我有一个Verification ViewController，我通过短信获得 4 位验证码，我需要输入这些验证码才能登录，我创建了ViewController这样的
如您所见，四个UITextFields，我只需要为每个 s 允许一个数字UITextField，
我尝试了什么：我试图使用shouldChangeCharactersInRange:method:，但它没有被调用，我不知道出了什么问题，我认为因为UITextFields 在UITableView所以它不起作用。
您可以通过使用文本字段的委托功能来更改文本字段。最初，您需要设置每个文本字段的委托和标签。
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ((textField.text.length >= 1) && (string.length > 0))
{
NSInteger nextTag = textField.tag + 1;
// Try to find next responder
UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
if (! nextResponder)
nextResponder = [textField.superview viewWithTag:1];
if (nextResponder)
// Found next responder, so set it.
[nextResponder becomeFirstResponder];
return NO;
}
return YES;
}
斯威夫特 2
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// On inputing value to textfield
if (textField.text?.characters.count < 1 && string.characters.count > 0){
let nextTag = textField.tag + 1;
// get next responder
var nextResponder = textField.superview?.viewWithTag(nextTag);
if (nextResponder == nil){
nextResponder = textField.superview?.viewWithTag(1);
}
textField.text = string;
nextResponder?.becomeFirstResponder();
return false;
}
else if (textField.text?.characters.count >= 1 && string.characters.count == 0){
// on deleting value from Textfield
let previousTag = textField.tag - 1;
// get next responder
var previousResponder = textField.superview?.viewWithTag(previousTag);
if (previousResponder == nil){
previousResponder = textField.superview?.viewWithTag(1);
}
textField.text = "";
previousResponder?.becomeFirstResponder();
return false;
}
return true;
}
斯威夫特 4
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField.text!.count < 1 && string.count > 0{
let nextTag = textField.tag + 1
// get next responder
var nextResponder = textField.superview?.viewWithTag(nextTag)
if (nextResponder == nil){
nextResponder = textField.superview?.viewWithTag(1)
}
textField.text = string
nextResponder?.becomeFirstResponder()
return false
}
else if textField.text!.count >= 1 && string.count == 0{
// on deleting value from Textfield
let previousTag = textField.tag - 1
// get next responder
var previousResponder = textField.superview?.viewWithTag(previousTag)
if (previousResponder == nil){
previousResponder = textField.superview?.viewWithTag(1)
}
textField.text = ""
previousResponder?.becomeFirstResponder()
return false
}
return true
}
如果您不想使用标签，请使用此代码，它比上面的效果更好
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// On inputing value to textfield
if ((textField.text?.characters.count)! < 1 && string.characters.count > 0){
if(textField == txtOne)
{
txtTwo.becomeFirstResponder()
}
if(textField == txtTwo)
{
txtThree.becomeFirstResponder()
}
if(textField == txtThree)
{
txtFour.becomeFirstResponder()
}
textField.text = string
return false
}
else if ((textField.text?.characters.count)! >= 1 && string.characters.count == 0){
// on deleting value from Textfield
if(textField == txtTwo)
{
txtOne.becomeFirstResponder()
}
if(textField == txtThree)
{
txtTwo.becomeFirstResponder()
}
if(textField == txtFour)
{
txtThree.becomeFirstResponder()
}
textField.text = ""
return false
}
else if ((textField.text?.characters.count)! >= 1 )
{
textField.text = string
return false
}
return true
}
我已经为两个图像拍摄了一个隐藏文本字段和四个图像视图。一个用于空白，另一个用于 Bullet，与 iOS 默认设置相同。
还为四个图像视图设置标签。
On Load set Focus for Pin Code
- (void)startPinCode
{
txtPinCodeLockDigits.text = @"";
for (int i = 1; i <= 4; i++) {
UIImageView *img = (UIImageView *)[self.view viewWithTag:i];
[img setImage:[UIImage imageNamed:@"Img_BG_PinCode.png"]];
}
[txtPinCodeLockDigits becomeFirstResponder];
}
然后根据用户输入更改 imageview 的图像，并且只允许四个字符
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSString *result = [textField.text stringByReplacingCharactersInRange:range withString:string];
textField.text = result;
