多个相似的控件之间的便利与字符的拼接

形如这样的输入会员卡卡好的，要求输入的数字一一对应

1、 要定义的变量

/// 临时变量
@property(nonatomic , strong)UITextField * tempFiled;

/// 标记
@property (nonatomic ,assign) int  tempTag;

/// 存储文本框
@property (nonatomic, strong) NSMutableArray *textFieldArrayM;

/// 临时文字是数组
@property (nonatomic, copy) NSMutableArray *numberArrayM;

/// 文本框的标记
@property (nonatomic, assign) NSInteger numInField;

/// 输入的卡号
@property (nonatomic, strong) NSString * cardNumber;

-(NSMutableArray *)numberArrayM
{
    if (!_numberArrayM) {
        _numberArrayM = [NSMutableArray arrayWithObjects:@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",nil];
    }
    return _numberArrayM;
}

-(NSMutableArray *)textFieldArrayM
{
    if(!_textFieldArrayM)
    {
        _textFieldArrayM = [NSMutableArray array];
    }
    return _textFieldArrayM;
}

 2、添加视图

// 标题
    UILabel * topView = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.bgScrollView.width, kHeightOfTextField)];
    topView.backgroundColor = [UIColor colorWithRed:(157 / 255.0) green:( 157 / 255.0) blue:( 157 / 255.0) alpha:1.0];
    topView.textColor = [UIColor whiteColor];
    topView.textAlignment = NSTextAlignmentLeft;
    topView.text = @"   请输入您的会员卡号";
    topView.font = [UIFont systemFontOfSize:16];
    [self.bgScrollView addSubview:topView];
    
    UIImageView * cardNumImage = [[UIImageView alloc]initWithFrame:CGRectMake(kSpace, topView.bottom + kSpace, self.bgScrollView.width- (2*kSpace), kHeightOfTextField)];
    cardNumImage.image = [UIImage imageNamed:@"kahaobang"];
    cardNumImage.userInteractionEnabled = YES;
    [self.bgScrollView addSubview:cardNumImage];
    
    // 输入框
    for (int i = 0; i < kTextFiledNumber ; i ++) {
        
        CGFloat textFiledW = (self.bgScrollView.width- (2*kSpace))/10;
        UITextField * cardNumTextFiled = [[UITextField alloc]initWithFrame:CGRectMake(kSpace+(i * textFiledW), topView.bottom + kSpace, textFiledW, kHeightOfTextField)];
        cardNumTextFiled.borderStyle = UITextBorderStyleNone;
        cardNumTextFiled.textAlignment = NSTextAlignmentCenter;
        cardNumTextFiled.keyboardType =  UIKeyboardTypeNumberPad;
        cardNumTextFiled.delegate = self;
        cardNumTextFiled.tag = i;
          [self.textFieldArrayM addObject:cardNumTextFiled];
        [self.bgScrollView addSubview:cardNumTextFiled];
    }
   /// 第一响应者
    [[self.textFieldArrayM firstObject]becomeFirstResponder];

        // 确定按钮
    UIButton * sureButton = [UIButton buttonWithType:UIButtonTypeCustom];
    sureButton.frame = CGRectMake(kSpace, cardNumImage.bottom + (3*kSpace), self.bgScrollView.width - (2*kSpace), kHeightOfTextField);
    [sureButton setBackgroundImage:[UIImage imageNamed:@"log_red_bg"] forState:UIControlStateNormal];
    [sureButton setTitle:@"确定" forState:UIControlStateNormal];
    [sureButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    sureButton.titleLabel.font = [UIFont systemFontOfSize:16];
    [self.bgScrollView addSubview:sureButton];
    [sureButton addTarget:self action:@selector(sureClicked) forControlEvents:UIControlEventTouchUpInside];

/**
 * @brief 点击确定按钮
 */

-(void)sureClicked
{
    if(self.numInField < kTextFiledNumber)
    {
        [[DMCAlertCenter defaultCenter] postAlertWithMessage:@"请输入完整..."];
        for (UITextField *textField in self.textFieldArrayM)
        {
            if([textField.text isEqualToString:@""])
            {
                [textField becomeFirstResponder];
                break;
            }
        }
    }
    else
    {
        NSMutableString *appendString = [NSMutableString string];
        for (NSString *string in self.numberArrayM) {
            [appendString appendString:string];
        }
        [[DMCAlertCenter defaultCenter] postAlertWithMessage:appendString];

    }
   
}

#pragma 代理方法
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    if (self.tempFiled == nil){
       [textField becomeFirstResponder];
        self.tempFiled = textField;
    }
    else if (self.tempFiled !=nil && self.tempFiled == textField){
        [self.tempFiled becomeFirstResponder];
        
    }
    else if (self.tempFiled!= textField && self.tempFiled!=nil){
        [textField becomeFirstResponder];
        self.tempFiled = textField;
    }
}


/**
 * @brief 文字改变，文本长度大于1就会自动跳转到下一个
 */

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *allString = [textField.text stringByAppendingString:string];
    if(allString.length > 1)
    {
        textField.text = [allString substringToIndex:1];
        return NO;
    }
    if(![string isEqualToString:@""])
    {
        self.numInField++;
        [self.numberArrayM replaceObjectAtIndex:textField.tag withObject:string];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            if(textField.tag < kTextFiledNumber)
            {
                for (UITextField *textField in self.textFieldArrayM) {
                    if([textField.text isEqualToString:@""])
                    {
                        [textField becomeFirstResponder];
                        break;
                    }
                }
            }
            if (self.numInField == kTextFiledNumber) {
                [self.view endEditing:YES];
            }
        });
    }else
    {
        self.numInField--;
         [self.numberArrayM replaceObjectAtIndex:textField.tag withObject:@""];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            if(textField.tag < kTextFiledNumber)
                [self.textFieldArrayM[textField.tag] becomeFirstResponder];
        });
    }
    
    return YES;
}