无法在同一个控制器中使用两个 UIPickerView
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【中文标题】无法在同一个控制器中使用两个 UIPickerView【英文标题】：Not able to use two UIPickerView in the same Controller 【发布时间】：2014-05-29 04:45:41 【问题描述】：我试图在一个 ViewController 中同时使用两个以上的 UIPickerView。每个 UIPickerView 都有不同的数据数组。我正在使用界面生成器来链接选择器。我想要的是，单击按钮后，我的 PickerView 将显示出来，用户可以从中选择数据。所选数据将出现在文本字段中。第一个 PickerView 工作正常，但是当我单击第二个 PickerView 时，值来自第一个数组，我无法编写条件。这是我所有的代码：
.h 文件
#import <UIKit/UIKit.h>
@interface Tabbar2ViewController : UIViewController<UITextViewDelegate,UITextFieldDelegate,UIPickerViewDataSource,UIPickerViewDelegate>
IBOutlet UIPickerView *genderPickerView;
IBOutlet UIPickerView *pickerViewoption;
IBOutlet UIButton *BrandPickerBtn;
IBOutlet UIButton *genderPickerfBtn;
NSArray *brands;
NSArray *gender;
BOOL isCheckedpickerView;
IBOutlet UILabel *BrandLabelfield;
IBOutlet UILabel *GenderLabelfield;
- (IBAction)action:(id)sender;
- (IBAction)genderAction:(id)sender;
@property(nonatomic,retain)NSArray *brands;
@property(nonatomic,retain)NSArray *gender;
@end
.m 文件
#import "ttViewController.h"
@interface ttViewController ()
@end
@implementation ttViewController
@synthesize countries,size,brands,gender,activity,condition,color;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
// Custom initialization
return self;
- (void)viewDidLoad
[super viewDidLoad];
isCheckedpickerView=FALSE;
pickerViewoption.hidden=YES;
genderPickerView.hidden=YES;
activityPickerView.hidden=YES;
conditionPickerView.hidden=YES;
sizeandquantityPickerView.hidden=YES;
BrandLabelfield = [[UILabel alloc] initWithFrame:CGRectMake(20, 812, 253, 35)];
BrandLabelfield.textColor = [UIColor lightGrayColor];
BrandLabelfield.text=@"Brand";
BrandLabelfield.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"header_01.png"]];
BrandLabelfield.font = [UIFont fontWithName:@"Open Sans" size:14];
[tabView1 addSubview:BrandLabelfield];
//GenderTextfield with Label //
GenderLabelfield = [[UILabel alloc] initWithFrame:CGRectMake(20, 865, 253, 35)];
GenderLabelfield.textColor = [UIColor lightGrayColor];
GenderLabelfield.text=@"Gender";
GenderLabelfield.font = [UIFont fontWithName:@"Open Sans" size:14];
[tabView1 addSubview:GenderLabelfield];
//ColorTextfield with Label //
ConditionLabelfield = [[UILabel alloc] initWithFrame:CGRectMake(20, 1113, 253, 35)];
ConditionLabelfield.textColor = [UIColor lightGrayColor];
ConditionLabelfield.text=@"Color";
ConditionLabelfield.font = [UIFont fontWithName:@"Open Sans" size:14];
[tabView1 addSubview:ConditionLabelfield];
brands=[[NSArray alloc]initWithObjects:@"Nike",@"Bata",@"Adidas", nil];
gender=[[NSArray alloc]initWithObjects:@"Male",@"Female",@"Unisex", nil];
activity=[[NSArray alloc]initWithObjects:@"BASEBALL",@"BASKETBALL",@"FOOTBALL",@"GOLF",@"RUNNING",@"SKATING",@"SOCCER",@"SPORTS & OUTDOOR",@"TENNIS",@"TRAINING",@"VOLLEY BALL",@"WRESTLING", nil];
// Custom PICKER VIEWS //
pickerViewoption=[[UIPickerView alloc]initWithFrame:CGRectMake(13, 852, 290, 41)];
pickerViewoption.showsSelectionIndicator = YES;
pickerViewoption.delegate = self;
pickerViewoption.dataSource=self;
pickerViewoption.hidden=YES;
[pickerViewoption setBackgroundColor:[UIColor lightGrayColor]];
[tabView1 addSubview:pickerViewoption];
genderPickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(13, 906, 290, 41)];
genderPickerView.showsSelectionIndicator = YES;
genderPickerView.delegate = self;
genderPickerView.dataSource=self;
genderPickerView.hidden=YES;
[genderPickerView setBackgroundColor:[UIColor lightGrayColor]];
[tabView1 addSubview:genderPickerView];
activityPickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(13, 954, 290, 41)];
activityPickerView.showsSelectionIndicator = YES;
activityPickerView.delegate = self;
activityPickerView.dataSource=self;
activityPickerView.hidden=YES;
[activityPickerView setBackgroundColor:[UIColor lightGrayColor]];
[tabView1 addSubview:activityPickerView];
