简单注册界面代理实现

// 工具条
// HMKeyboardTool.h
#import 

typedef enum {
    KeyboardItemTypePrevious,//上一个
    KeyboardItemTypeNext,//下一个
    KeyboardItemTypeDone//完成
}KeyboardItemType;

@class HMKeyboardTool;

@protocol HMKeyboardToolDelegate 

-(void)keyboardTool:(HMKeyboardTool *)keyboardTool didClickItemType:(KeyboardItemType)itemType;

@end

@interface HMKeyboardTool : UIView

//添加代理
@property(nonatomic,weak)id delgate;

+ (instancetype)keyboardTool;

@end

// HMKeyboardTool.m
#import "HMKeyboardTool.h"

@interface HMKeyboardTool()

- (IBAction)previous:(id)sender;
- (IBAction)next:(id)sender;
- (IBAction)done:(id)sender;

@end

@implementation HMKeyboardTool

+ (instancetype)keyboardTool{
    return [[[NSBundle mainBundle] loadNibNamed:@"HMKeyboardTool" owner:nil options:nil] lastObject];
}

//上一个
- (IBAction)previous:(id)sender {

    //判断代理有没有实现相应的方法
    if ([self.delgate respondsToSelector:@selector(keyboardTool:didClickItemType:)]) {
        [self.delgate keyboardTool:self didClickItemType:KeyboardItemTypePrevious];
    }
}

//下一个
- (IBAction)next:(id)sender {
    //判断代理有没有实现相应的方法
    if ([self.delgate respondsToSelector:@selector(keyboardTool:didClickItemType:)]) {
        [self.delgate keyboardTool:self didClickItemType:KeyboardItemTypeNext];
    }

}
//完成
- (IBAction)done:(id)sender {

    //判断代理有没有实现相应的方法
    if ([self.delgate respondsToSelector:@selector(keyboardTool:didClickItemType:)]) {
        [self.delgate keyboardTool:self didClickItemType:KeyboardItemTypeDone];
    }
}
@end

HMKeyboardTool.xib图:

// HMViewController.h
#import 

@interface HMViewController : UIViewController

@end

// HMViewController.m
#import "HMViewController.h"
#import "HMKeyboardTool.h"

@interface HMViewController (){

    NSArray *_fields;//存储所有的textField
}
@property (weak, nonatomic) IBOutlet UITextField *birthdayField;
@property (weak, nonatomic) IBOutlet UIView *inputContainer;//输入框容器view

@end

@implementation HMViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //1.初始化自定议键盘
    [self setupCustomKeyboard];

    //2.设置每一个textfield的键盘工具view（inputAccessoryView）
    [self setupKeyboardTool];

    //3.监听键盘的事件
    [self setupKeyoardNotification];
}


//1.初始化自定议键盘
-(void)setupCustomKeyboard{
    UIDatePicker *datePicker = [[UIDatePicker alloc] init];
    datePicker.locale = [NSLocale localeWithLocaleIdentifier:@"zh"];
    datePicker.datePickerMode = UIDatePickerModeDate;
    self.birthdayField.inputView = datePicker;
}

//设置每一个textfield的键盘工具view（inputAccessoryView）
-(void)setupKeyboardTool{

    //创建工具栏
    HMKeyboardTool *tool = [HMKeyboardTool keyboardTool];
    //设置代理
    tool.delgate = self;
    //1.获取输入框窗口所有子控件
    NSArray *views = self.inputContainer.subviews;
    //创建一个数据存储textfield
    NSMutableArray *fieldsM = [NSMutableArray array];
    //2.遍历
    for (UIView *child in views) {
        //如果子控制是UITextField的时候，设置inputAccessoryView
        if ([child isKindOfClass:[UITextField class]]) {
            UITextField *tf = (UITextField *)child;
            tf.inputAccessoryView = tool;
            //把textfield添加到数组
            [fieldsM addObject:tf];
        }
    }
    _fields = fieldsM;
}


-(void)dealloc{
    // 删除在控制器上的通知
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

//3.监听键盘的事件
-(void)setupKeyoardNotification{
    [[NSNotificationCenter  defaultCenter] addObserver:self selector:@selector(kbFrameChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}

//键盘的frame的变化
-(void)kbFrameChange:(NSNotification *)nofifi{
    //NSLog(@"%@",nofifi);

    //获取键盘改变化的y值
    //这键盘结束时的frm
    CGRect kbEndFrm =[nofifi.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    //键盘结束时的y
    CGFloat kbEndY = kbEndFrm.origin.y;

    //获取当前的响应者
    int currentIndex = [self getCurrentResponderIndex];
    UITextField *currentTf = _fields[currentIndex];
    CGFloat tfMaxY = CGRectGetMaxY(currentTf.frame) + self.inputContainer.frame.origin.y;

    //如果textfield的最大值在于键盘的y坐，才要往上移
    if (tfMaxY > kbEndY) {
        [UIView animateWithDuration:0.25 animations:^{
            self.view.transform = CGAffineTransformMakeTranslation(0, kbEndY - tfMaxY);
        }];
    }else{
        [UIView animateWithDuration:0.25 animations:^{
            self.view.transform = CGAffineTransformIdentity;
        }];
    }
}

#pragma mark 键盘工具条的代理
-(void)keyboardTool:(HMKeyboardTool *)keyboardTool didClickItemType:(KeyboardItemType)itemType{
    //获取当前的响应者的索引
    int currentIndex = [self getCurrentResponderIndex];
    NSLog(@"当前的响应者 %d",currentIndex);

    if (itemType == KeyboardItemTypePrevious) {
        // 让上一个field成功响应者
        [self showProviousField:currentIndex];
    }else if(itemType == KeyboardItemTypeNext){
        // 让下一个field成功响应者
        [self showNextField:currentIndex];
    }else{
        [self touchesBegan:nil withEvent:nil];
    }
}

// 获取当前textfield的响应者索引
// 如果返回-1代理没有找响应者
-(int)getCurrentResponderIndex{
    //遍历所有的textfield获取响应者
    for (UITextField *tf in _fields) {
        if (tf.isFirstResponder) {
           return [_fields indexOfObject:tf];
        }
    }
    return -1;
}


//让上一个field成功响应者
-(void)showProviousField:(int)currentIndex{
    int proviousIndex =  currentIndex - 1;
    if (proviousIndex > 0  ) {
        UITextField *proviousTf = [_fields objectAtIndex:proviousIndex];
        [proviousTf becomeFirstResponder];
    }
}

//让下一个field成功响应者
-(void)showNextField:(int)currentIndex{
    int nextIndex =  currentIndex + 1;
    //下一个索引不能超过_fields数组的个数
    if (nextIndex < _fields.count) {
        //让当前响应者分发去
        UITextField *currentTf = [_fields objectAtIndex:currentIndex];
        [currentTf resignFirstResponder];

        UITextField *nextTf = [_fields objectAtIndex:nextIndex];
        [nextTf becomeFirstResponder];
    }

}


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.view endEditing:YES];

    [UIView animateWithDuration:0.25 animations:^{
        self.view.transform = CGAffineTransformIdentity;
    }];
}
@end

效果图片: