Ios8 UIDatePicker在iOS 8中不可见

我对日期选择器有一个问题，即

UIDatePicker

在除iOS 8之外的所有版本中都工作正常

代码：

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我在iOS模拟器上也看到了同样的问题——在iOS 7中工作，但在iOS 8中没有。要解决这个问题，请选择iOS模拟器的硬件菜单，然后选择键盘->切换软件键盘。

在Xcode 6.0.1中，这对我来说是一个模拟器问题。这在设备（iPhone4S和iOS8发行版）上有效。如前一位用户所述，以下步骤使日期选择器在iOS 8模拟器上对我可见

• 启动模拟器和应用程序，并单击以日期选择器作为输入视图的字段

• 现在按下CMD+K（硬件->键盘->切换软件键盘），日期选择器变为可见

---

同样，这是一个仅限于模拟器的问题，该问题没有在设备上出现。

我也遇到了这个问题，现在我通过以下两种不同的方法解决了这个问题：

1） 。我没有使用

UIActionSheet

，而是使用了定制的

UIView

。只是将日期选择器添加到视图中，并显示和取消。也请参阅此

2） 。我已经检查了以下条件：如果操作系统版本大于8.0，如果没有，我使用了

UIActionSheet

和else

UIAlertViewController

。将选择器控制器添加为子视图

id ageActionSheet;

    if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0"))
    {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];

        UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"" style:UIAlertActionStyleDefault handler:nil];
        [alertController addAction:alertAction];
        [alertController addAction:alertAction];
        [alertController addAction:alertAction];
        [alertController addAction:alertAction];

        ageToolbar.frame = CGRectMake(-8,0, 320, 45);
        ageTitleLbl.frame = CGRectMake(50, 3, 200, 40);
        picker.frame = CGRectMake(-20, 45, 360, frame.size.height - 50 );

        [alertController.view addSubview:ageToolbar];
        [alertController.view addSubview:ageTitleLbl];
        [alertController.view addSubview:picker];

        ageActionSheet = alertController;
    }
    else
    {
        ageActionSheet = [[UIActionSheet alloc]initWithTitle:nil delegate:nil cancelButtonTitle:@"" destructiveButtonTitle:nil otherButtonTitles: nil];
        [ageActionSheet addSubview:ageToolbar];
        [ageActionSheet addSubview:ageTitleLbl];
        [ageActionSheet addSubview:picker];
        [ageActionSheet sizeToFit];
    }

---

只是在切换软件键盘上没什么。。在

在模拟器中打开时，只需转到

Hardware >> Keyboard >> Toggle SOftware Keyboard...

---

由于iOS8中不推荐使用UIActionSheet，因此必须使用其他视图来保存UIDatePicker和UIToolBar。。。在这个答案中，我使用UIView来保存上述UI对象

@interface ViewController ()<UIActionSheetDelegate, UITextFieldDelegate>{ 

   UIActionSheet *pickerViewActionSheet;
   UIDatePicker *datePicker;
   UIToolbar *pickerToolbar;       
   UIView *dateView;
}
@property (strong, nonatomic) IBOutlet UITextField *dateOfBirthTextField;
@end


@implementation ViewController

-(void)textFieldDidBeginEditing:(UITextField *)textField{
    if(textField == self.dateOfBirthTextField){        
    [textField resignFirstResponder];
    float platformVersion = 8.0;
    //Check for iOS 8.0+
    if([[[UIDevice currentDevice] systemVersion] floatValue ] >= platformVersion){

        // iOS8 DatePicker view implementation
        dateView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height/2.0, 320, 640)];
        pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
        pickerToolbar.barStyle=UIBarStyleBlackOpaque;
        [pickerToolbar sizeToFit];
        NSMutableArray *barItems = [[NSMutableArray alloc] init];
        UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dateChosen:)];
        [barItems addObject:barButtonItem];
        barButtonItem.tag = 123;
        [pickerToolbar setItems:barItems animated:YES];
        [dateView addSubview:pickerToolbar];
        datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 44.0, 320.0, 300.0)];
        datePicker.datePickerMode = UIDatePickerModeDate;
        [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];            
        datePicker.backgroundColor = [UIColor whiteColor];
        [dateView addSubview:datePicker];


        [self.view addSubview:dateView];

    }
    else { 
        //Pre iOS8.0 "usual" DatePicker implementation.           
        datePicker = [[UIDatePicker alloc] init];

        pickerViewActionSheet = [[UIActionSheet alloc] initWithTitle:@"Select the date!"
                                                     delegate:self
                                            cancelButtonTitle:nil
                                       destructiveButtonTitle:nil
                                            otherButtonTitles:nil];

        datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 44.0, 320.0, 300.0)];
        datePicker.datePickerMode = UIDatePickerModeDate;
        [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];
        datePicker.tag = -1;
        pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
        pickerToolbar.barStyle=UIBarStyleBlackOpaque;
        [pickerToolbar sizeToFit];
        NSMutableArray *barItems = [[NSMutableArray alloc] init];
        UIBarButtonItem *batButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneButtonClicked)];
        [barItems addObject:batButtonItem];

