iphone - 如何让用户按下NEXT键并跳到ScrollView中的下一个UITextField

我有几个UITextFields，我的键盘上有一个“ NEXT”键作为返回键。我想让用户按下NEXT键并跳到下一个UITextField。我在网上阅读到，做到这一点的最佳方法是实现该功能：

-(BOOL)textFieldShouldReturn:(UITextField *)textField

我这样做了，但是对我来说不起作用。

请查看我的.m文件

#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

我正在逐步执行以下功能：

-(BOOL)textFieldShouldReturn:(UITextField *)textField

这是Console输出

TextField标签是6
[customerInfoViewController textFieldDidBeginEditing：]

[customerInfoViewController textFieldDidBeginEditing：]

[customerInfoViewController textFieldDidBeginEditing：]

[customerInfoViewController textFieldDidBeginEditing：]

[customerInfoViewController textFieldDidBeginEditing：]

[customerInfoViewController textFieldDidBeginEditing：]

最佳答案

首先，如果没有触发-(BOOL)textFieldShouldReturn:(UITextField *)textField，请确保文本字段具有类似name.delegate = self的内容；

其次，如果光标移至下一个字段，则需要实现

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

另外，如果在显示键盘时滚动视图的一部分在键盘下方，则您将希望缩小滚动视图的高度，以使键盘不重叠。