三个依赖选择器视图

时间：2014-01-03 10:14:33

标签： ios iphone objective-c

我需要创建三个独立的pickerView。第一个pickerView是categoryPickerView。选择值时，应加载其他2个pickerView（productPickerview和modelPickerview）未正确加载数据。

didSelectRow回调被触发但我的NSLog已经证明它没有通过第一个if语句检查它是否等于“Audio”

对于catogeryPickerView，我在viewDidLoad中为它编写了以下数组： - 

 devicecatogery=[[NSArray alloc]initWithObjects:@"Audio",@"Video", nil];
//code for numeric keypad done button    
UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 44, 320, 300)];
numberToolbar.barStyle = UIBarStyleBlackTranslucent;
numberToolbar.items = [NSArray arrayWithObjects:
                       [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(cancelNumberPad)],
                       [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
                       [[UIBarButtonItem alloc]initWithTitle:@"Apply" style:UIBarButtonItemStyleDone target:self action:@selector(doneWithNumberPad)],
                       nil];
[numberToolbar sizeToFit];


// catogery pickerview
categoryPickerView=[[UIPickerView alloc]init];
categoryPickerView.delegate=self;
categoryPickerView.tag=1;
txtCategory.inputView=categoryPickerView;
txtCategory.inputAccessoryView=numberToolbar;

//product pickerview
productPickerView=[[UIPickerView alloc]init];
productPickerView.delegate=self;
productPickerView.tag=2;
txtProduct.inputView=productPickerView;
txtProduct.inputAccessoryView=numberToolbar;

//model pickerview
modelPickerView=[[UIPickerView alloc]init];
modelPickerView.delegate=self;
modelPickerView.tag=3;
txtModel.inputView=modelPickerView;
txtModel.inputAccessoryView=numberToolbar;

}//end of view did load

这是我的选择器视图事件： - 

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 1;
}

 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
if (pickerView.tag == 1) {
    return [devicecatogery count];  //<-----------this is for category picker view
}else if(pickerView.tag == 2)
    return [commanProductArray count];     //<-----------this is for product picker view
else
    return [commanModelArray count];  //<-------------- this is for model picker view
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
 {
if (pickerView.tag == 1)
    return [devicecatogery objectAtIndex:row];//<----this is for category picker view
else if (pickerView.tag == 2)
    return [commanProductArray objectAtIndex:row];//<--------this is for product picker view
else
    return [commanModelArray objectAtIndex:row];//<--------- this is for model picker view
}

这是我的didSelect回调：

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

    if ([[categoryArray objectAtIndex:[categoryPickerView selectedRowInComponent:0] ]            isEqual:@"Audio"]) {

        commanProductArray=[[NSMutableArray alloc]initWithObjects:@"walkman",@"mp3",@"ipod", nil];

        if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]] isEqual:@"walkman"]) {
            // walkman list display
            [productPickerView reloadAllComponents];

            commanModelArray=[[NSMutableArray alloc]initWithObjects:@"walkman1",@"walkman2",@"walkman3",@"walkman4", nil];
            [modelPickerView reloadAllComponents];
        }else if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]] isEqual:@"mp3"]){

           //mp3 list display
            [productPickerView reloadAllComponents];
            [modelPickerView reloadAllComponents];

            commanModelArray=[[NSMutableArray alloc]initWithObjects:@"mp3",@"mp3",@"mp3",@"mp3", nil];
        }else if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]] isEqual:@"ipod"]){
            //ipod list display
            [productPickerView reloadAllComponents];
            [modelPickerView reloadAllComponents];
            commanModelArray=[[NSMutableArray alloc]initWithObjects:@"ipod1",@"ipod2",@"ipod3",@"ipod4", nil];
        }        
    }else if ([[categoryArray objectAtIndex:[categoryPickerView selectedRowInComponent:0]] isEqual:@"Video"]){
        commanProductArray=[[NSMutableArray alloc]initWithObjects:@"TV",@"Moniter",@"Projector", nil];

        if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]]isEqual:@"TV"])  {
            //for tv model display
            [productPickerView reloadAllComponents];
            commanModelArray=[[NSMutableArray alloc]initWithObjects:@"TV1",@"TV2",@"TV3", nil];
            [modelPickerView reloadAllComponents];

        }else if ([[commanProductArray objectAtIndex:[productPickerView  selectedRowInComponent:0]]isEqual:@"Moniter"]){
            //for moniter model display
            [productPickerView reloadAllComponents];
        commanModelArray=[[NSMutableArray alloc]initWithObjects:@"Moniter1",@"Moniter2",@"Moniter3", nil];
            [modelPickerView reloadAllComponents];

        }else if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]] isEqual:@"Projector"]){
            //for projector display
            [productPickerView reloadAllComponents];
            commanModelArray=[[NSMutableArray alloc]initWithObjects:@"Projector1",@"Projector2",@"Projector3", nil];
            [modelPickerView reloadAllComponents];
        }
    }
}