for (int i = 1; i <= 4; i++) {
UIImageView *img = (UIImageView *)[self.view viewWithTag:i];
if (i <= [result length])
[img setImage:[UIImage imageNamed:@"Img_BG_PinCode_Filled.png"]];
else
[img setImage:[UIImage imageNamed:@"Img_BG_PinCode.png"]];
}
NSLog(@"Result :: %@", result);
if ([result length] == 4) {
[self performSelector:@selector(keyGenerationForApplication:) withObject:result afterDelay:0.2];
}
return NO;
}
生成 PIN 码的四个字符后调用函数并将其存储在与 iOS 默认 PIN 设置相同的用户默认值中
- (void)keyGenerationForApplication:(NSString *)pinCode
{
int appCode = [pinCode intValue];
[DefaultsValues setIntegerValueToUserDefaults:appCode ForKey:PIN_LOCK_PATTERN];
}
在这里，您可以再次调用StartPinCode方法重新确认代码。
希望它会帮助你。
谢谢
斯威夫特 4
灵感来自@Anurag Soni 和@Varun Naharia 答案
变体 A
extension EnterConfirmationCodeTextField: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
guard let textFieldCount = textField.text?.count else { return false }
// Сlosure
let setValueAndMoveForward = {
textField.text = string
let nextTag = textField.tag + 1
if let nextResponder = textField.superview?.viewWithTag(nextTag) {
nextResponder.becomeFirstResponder()
}
}
// Сlosure
let clearValueAndMoveBack = {
textField.text = ""
let previousTag = textField.tag - 1
if let previousResponder = textField.superview?.viewWithTag(previousTag) {
previousResponder.becomeFirstResponder()
}
}
if textFieldCount < 1 && string.count > 0 {
setValueAndMoveForward()
if textField.tag == 4 {
print("Do something")
}
return false
} else if textFieldCount >= 1 && string.count == 0 {
clearValueAndMoveBack()
return false
} else if textFieldCount >= 1 && string.count > 0 {
let nextTag = self.tag + 1
if let previousResponder = self.superview?.viewWithTag(nextTag) {
previousResponder.becomeFirstResponder()
if let activeTextField = previousResponder as? UITextField {
activeTextField.text = string
}
}
return false
}
return true
}
}
变体 B（有点另一种行为）：
extension EnterConfirmationCodeTextField: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
guard let textFieldCount = textField.text?.count else { return false }
// Сlosure
let setValueAndMoveForward = {
textField.text = string
let nextTag = textField.tag + 1
if let nextResponder = textField.superview?.viewWithTag(nextTag) {
nextResponder.becomeFirstResponder()
}
}
// Сlosure
let clearValueAndMoveBack = {
textField.text = ""
let previousTag = textField.tag - 1
if let previousResponder = textField.superview?.viewWithTag(previousTag) {
previousResponder.becomeFirstResponder()
}
}
if textFieldCount < 1 && string.count > 0 {
setValueAndMoveForward()
if textField.tag == 4 {
print("Do something")
}
return false
} else if textFieldCount >= 1 && string.count == 0 {
clearValueAndMoveBack()
return false
} else if textFieldCount >= 1 {
setValueAndMoveForward()
return false
}
return true
}
}
另外，我实现了这个功能：
在最后一个textFiled为空的情况下，我只想切换到上一个textFiled。我尝试了所有这些方法。但对我来说，下面的方法更优雅，而且很有魅力：
变体 A
class EnterConfirmationCodeTextField: UITextField {
// MARK: Life cycle
override func awakeFromNib() {
super.awakeFromNib()
delegate = self
}
// MARK: Methods
override func deleteBackward() {
super.deleteBackward()
let previousTag = self.tag - 1
if let previousResponder = self.superview?.viewWithTag(previousTag) {
previousResponder.becomeFirstResponder()
if let activeTextField = previousResponder as? UITextField {
if let isEmpty = activeTextField.text?.isEmpty, !isEmpty {
activeTextField.text = String()
}
}
}
}
}
变体 B（有点另一种行为）：
class EnterConfirmationCodeTextField: UITextField {
// MARK: Life cycle
override func awakeFromNib() {
super.awakeFromNib()
delegate = self
}
// MARK: Methods
override func deleteBackward() {
super.deleteBackward()
let previousTag = self.tag - 1
if let previousResponder = self.superview?.viewWithTag(previousTag) {
previousResponder.becomeFirstResponder()
}
}
}