        [pickerToolbar setItems:barItems animated:YES];
        [pickerViewActionSheet addSubview:pickerToolbar];
        [pickerViewActionSheet addSubview:datePicker];
        [pickerViewActionSheet showInView:self.view];
        [pickerViewActionSheet setBounds:CGRectMake(0,0,320, 464)];

       }

    }
}

//iOS8.0+ when the date has chosen, remove the corresponding view from the parent view.
-(void) dateChosen:(UIBarButtonItem *) barButton {
     if(barButton.tag ==123){
        [dateView removeFromSuperview];

     }

  }

 //Get the chosen date from the UIDatePicker to the corresponding UITextField.
 -(void)dateChanged{
     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
     dateFormatter = [[NSDateFormatter alloc] init];
     [dateFormatter setDateFormat:@"dd/MM/yyyy"];
     self.dateOfBirthTextField.text = [dateFormatter stringFromDate:[datePicker date]];
  }

 //Pre iOS8.0 for closing the actionsheet
 -(BOOL)closeDatePicker:(id)sender{
     [pickerViewActionSheet dismissWithClickedButtonIndex:0 animated:YES];
     [self.dateOfBirthTextField resignFirstResponder];
     return YES;
  }

 //Pre iOS8.0
 -(void)doneButtonClicked{
     [self closeDatePicker:self];
  }
 @end

@interface ViewController（）{
UIActionSheet*PickServiceActionSheet；
UIDatePicker*日期选择器；
UIToolbar*选择器Toolbar；
UIView*日期视图；
}
@属性（强，非原子）IBOutlet UITextField*dateOfBirthTextField；
@结束
@实现视图控制器
-（无效）textFieldDidBeginEditing:（UITextField*）textField{
如果（textField==self.dateOfBirthTextField）{
[textField resignFirstResponder]；
浮动平台版本=8.0；
//检查iOS 8.0+
if（[[[UIDevice currentDevice]systemVersion]floatValue]>=platformVersion）{
//iOS8日期选择器视图实现
dateView=[[UIView alloc]initWithFrame:CGRectMake（0，self.view.frame.size.height/2.0320640）]；
pickerToolbar=[[UIToolbar alloc]initWithFrame:CGRectMake（0,0320,44）]；
pickerToolbar.barStyle=UIBarStyleBlack不透明；
[pickerToolbar sizeToFit]；
NSMUTABLEARRY*barItems=[[NSMUTABLEARRY alloc]init]；
UIBarButtonItem*barButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:uiBarButtonSystemItem目标：自我操作：@selector（DateSelected:）]；
[巴利坦人添加对象：巴布通教派]；
barButtonItem.tag=123；
[pickerToolbar设置项：barItems动画：是]；
[日期视图添加子视图：选择器工具栏]；
datePicker=[[UIDatePicker alloc]initWithFrame:CGRectMake（0.0,44.0,320.0,300.0）]；
datePicker.datePickerMode=UIDatePickerModeDate；
[datePicker addTarget:self action:@selector（dateChanged）for ControlEvents:UIControlEventValueChanged]；
datePicker.backgroundColor=[UIColor whiteColor]；
[日期视图添加子视图：日期选择器]；
[self.view addSubview:dateView]；
}
否则{
//iOS8.0之前的“常规”日期选择器实现。
datePicker=[[UIDatePicker alloc]init]；
PickerViewSheet=[[UIActionSheet alloc]initWithTitle:@“选择日期！”
代表：赛尔夫
取消按钮：无
破坏性按钮：无
其他按钮：无]；
datePicker=[[UIDatePicker alloc]initWithFrame:CGRectMake（0.0,44.0,320.0,300.0）]；
datePicker.datePickerMode=UIDatePickerModeDate；
[datePicker addTarget:self action:@selector（dateChanged）for ControlEvents:UIControlEventValueChanged]；
datePicker.tag=-1；
pickerToolbar=[[UIToolbar alloc]initWithFrame:CGRectMake（0,0320,44）]；
pickerToolbar.barStyle=UIBarStyleBlack不透明；
[pickerToolbar sizeToFit]；
NSMUTABLEARRY*barItems=[[NSMUTABLEARRY alloc]init]；
UIBarButtonItem*batButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:uiBarButtonSystemItem完成目标：自我操作：@selector（doneButtonClicked）]；
[barItems addObject:batButtonItem]；
[pickerToolbar设置项：barItems动画：是]；
[PickerActionSheet addSubview:pickerToolbar]；
[PickServiceWactionSheet addSubview:datePicker]；
[PickServiceWactionSheet showInView:self.view]；
[PickServiceActionSheet setBounds:CGRectMake（0,0320464）]；
}
}
}
//iOS8.0+选择日期后，从父视图中删除相应的视图。
-（无效）日期选择：（UIBarButtonItem*）barButton{
if（barButton.tag==123）{
[日期视图从SuperView移除]；
}
}
//将所选日期从UIDatePicker获取到相应的UITextField。
-（作废）更改日期{
NSDateFormatter*dateFormatter=[[NSDateFormatter alloc]init]；
dateFormatter=[[NSDateFormatter alloc]init]；
[日期格式化程序setDateFormat:@“dd/MM/yyyy”]；
self.dateOfBirthTextField.text=[dateFormatter stringFromDate:[datePicker date]]；
}
//iOS8.0之前版本，用于关闭操作表
-（BOOL）closeDatePicker:（id）发送方{
[PickServiceActionSheet使用Clicked按钮解除索引：0动画：是]；
[self.dateOfBirthTextField辞职第一响应者]；
返回YES；
}
//iOS8.0之前
-（无效）doneButtonClicked{
[自关闭日期选择器：self]；
}
@结束

