ios - 如果用户单击 UIPickerview，如何在 UITextField 中显示血型

Question

祝所有 iOS 开发者新年快乐。我想在 UITextfield 中显示血型。 所以我应该采用 UIPickerview 并附加血型列表。我的要求是，如果用户点击 UITextfiled 将显示 UIPickerview 并且用户选择血型，它将反射(reflect) UITextfield 中的血型项目。我正在尝试执行此功能。但是我在 UITextfield 中显示血型值时遇到了一些问题。问题是，例如，如果我单击 A-ve 血型，它将按 UITextfield 中的方式显示>.但是，如果我单击 A+ve 组，它将在 UITextfield 中显示为 A ve 而不是 A+ve。这是我的问题。请任何人帮助我。提前致谢。

下面给出的是我的代码。

//Bloodgroupviewcontroller.m

arrChooseServices=[[NSMutableArray alloc]initWithObjects:@"A+ve",@"A-ve",@"B+ve",@"B-ve",@"AB+ve",@"AB-ve",@"O+ve",@"O-ve", nil];

bloodGroup=[[UITextField alloc]initWithFrame:CGRectMake(150, 200, 120, 20)];

bloodGroup.borderStyle=UITextBorderStyleRoundedRect;

bloodGroup.backgroundColor=[UIColor clearColor];

bloodGroup.backgroundColor=[UIColor colorWithRed:0.662745 green:0.662745 blue:0.662745 alpha:0.5];

[bloodGroup setUserInteractionEnabled:NO];

bloodGroup.font=[UIFont systemFontOfSize:14.0];

bloodGroup.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter;

bloodGroup.textAlignment=NSTextAlignmentCenter;

bloodGroup.delegate=self;

bloodGroup.inputView=self.chooseServicePicker;

bloodGroup.inputAccessoryView=self.accessoryView;

[self.view addSubview:bloodGroup];


-(UIPickerView *)chooseServicePicker
{
   if(chooseServicePicker==nil)
   {

       chooseServicePicker=[[UIPickerView alloc]init];

       chooseServicePicker.delegate=self;

       chooseServicePicker.dataSource=self;

       chooseServicePicker.showsSelectionIndicator=YES;

     }
     return chooseServicePicker;
 }


 -(UIToolbar *)accessoryView
 {

      if ( accessoryView == nil )
      {
            accessoryView = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 30)];

             UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]  initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(onBloodGroupSelection)];

             UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancel)];

             accessoryView.items=[NSArray arrayWithObjects:doneButton,cancelButton, nil];
                 }
           return accessoryView;
      }


- (void)onBloodGroupSelection
{
    NSInteger row = [self.chooseServicePicker selectedRowInComponent:0];
    bloodGroup.text=[arrChooseServices objectAtIndex:row];
    [bloodGroup resignFirstResponder];
 }

Answer 1

关于 + 未显示，我测试了您的代码，它对我来说工作正常。我必须将 [bloodGroup setUserInteractionEnabled:NO]; 更改为 [bloodGroup setUserInteractionEnabled:YES]; 以使 UITextField 可点击。不过，请尝试添加

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component{
     bloodGroup.text = [arrChooseServices objectAtIndex:row] ;
}

添加到您的代码中，以便在点击 UIPickerView 时使 UITextField 更改文本。