EnterConfirmationCodeTextField为每个文本字段分配并设置它们适当的tag值。
它可以使用 UITextField 委托和通过按递增顺序（例如 1 - 4）为每个文本字段设置标记来实现，下面是解决问题的委托处理程序。
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// On inputing value to textfield
if (textField.text?.characters.count < 1 && string.characters.count > 0){
let nextTag = textField.tag + 1;
// get next responder
var nextResponder = textField.superview?.viewWithTag(nextTag);
if (nextResponder == nil){
nextResponder = textField.superview?.viewWithTag(1);
}
textField.text = string;
nextResponder?.becomeFirstResponder();
return false;
}
else if (textField.text?.characters.count >= 1 && string.characters.count == 0){
// on deleteing value from Textfield
let previousTag = textField.tag - 1;
// get next responder
var previousResponder = textField.superview?.viewWithTag(previousTag);
if (previousResponder == nil){
previousResponder = textField.superview?.viewWithTag(1);
}
textField.text = "";
previousResponder?.becomeFirstResponder();
return false;
}
return true;
}
迅捷2.3
class BankDepositsWithOTPVC: UIViewController {
let limitLength = 1
override func viewDidLoad() {
super.viewDidLoad()
}
}
// MARK: Textfield Validator
extension BankDepositsWithOTPVC : UITextFieldDelegate {
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// On inputing value to textfield
if (textField.text?.characters.count < 1 && string.characters.count > 0){
let nextTag = textField.tag + 1;
// get next responder
let nextResponder = textField.superview?.viewWithTag(nextTag);
if (nextResponder == nil){
textField.resignFirstResponder()
// nextResponder = textField.superview?.viewWithTag(1);
}
textField.text = string;
nextResponder?.becomeFirstResponder();
return false;
}else if (textField.text?.characters.count >= 1 && string.characters.count > 0){
// maximum 1 digit
textField.text = "";
let nextTag = textField.tag + 1;
// get next responder
let nextResponder = textField.superview?.viewWithTag(nextTag);
if (nextResponder == nil){
textField.resignFirstResponder()
// nextResponder = textField.superview?.viewWithTag(1);
}
textField.text = string;
nextResponder?.becomeFirstResponder();
return false;
}
else if (textField.text?.characters.count >= 1 && string.characters.count == 0){
// on deleteing value from Textfield
let previousTag = textField.tag - 1;
// get next responder
var previousResponder = textField.superview?.viewWithTag(previousTag);
if (previousResponder == nil){
previousResponder = textField.superview?.viewWithTag(1);
}
textField.text = "";
previousResponder?.becomeFirstResponder();
return false;
}
//return true;
guard let text = textField.text else { return true }
let newLength = text.characters.count + string.characters.count - range.length
return newLength <= limitLength
}
}
Objective-C
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if ((textField.text.length < 1) && (string.length > 0))
{
NSInteger nextTag = textField.tag + 1;
UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
if (! nextResponder){
[textField resignFirstResponder];
}
textField.text = string;
if (nextResponder)
[nextResponder becomeFirstResponder];
return NO;
}else if ((textField.text.length >= 1) && (string.length > 0)){
//FOR MAXIMUM 1 TEXT
NSInteger nextTag = textField.tag + 1;
UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
if (! nextResponder){
[textField resignFirstResponder];
}
textField.text = string;
if (nextResponder)
[nextResponder becomeFirstResponder];
return NO;
}
else if ((textField.text.length >= 1) && (string.length == 0)){
// on deleteing value from Textfield
NSInteger prevTag = textField.tag - 1;
// Try to find prev responder
UIResponder* prevResponder = [textField.superview viewWithTag:prevTag];
if (! prevResponder){
[textField resignFirstResponder];
}
textField.text = string;
if (prevResponder)
// Found next responder, so set it.