---

我希望这有助于……

您可以参考一个关于如何使用swift在创建/使用UIPickerView和UIDatePicker的示例

@interface ViewController ()<UIActionSheetDelegate, UITextFieldDelegate>{ 

   UIActionSheet *pickerViewActionSheet;
   UIDatePicker *datePicker;
   UIToolbar *pickerToolbar;       
   UIView *dateView;
}
@property (strong, nonatomic) IBOutlet UITextField *dateOfBirthTextField;
@end


@implementation ViewController

-(void)textFieldDidBeginEditing:(UITextField *)textField{
    if(textField == self.dateOfBirthTextField){        
    [textField resignFirstResponder];
    float platformVersion = 8.0;
    //Check for iOS 8.0+
    if([[[UIDevice currentDevice] systemVersion] floatValue ] >= platformVersion){

        // iOS8 DatePicker view implementation
        dateView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height/2.0, 320, 640)];
        pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
        pickerToolbar.barStyle=UIBarStyleBlackOpaque;
        [pickerToolbar sizeToFit];
        NSMutableArray *barItems = [[NSMutableArray alloc] init];
        UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dateChosen:)];
        [barItems addObject:barButtonItem];
        barButtonItem.tag = 123;
        [pickerToolbar setItems:barItems animated:YES];
        [dateView addSubview:pickerToolbar];
        datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 44.0, 320.0, 300.0)];
        datePicker.datePickerMode = UIDatePickerModeDate;
        [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];            
        datePicker.backgroundColor = [UIColor whiteColor];
        [dateView addSubview:datePicker];


        [self.view addSubview:dateView];

    }
    else { 
        //Pre iOS8.0 "usual" DatePicker implementation.           
        datePicker = [[UIDatePicker alloc] init];

        pickerViewActionSheet = [[UIActionSheet alloc] initWithTitle:@"Select the date!"
                                                     delegate:self
                                            cancelButtonTitle:nil
                                       destructiveButtonTitle:nil
                                            otherButtonTitles:nil];

        datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 44.0, 320.0, 300.0)];
        datePicker.datePickerMode = UIDatePickerModeDate;
        [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];
        datePicker.tag = -1;
        pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
        pickerToolbar.barStyle=UIBarStyleBlackOpaque;
        [pickerToolbar sizeToFit];
        NSMutableArray *barItems = [[NSMutableArray alloc] init];
        UIBarButtonItem *batButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneButtonClicked)];
        [barItems addObject:batButtonItem];

        [pickerToolbar setItems:barItems animated:YES];
        [pickerViewActionSheet addSubview:pickerToolbar];
        [pickerViewActionSheet addSubview:datePicker];
        [pickerViewActionSheet showInView:self.view];
        [pickerViewActionSheet setBounds:CGRectMake(0,0,320, 464)];

       }

    }
}

//iOS8.0+ when the date has chosen, remove the corresponding view from the parent view.
-(void) dateChosen:(UIBarButtonItem *) barButton {
     if(barButton.tag ==123){
        [dateView removeFromSuperview];

     }

  }

 //Get the chosen date from the UIDatePicker to the corresponding UITextField.
 -(void)dateChanged{
     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
     dateFormatter = [[NSDateFormatter alloc] init];
     [dateFormatter setDateFormat:@"dd/MM/yyyy"];
     self.dateOfBirthTextField.text = [dateFormatter stringFromDate:[datePicker date]];
  }

 //Pre iOS8.0 for closing the actionsheet
 -(BOOL)closeDatePicker:(id)sender{
     [pickerViewActionSheet dismissWithClickedButtonIndex:0 animated:YES];
     [self.dateOfBirthTextField resignFirstResponder];
     return YES;
  }

 //Pre iOS8.0
 -(void)doneButtonClicked{
     [self closeDatePicker:self];
  }
 @end