=newHome.homeQuesTxt;

quesArray
中填充了
Home
对象

Home *home = quesArray[row];
retval.text = home.homeQuesTxt;

将断点放在代码上，并跟踪正确的崩溃点？向我们显示崩溃代码…您的Label.text是一个字符串，您正在为其分配一个对象。我同意@nsgulliver@nsgulliver：即使我同意，这也是我刚才回答的：）我已经提到retval.text=[quesArray objectAtIndex:row]；……//这里出现异常…谢谢，现在它显示数据，但当我滚动选取器时，它会引发另一个异常：由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'-[\uu NSCFConstantString homeQuesTxt]：未识别的选择器发送到实例0x1E72A8 HERE..retval.text=newHome.homeQuesTxt；检查如何在Home类中定义homeQuesTxt.like..@property（非原子，强）NSString*homeQuesTxt；您应该调试代码或设置断点，在赋值之前尝试将值强制转换为（NSString*）。另外，请检查您的标签是否未解除分配。嘿，Anoop，这对我很有帮助，但我还需要在数组中插入一个自定义行，该行每次在数组末尾都会显示。我该怎么做？@user2268539:数组中的自定义行是什么？你想在那里添加一些文本吗？是的……比如“创建你自己的问题”，但我正在使用[[quesArray objectAtIndex:row]homeQuesTxt]在选择器中显示数据？？uipicker是视图，你需要添加到模型中。