[prevResponder becomeFirstResponder];
return NO;
}
return YES;
}
修改了Anurag Soni在Swift 3中的回答。
textFields，并且文本字段已设置有序标签它可以防止粘贴多个数字
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// Restrict to only digits
let aSet = NSCharacterSet(charactersIn:"0123456789").inverted
let compSepByCharInSet = string.components(separatedBy: aSet)
let numberFiltered = compSepByCharInSet.joined(separator: "")
if string != numberFiltered {
return false
}
// Get the unwrapped text
guard let text = textField.text else {
return false
}
if (text.characters.count < 1 && string.characters.count == 1) {
// New value to empty text field
textField.text = string
// Next responder
if let someTextField = (textFields.filter { $0.tag == textField.tag + 1 }).first {
someTextField.becomeFirstResponder()
} else {
view.endEditing(true)
}
return false
} else if (text.characters.count >= 1 && string.characters.count == 0){
// On deleting value from Textfield
textField.text = ""
// Previous responder
if let someTextField = (textFields.filter { $0.tag == textField.tag - 1 }).first {
someTextField.becomeFirstResponder()
} else {
view.endEditing(true)
}
return false
} else if string.characters.count == 1 {
// There's already some digit in text field
// Replace it with new one
textField.text = string
// Next responder
if let someTextField = (textFields.filter { $0.tag == textField.tag + 1 }).first {
someTextField.becomeFirstResponder()
} else {
view.endEditing(true)
}
}
return false
}
斯威夫特 4
当您将密码中的数字输入文本字段时，您应该显示一个数字，然后下一个文本字段将成为第一响应者，因此在代码出现在文本视图后更改第一响应者
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
guard let textField = textField as? PinCodeTextField else { return true }
if string == "" {// when the backward clicked, let it go :)
return true
}
// when textfield is not empty, well, next number
if textField.pinCode.count == textField.maxCount {
becomeFirstResponder(after: textField)
return false
}
if string.count > textField.maxCharacterCount {// the max character count should be 1
return false
}
return true
}
// now the text field has been filled with a number
func textFieldCotentDidChange(_ textField: UITextField) {
print("didchange")
guard let textField = textField as? PinCodeTextField else { return }
if textField.pinCode.count == 0 {
becomeFirstResponder(before: textField)
}
// when textfield has been filled, ok! next!
if textField.pinCode.count == textField.maxCharacterCount {
becomeFirstResponder(after: textField)
}
}
有关更多详细信息和简单演示，请参阅此链接
将标签提供给文本字段，如 1,2,3,4 并直接使用它
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
let next:NSInteger
if string == "" {
next = textField.tag - 1;
}
else{
next = textField.tag + 1;
}
if (textField.text?.characters.count)! >= 1 {
if textField.tag == 4 {
if string == "" {
textField.text = ""
let temptf = self.view.viewWithTag(next) as! UITextField
temptf.becomeFirstResponder()
return false
}
else{
if (textField.text?.characters.count)! > 1 {
let stringg = textField.text!
textField.text = stringg.replacingOccurrences(of: stringg, with: string)
}
return false
}
}
else{
if string == "" {
textField.text = ""
if next != 0 {
let temptf = self.view.viewWithTag(next) as! UITextField
temptf.becomeFirstResponder()
}
return false
}
else{
if (textField.text?.characters.count)! > 1 {
let stringg = textField.text!
