Как позволить пользователю нажать клавишу NEXT и перейти к следующему `UITextField` в ScrollView

Question

У меня есть несколько UITextFields, моя клавиатура имеет клавишу «NEXT» в качестве клавиши возврата. Я бы хотел, чтобы пользователь нажал СЛЕДУЮЩУЮ клавишу и перешел к следующему UITextField. Я читал в Интернете, что лучший способ сделать это - реализовать функцию:

-(BOOL)textFieldShouldReturn:(UITextField *)textField

Я сделал это, но у меня это не работает.

Пожалуйста, смотрите мой .m файл

#import "customerInfoViewController.h"

@implementation customerInfoViewController
@synthesize infoModel;

@synthesize Name;
@synthesize AptNum;
@synthesize Street1;
@synthesize Street2;
@synthesize City;
@synthesize Telephone;
@synthesize Email1;


@synthesize textFieldBeingEdited;
@synthesize scrollView;
@synthesize doneButton; 

CartSingleton *Cart;
//==============================================================================
-(void)viewWillAppear:(BOOL)animated
{
    NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification 
                                               object:nil/*self.view.window*/];
    [super viewWillAppear:animated];
    Cart = [CartSingleton getSingleton];


}
//==============================================================================
-(void)viewWillDisappear:(BOOL)animated
{
    NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:UIKeyboardWillShowNotification 
                                                  object:nil];
    [super viewWillDisappear:animated];

}
//==============================================================================
- (IBAction)textFieldDidBeginEditing:(UITextField *)textField
{
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    textFieldBeingEdited = textField;
}
//==============================================================================
-(IBAction)textFieldDoneEditing:(id)sender
{
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    textFieldBeingEdited = NULL;
    [sender resignFirstResponder];
    if (moveViewUp) 
       {
        [self scrollTheView:NO];
       }

}
//==============================================================================
-(BOOL)textFieldShouldReturn:(UITextField *)textField 
{
    NSLog(@"TextField tag is, %d ", textField.tag);
if ([self.Name isFirstResponder]) 
   {
    [self.AptNum becomeFirstResponder];
   }
if ([self.AptNum isFirstResponder]) 
   {
    [self.Street1 becomeFirstResponder];
   }
if ([self.Street1 isFirstResponder])
   {
    [self.Street2 becomeFirstResponder];
   }
if ([self.Street2 isFirstResponder])
   {
    [self.City becomeFirstResponder];
   }
if ([self.City isFirstResponder])
   {
    [self.Telephone becomeFirstResponder];
   }
if ([self.Telephone isFirstResponder])
   {
    [self.Email1 becomeFirstResponder];
   }
if ([self.Email1 isFirstResponder])
   {
    [self.Email1 resignFirstResponder];
   }
return YES;
}
//==============================================================================
-(void)keyboardWillShow:(NSNotification *)notif
{

    NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
NSDictionary *info = [notif userInfo];
NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
//NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
CGSize keyboardSize = [aValue CGRectValue].size;
float bottomPoint = (textFieldBeingEdited.frame.origin.y + textFieldBeingEdited.frame.size.height /*+ 20*/);
scrollAmount = keyboardSize.height - (self.view.frame.size.height- bottomPoint);
/*
 CGRect viewFrame = self.view.frame;
 viewFrame.size.height += keyboardSize.height;
 scrollView.frame = viewFrame;
 */
if(scrollAmount > 0)
   {
    moveViewUp = YES;
    [self scrollTheView:YES];
   }
else 
   {
    moveViewUp = NO;
   }

}
//==============================================================================
-(void)scrollTheView:(BOOL)movedUp
{
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    CGRect rect = self.view.frame;
    if(movedUp)
       {
        rect.origin.y -=scrollAmount;
       }
    else 
       {
        rect.origin.y +=scrollAmount;
       }
    self.view.frame = rect;
    [UIView commitAnimations];
}