2 个答案:

答案 0 :(得分：1)

这段代码对我没有意义，我怀疑你的问题在这里：

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

    if ([[categoryArray objectAtIndex:[categoryPickerView selectedRowInComponent:0] ]            isEqual:@"Audio"]) {

        commanProductArray=[[NSMutableArray alloc]initWithObjects:@"walkman",@"mp3",@"ipod", nil];

        if ([[commanProductArray objectAtIndex:[productPickerView selectedRowInComponent:0]] isEqual:@"walkman"]) {
            // walkman list display
            [productPickerView reloadAllComponents];

选中时，所有pickerView都会进入此回调。你首先没有检查标签，看看它是哪个pickerView，然后你检查选择的行是否是音频/视频，如果它是第二个/第三个选择器，代码永远不会通过它，因为它们不会有选择音频/视频。

遵循逻辑，如果选择“音频”，则将commanProductArray设置为给定值，然后在加载之前立即检查所选值是否等于“walkman”。

设置[productPickerView reloadAllComponents];后我应该直接调用

commanProductArray，因为你设置数组并在加载之前检查选择了哪个值。

这个问题可以通过简单地添加2个或3个NSlog来查看它是否已进入循环

修改

您的代码应遵循以下内容：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    // If first picker
    if(pickerView.tag == 1)
    {
        // If Audio
        if(row == 0)
        {
            // Load result for audio
        }
        // If Video
        else if (row == 1)
        {
            // load result for video
        }
    }
    // If second picker
    else if(pickerView.tag == 2)
    {
        // if Walkman
        if(row == 0)
        {
            // load result for walkman
        }

        // etc etc etc
    }
    else if (pickerView.tag == 3)
    {

    }
}

答案 1 :(得分：0)

试试这个：

- (void)viewDidLoad
{
    devicecatogery=[[NSArray alloc]initWithObjects:@"Audio",@"Video", nil];
    commanProductArray=[[NSMutableArray alloc]initWithObjects:@"walkman",@"mp3",@"ipod", nil];
    commanModelArray=[[NSMutableArray alloc]initWithObjects:@"walkman1",@"walkman2",@"walkman3",@"walkman4", nil];
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}


// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

    if (pickerView.tag==1) {
         return devicecatogery.count;
    }
    else if(pickerView.tag==2){
        return commanProductArray.count;
    }
    else if (pickerView.tag==3)
    {
        return commanModelArray.count;

    }
    return 0;
}

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSString *title;
    if (pickerView.tag==1)
    {
        title = [NSString stringWithFormat:@"%@",[devicecatogery objectAtIndex:row]];
    }
    else if (pickerView.tag==2)
    {
        if([categoryPickerView selectedRowInComponent:0]==0)
        {
            commanProductArray=[[NSMutableArray alloc]initWithObjects:@"walkman",@"mp3",@"ipod", nil];
        }
        else{
            commanProductArray=[[NSMutableArray alloc]initWithObjects:@"TV",@"Moniter",@"Projector", nil];
        }
        title = [NSString stringWithFormat:@"%@",[commanProductArray objectAtIndex:row]];
    }
    else if (pickerView.tag==3)
    {
          if ([[devicecatogery objectAtIndex:[categoryPickerView selectedRowInComponent:0]] isEqualToString:@"Audio"]) {

              if([productPickerview selectedRowInComponent:0]==0)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"walkman1",@"walkman2",@"walkman3",@"walkman4", nil];

              }
              else if([productPickerview selectedRowInComponent:0]==1)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"mp31",@"mp32",@"mp33",@"mp34", nil];

              }
              else if([productPickerview selectedRowInComponent:0]==2)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"ipod1",@"ipod2",@"ipod3",@"ipod4", nil];
              }

          }
          else
          {
              if([productPickerview selectedRowInComponent:0]==0)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"TV1",@"TV2",@"TV3",@"TV4", nil];
              }
              else if([productPickerview selectedRowInComponent:0]==1)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"Moniter1",@"Moniter2",@"Moniter3",@"Moniter4", nil];
              }
              else if([productPickerview selectedRowInComponent:0]==2)
              {
                  commanModelArray=[[NSMutableArray alloc]initWithObjects:@"Projector1",@"Projector2",@"Projector3",@"Projector4", nil];
              }

          }
        title = [NSString stringWithFormat:@"%@",[commanModelArray objectAtIndex:row]];
    }
    return title;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if (pickerView.tag==1)
    {
        [productPickerview reloadAllComponents];
        [modelPickerview reloadAllComponents];
    }
    if (pickerView.tag==2) {
        [modelPickerview reloadAllComponents];
    }
    // Handle the selection

}

有关详细信息，您需要查看它：Sample code

愿它能帮到你。

快乐的编码......：）

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