textField.text = stringg.replacingOccurrences(of: stringg, with: string)
}
let temptf = self.view.viewWithTag(next) as! UITextField
temptf.becomeFirstResponder()
}
}
}
return true
}
试试这个示例教程密码锁
视图控制器.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITextFieldDelegate>
{
IBOutlet UITextField *txtPassword;
}
@end
视图控制器.m
- (void)viewDidLoad
{
[super viewDidLoad];
txtPassword.delegate=self;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return (newLength > 1) ? NO : YES;
}
感谢@Anurag Soni，这是一个替代的 UX 推送到下一个字段并在完成后关闭（上面还有布局逻辑）：
-(UIView *)addSpacedTextInputToView:(UIView *)parent subtitle:(NSString *)subtitle spaces:(int)spaces atOffset:(float)offset{
float parentWidth = parent.frame.size.width;
float tfWidth = 2 * increment;
float tfHeight = 3 * increment;
float startX = 3 * increment;
float remainingWidth = parentWidth - 2 * startX - spaces * tfWidth;
float padding = remainingWidth / (float)(spaces-1);
UIView * holder = [self addViewToView:parent withFrame:CGRectMake(0, offset, parentWidth, 0)];
UIView * tfHolder = [self addViewToView:holder withFrame:CGRectMake(0, 0, parentWidth, tfHeight)];
float localX = startX;
float localY = 0.0f;
for (int n = 0; n < spaces; n++){
UITextField * tf = [UITextField new];
tf.frame = CGRectMake(localX, localY, tfWidth, tfHeight);
tf.textColor = [UIColor whiteColor];
tf.font = headerFont;
tf.textAlignment = NSTextAlignmentCenter;
tf.tintColor = [UIColor whiteColor];
tf.keyboardAppearance = UIKeyboardAppearanceDark;
tf.tag = n;
tf.delegate = self;
[tfHolder addSubview:tf];
UIView * div = [self addViewToView:tf withFrame:CGRectMake(0, tfHeight-2, tfWidth, 1)];
div.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0.5f];
localX += tfWidth;
localX += padding;
}
localY += tfHeight;
localY += increment;
localY += [self addSystemLabelToView:holder colour:nil text:subtitle maxWidth:0 offset:localY].frame.size.height;
holder.frame = CGRectMake(0, offset, parent.frame.size.width, localY);
return holder;
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if (string.length > 0){
textField.text = string.uppercaseString; //optional to uppercase
UIView * div = textField.subviews.firstObject; //change div colour
div.backgroundColor = [UIColor whiteColor];
int nextTag = (int)textField.tag + 1;
UIResponder * nextResponder = [textField.superview viewWithTag:nextTag];
if (!nextResponder){
[textField resignFirstResponder];
}
if (nextResponder){
[nextResponder becomeFirstResponder];
}
}
return false;
}
我正在研究类似的功能，并以我的方式做到了。下面的解决方案。 斯威夫特 4
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
//For clear button pressed
//If the textfield has already text in it
if string.count == 0 {
textField.text = string
return true
}
//For First time entry into the text field
guard let text = textField.text, text.count <= 0 else {
//If user enter second character
return false
}
//For First time entry into the text field
if text.count == 0 {
textField.text = string
textField.resignFirstResponder()
self.nextResponde(tag: textField.tag)
return true
}
return false
}
//To make the next field as responder
func nextResponde(tag: Int) {
switch tag {
case self.PINTextField.tag:
guard let text = self.PINTextField1.text, text.count == 1 else {
self.PINTextField1.becomeFirstResponder()
return
}
case self.PINTextField1.tag:
guard let text = self.PINTextField2.text, text.count == 1 else {
self.PINTextField2.becomeFirstResponder()
return
}
case self.PINTextField2.tag:
guard let text = self.PINTextField3.text, text.count == 1 else {
self.PINTextField3.becomeFirstResponder()
return
}
default:
let _ = tag
}
}
只需使用TextFieldDelegate方法并在每次更改后检查 TextField 的长度
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let newString = (textField.text! as NSString).stringByReplacingCharactersInRange(range, withString: string)
if newString.characters.count == 1
{
nextTextField.becomeFirstResponder()
return true
}
else
{
return false
}
}
试试这个： -对于 swift 3.0
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// On inputing value to textfield
if ((textField.text?.characters.count)! < 1 && string.characters.count > 0){
let nextTag = textField.tag + 1;
// get next responder
let nextResponder = textField.superview?.viewWithTag(nextTag);
textField.text = string;
if (nextResponder == nil){
textField.resignFirstResponder()
}
nextResponder?.becomeFirstResponder();
return false;
}
else if ((textField.text?.characters.count)! >= 1 && string.characters.count == 0){
// on deleting value from Textfield
let previousTag = textField.tag - 1;
// get next responder
var previousResponder = textField.superview?.viewWithTag(previousTag);
if (previousResponder == nil){
previousResponder = textField.superview?.viewWithTag(1);
}
textField.text = "";
previousResponder?.becomeFirstResponder();
return false;
}
return true;
}
在 swift 3.0 中转换了 Anurag Soni 的答案
你只需要实现这个方法。