pickerViewoption.tag=1;
genderPickerView.tag=2;
activityPickerView.tag=3;
BrandPickerBtn.tag=000;
genderPickerfBtn.tag=111;
activityPickerBtn.tag=222;
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
return 1;
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row
forComponent:(NSInteger)component
NSString *string;
if (pickerViewoption.tag==1)
[tabView1 addSubview:pickerViewoption];
string=[self.brands objectAtIndex:row];
else
[tabView1 addSubview:genderPickerView];
string=[self.gender objectAtIndex:row];
else if (genderPickerView.tag==2)
[tabView1 addSubview:genderPickerView];
string=[self.gender objectAtIndex:row];
else if (activityPickerView.tag==3)
[tabView1 addSubview:activityPickerView];
string=[self.activity objectAtIndex:row];
return string;
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
if (pickerViewoption.tag==1)
BrandLabelfield.text=@"";
BrandLabelfield.text=[brands objectAtIndex:row];
BrandLabelfield.textColor=[UIColor whiteColor];
pickerViewoption.hidden=YES;
else if (genderPickerView.tag==2)
GenderLabelfield.text=@"";
GenderLabelfield.text=[gender objectAtIndex:row];
GenderLabelfield.textColor=[UIColor whiteColor];
else if (activityPickerView.tag==3)
ActivityLabelfield.text=@"";
ActivityLabelfield.text=[activity objectAtIndex:row];
ActivityLabelfield.textColor=[UIColor whiteColor];
- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
if (pickerViewoption.tag==1)
return [brands count];
else if (genderPickerView.tag==2)
return [gender count];
else if (activityPickerView.tag==3)
return [activity count];
return 0;
- (IBAction)action:(id)sender;
if (isCheckedpickerView==FALSE)
pickerViewoption.hidden=NO;
isCheckedpickerView=TRUE;
else
isCheckedpickerView=FALSE;
pickerViewoption.hidden=YES;
- (IBAction)genderAction:(id)sender
if (isCheckedpickerView==FALSE)
genderPickerView.hidden=NO;
isCheckedpickerView=TRUE;
else
isCheckedpickerView=FALSE;
genderPickerView.hidden=YES;
-(BOOL)textFieldShouldReturn:(UITextField *)textField
[textField resignFirstResponder];
return YES;
- (void)didReceiveMemoryWarning
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
@end
【问题讨论】：
旁注 - 为什么每次请求选择器视图的标题时，您会一遍又一遍地将每个选择器添加为子视图？这简直是愚蠢的。 旁注2：如果您使用IB创建选择器视图并将它们分配给出口，为什么还要在代码中创建选择器视图（替换在IB中创建的）？ @rmaddy 是的，它被分配了已经在 IB 中分配的选择器。 【参考方案1】：目前您正在检查委托方法中的错误条件，替换以下 3 个方法在 .m 文件中：
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row
forComponent:(NSInteger)component
NSString *string;
if (pickerView.tag==1)
[tabView1 addSubview:pickerViewoption];
string=[self.brands objectAtIndex:row];
else if (pickerView.tag==2)
[tabView1 addSubview:genderPickerView];
string=[self.gender objectAtIndex:row];
else if (pickerView.tag==3)
[tabView1 addSubview:activityPickerView];
string=[self.activity objectAtIndex:row];
else
[tabView1 addSubview:genderPickerView];
string=[self.gender objectAtIndex:row];
return string;
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
if (thePickerView.tag==1)
BrandLabelfield.text=@"";
BrandLabelfield.text=[brands objectAtIndex:row];
BrandLabelfield.textColor=[UIColor whiteColor];
pickerViewoption.hidden=YES;
else if (thePickerView.tag==2)
GenderLabelfield.text=@"";
GenderLabelfield.text=[gender objectAtIndex:row];
GenderLabelfield.textColor=[UIColor whiteColor];
else if (thePickerView.tag==3)
ActivityLabelfield.text=@"";
ActivityLabelfield.text=[activity objectAtIndex:row];
ActivityLabelfield.textColor=[UIColor whiteColor];
- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
if (pickerView.tag==1)
return [brands count];
else if (pickerView.tag==2)
return [gender count];
else if (pickerView.tag==3)
return [activity count];
return 0;
【讨论】：
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 我需要改变什么 检查该方法中的 if else 条件 这里的pickerView是什么。在可能的情况下。 pickerview 名称（第一个 pickerview ， secondpickerview 等）@iPhone Dev pickerView 是一个本地方法对象。 我没听懂你在说什么以上是关于无法在同一个控制器中使用两个 UIPickerView的主要内容，如果未能解决你的问题，请参考以下文章