UIPickerView没有返回正确的数据 [英] UIPickerView not returning the correct data

问题描述

我有一个主视图，其中包含一个landscapeview和一个portraitview，它被加载为包装器视图的子视图。横向视图和纵向视图都具有链接到它们的UIPickerView对象。在我的源代码中，我将它们全部作为属性，我还有一个景观和肖像选择器的包装器。它们定义为

I have a Main view with a landscapeview and a portraitview that gets loaded as subviews of the wrapper view. Both the landscape view and portraitview has UIPickerView objects that are linked to them. In my source I have them all as properties and I also have a wrapper for the landscape and portrait pickers. They are defined as

@property (nonatomic, retain, readonly) IBOutlet UIPickerView *pickerTown;
@property (nonatomic, retain, readonly) IBOutlet UIPickerView *pickerType;
@property (nonatomic, retain, readonly) IBOutlet UIDatePicker *pickerFrom;
@property (nonatomic, retain, readonly) IBOutlet UIDatePicker *pickerTo;

@property (nonatomic, retain) IBOutlet UIPickerView *landscapePickerTown;
@property (nonatomic, retain) IBOutlet UIPickerView *landscapePickerType;
@property (nonatomic, retain) IBOutlet UIDatePicker *landscapePickerFrom;
@property (nonatomic, retain) IBOutlet UIDatePicker *landscapePickerTo;

@property (nonatomic, retain) IBOutlet UIPickerView *portraitPickerTown;
@property (nonatomic, retain) IBOutlet UIPickerView *portraitPickerType;
@property (nonatomic, retain) IBOutlet UIDatePicker *portraitPickerFrom;
@property (nonatomic, retain) IBOutlet UIDatePicker *portraitPickerTo;

对于我有的每个只读包装

And for each of the readonly wrappers I have

- (UIPickerView *) pickerTown
{
    if(self.landscapeView.superview)
    {
        return landscapePickerTown;
    }else
    {
        return portraitPickerTown;
    }
}

但当我在肖像或风景时，我试着比如说

But when I am in portrait or landscape, and I try for instance to say

myHelper.selectedTown = [myHelper.towns objectAtIndex:[pickerTown selectedRowInComponent:0]];

我没有得到所选的值，只是数组中的第一个值。

I don't get the selected value but just the first value in the array.

数据添加如下：

if(pickerView == landscapePickerType || pickerView == portraitPickerType) {
    return [myHelper.types objectAtIndex:row];
}else if(pickerView == landscapePickerTown || pickerView == portraitPickerTown){
    return [myHelper.towns objectAtIndex:row]; 
}else
{
    return @"";
}

和数组：

myHelper = [Helper sharedManager];
[myHelper.types addObject:@"None"];
[myHelper.types addObject:@"Food & Wine"];
[myHelper.types addObject:@"Test"];
[myHelper.towns addObject:@"None"];
[myHelper.towns addObject:@"Vanderbijlpark"];
[myHelper.towns addObject:@"Test"];

我在这里做错了什么？

推荐答案

如果您只获得第一个元素，则表明 [pickerTown selectedRowInComponent：0] 正在评估为零，仅当 pickerTown 为 nil 时才会发生。这也很可能是由于插座没有连接。

If you are getting only the first element, it is indicative that [pickerTown selectedRowInComponent:0] is evaluating to zero always which will happen only if pickerTown is nil. That again is most likely due to outlet not being connected.

但在这种情况下，我认为您是直接访问实例变量而不是方法返回的值。如果您对 pickerTown 使用 @synthesize ，请将 @dynamic 。并将语句更改为 [self.pickerTown selectedRowInComponent：0] 以访问getter的值。

But in this case I think you are accessing the instance variable directly and not the value the method returns. If you are using @synthesize for pickerTown, make that @dynamic. And change the statement to [self.pickerTown selectedRowInComponent:0] to access the value of the getter.

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