Ios 三相关选择器视图_Ios_Iphone_Objective C

Ios 三相关选择器视图

ios iphone objective-c

Ios 三相关选择器视图,ios,iphone,objective-c,Ios,Iphone,Objective C,我需要创建三个独立的pickerView。第一个pickerView是categoryPickerView。选择某个值时，应加载其他两个pickerView（productPickerview和modelPickerview）未正确加载数据正在触发didSelectRow回调，但my NSLog显示，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中为其编写了以下数组：- devicecatogery=[[NSArra

我需要创建三个独立的pickerView。第一个pickerView是categoryPickerView。选择某个值时，应加载其他两个pickerView（productPickerview和modelPickerview）未正确加载数据

正在触发didSelectRow回调，但my NSLog显示，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中为其编写了以下数组：-

 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picker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
}

这个代码对我来说没有意义，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都将进入此回调。首先，您没有检查标记以查看触发的是哪一个pickerView，然后检查所选行是否为音频/视频，如果是第二个/第三个pickers，代码将永远不会通过此操作，因为它们不会选择音频/视频

按照逻辑，如果选择了“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”

[productPickerView重新加载所有组件]commanProductArray

之后应该直接调用code>，因为您设置了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放置2或3个NSlog来发现，看看它是否进入了循环
编辑：
您的代码应该遵循以下内容：
- (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)
    {

    }
}

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

}

有关更多详细信息，请查看：
愿它对你有帮助
快乐编码…：）请描述“未相应加载”，显示任何内容，控件正在显示但没有数据，回调未被调用等。其他选择器视图未加载（productPickerview和modelPickerview）我的代码是否正确请帮助@Dhaval Bhadaniath categoryPickerView正在显示音频和视频，但当选择音频时，productPickerView不会显示walkman、mp3、ipod@SimonMcLoughlin@user2598751请发布更多的代码，我不明白你是如何根据代码/评论来实现这一点的。我们需要查看所有声明的变量和所有回调。我已经编辑了u@Simon McLoughlini的代码。我尝试使用NSLog，但它没有在“if”（[[categoryArray objectAtIndex:[categoryPickerView SelectedRowIncomonent:0]]isEqual:@“Audio”]{NSLog（@“1”）之后进入循环“西蒙McLoughlin@user2598751…因此，您发现NSlog没有打印，这意味着您的if语句不起作用，这意味着您发现了问题，但在问题中没有提到这一点为什么？为什么您甚至需要进行字符串比较，为什么不检查索引：if（pickerView.tag==1&&row==0）//第0行将等于audio@user2598751刚刚注意到：'isEqual:@“Audio”]'没有进行字符串比较，它应该是'IseQualString:@“Audio”]“我是根据的，但现在它不会进入第三个循环，即加载modelpickerview。它不会加载model@Simon的数组McLoughlin@user2598751我在回答中浏览了你的代码，并指出你所做的结构是错误的。我编辑了我的回答，以向你展示它的外观。你需要阅读我的代码注释你没有理解我说的，因为你没有试图理解其中的区别，你只是在寻找一份施舍，让别人给你代码，让它工作，作为证据，你似乎只是复制了我给出的代码，没有注意到它只有一个if语句是固定的
- (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

}