//==============================================================================
- (void)viewDidLoad 
{
    [super viewDidLoad];
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);

    scrollView.contentSize = self.view.frame.size;

    textFieldBeingEdited = NULL;
    //If there is already 
    if (Cart.customerInfoObtained)
       {
        self.Name.text = Cart.customerInfo.Name;
        self.AptNum.text = Cart.customerInfo.AptNo;
        self.Street1.text = Cart.customerInfo.Street1;
        self.Street2.text = Cart.customerInfo.Street2;
        self.City.text = Cart.customerInfo.City;
        self.Telephone.text = Cart.customerInfo.Tel;
        self.Email1.text = Cart.customerInfo.Email;     
       }

}

//==============================================================================
-(IBAction)doneButtonPressed
{
    NSLog(@"Done button pressed ");
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    [self dismissModalViewControllerAnimated:YES];
    /*
    infoModel = [[customerInfoModel alloc] initWithObjects:self.Name.text
                                                     AptNo:self.AptNum.text
                                                   Street1:self.Street1.text
                                                   Street2:self.Street2.text
                                                      City:self.City.text
                                                       Tel:self.Telephone.text
                                                     Email:self.Email1.text]; 


    [Cart addCustomerInfo:infoModel];
    [self.navigationController popViewControllerAnimated:YES];
    */
}


//==============================================================================
- (void)didReceiveMemoryWarning 
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);

    // Release any cached data, images, etc. that aren't in use.
}
//==============================================================================
- (void)viewDidUnload 
{
    [super viewDidUnload];
        NSLog(@"%s %d %s", __FILE__, __LINE__, __FUNCTION__);
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
//==============================================================================

- (void)dealloc 
{
    NSLog(@"deallocating %@",self);
    [scrollView release];
    [super dealloc];
}
//==============================================================================

@end

Я пошагово выполняю функцию:

-(BOOL)textFieldShouldReturn:(UITextField *)textField 

а вот и консольный вывод

TextField tag is, 6 
[customerInfoViewController textFieldDidBeginEditing:]

[customerInfoViewController textFieldDidBeginEditing:]

[customerInfoViewController textFieldDidBeginEditing:]

[customerInfoViewController textFieldDidBeginEditing:]

[customerInfoViewController textFieldDidBeginEditing:]

[customerInfoViewController textFieldDidBeginEditing:]

Answer 1

Это работает для меня:

- (BOOL) textFieldShouldReturn:(UITextField *)textField {    // called when "Next" is pressed
    NSLog(@"textFieldShouldReturn");
    if (textField == nameField) {
        [streetAddressField becomeFirstResponder];
    } else if (textField == streetAddressField) {
        [cityField becomeFirstResponder];
    } else if (textField == cityField) {
        [stateField becomeFirstResponder];
    } else if (textField == stateField) {
        [zipField becomeFirstResponder];
    }
    return YES;
}

Answer 2

Шаги:

1) Соответствует UITextFieldDelegate

 @interface ViewControllerTest :UIViewController<UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *txtUserId;
@property (weak, nonatomic) IBOutlet UITextField *txtPassword;

@end

2) Назначить делегат текстового поля текущему контроллеру вида

 - (void)viewDidLoad
{
  [super viewDidLoad];


  self.txtUserId.delegate=self;

  self.txtUserId.tag=1;


  self.txtPassword.delegate=self;

  self.txtPassword.tag=2;
 }

3) Реализовать метод textFieldShouldReturn

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
  if(textField.tag==1)
  {
     [self.txtPassword becomeFirstResponder];
  }

  return TRUE;
}

Answer 3

Соедините вещи, во-первых, если сначала не запускается -(BOOL)textFieldShouldReturn:(UITextField *)textField, убедитесь, что в текстовых полях есть что-то вроде name.delegate = self;

Во-вторых, если курсор перемещается в следующее поле, вам нужно будет ввести

- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated

Кроме того, если часть экрана прокрутки находится ниже клавиатуры при отображении клавиатуры, вы захотите уменьшить высоту экрана прокрутки, чтобы клавиатура не перекрывалась.