为什么说是简单版，由于这里只说一个数字键盘。
一，怎样自己设置键盘
随意一个view都可以作为键盘，主要代码是为你的输入框指定inputView，这个inputView就是键盘，键盘具体什么样子都可以。
kfZNumberKeyBoard * mkb = [kfZNumberKeyBoard moneyKeyBoardBuyer]; UITextField * field = [[UITextField alloc]init];field.backgroundColor = [UIColor cyanColor];field.inputView = mkb;[self.view addSubview:field];field.frame = CGRectMake(20, NavBottom + 50, DEF_SCREEN_WIDTH - 40, 40);二，自己设置键盘怎样实现各种输入
这里千万不要自己拼接字符串太容易出问题了，用系统自带的方法。我们发现不论UITextField还是UITextView都遵循UITextInput协议，这个协议又遵循UIKeyInput协议，我们用的就是UIKeyInput协议中的方法。
- (void)insertText:(NSString *)text;//插入文字，不用解决光标位置- (void)deleteBackward;//删除，不用解决光标位置用这两个方法是不是事情就特别简单了，其实说到这里已经可以了，怎样做都说完了。不过我还是推销一下我写的数字键盘吧。最后面我会贴出代码用的可以拷贝改一下。
三，数字键盘
先看效果图：
image.pnga.UI布局上，删除和确定是单独的按键，其余部分我用了collectionView，想着之后做的乱序加密效果好做，打乱数据源刷新一下就行（当然现在没有，不是懒，过渡开发是病）
b.获取当前输入框，这里为了不在外面传，直接在内部监听了输入框开始输入和结束输入。
c.加了几个输入限制：
1.有小数点不能在输入小数点
2.内容为空输入小数点时，前面自动补0
3.最大小数位数限制(测试不多可能有bug哦)
4.移除焦点时小数点前面没东西自动补0
5.输入框有内容确定可以点击，输入框没内容确定不能点击。
下面是代码了：
@interface kfZNumberKeyBoard : UIView/** 确认按键 */@property (nonatomic, strong) UIButton * returnButton;/** 有没有小数点 */@property (nonatomic, assign) BOOL hiddenPoint;/** 小数位数，为0不限制，不需要小数时请使用hiddenPoint隐藏点 默认是2 */@property (nonatomic, assign) NSUInteger decimalCount;/** 整体高度 */@property (nonatomic, assign, readonly) CGFloat KFZNumberKeyBoardHeight;+(instancetype)moneyKeyBoardBuyer;+(instancetype)moneyKeyBoardSeller;-(instancetype)initWitHiddenPoint:(BOOL)hiddenPoint;@end#import "kfZNumberKeyBoard.h"#import "KFZKeyBoardCell.h"@interface kfZNumberKeyBoard ()<UICollectionViewDataSource, UICollectionViewDelegate>@property(nonatomic, weak) UIView<UITextInput> * textInputView;/** 删除按键 */@property (nonatomic, strong) UIButton * deleteButton;@property (nonatomic, strong) UICollectionView *collectionView;@property (nonatomic, strong) NSArray<NSNumber*> *dataSource;/** 间隔 */@property (nonatomic, assign) CGFloat KFZNumberKeyBoardSpace;/** 数字按键高度 */@property (nonatomic, assign) CGFloat KFZNumberKeyBoardItemHeight;@end@implementation kfZNumberKeyBoard+(instancetype)moneyKeyBoardBuyer{ kfZNumberKeyBoard * keyBoard = [[kfZNumberKeyBoard alloc]initWitHiddenPoint:NO]; return keyBoard;}+(instancetype)moneyKeyBoardSeller{ kfZNumberKeyBoard * keyBoard = [[kfZNumberKeyBoard alloc]initWitHiddenPoint:NO]; keyBoard.returnButton.backgroundColor = [UIColor maintonal_sellerMain]; return keyBoard;} -(instancetype)initWitHiddenPoint:(BOOL)hiddenPoint{ self = [super init]; if (self) { _hiddenPoint = hiddenPoint; _KFZNumberKeyBoardItemHeight = 50.f; _KFZNumberKeyBoardSpace = 0.5; _KFZNumberKeyBoardHeight = _KFZNumberKeyBoardItemHeight * 4 + _KFZNumberKeyBoardSpace * 5 + HOMEINDICATOR_HEIGHT; _decimalCount = 2; self.frame = CGRectMake(0, 0, DEF_SCREEN_WIDTH, _KFZNumberKeyBoardHeight); _deleteButton = [[UIButton alloc]init]; _deleteButton.backgroundColor = [UIColor color_FAFAFA]; [_deleteButton setImage:[UIImage imageNamed:@"keyboard_icon_backspace"] forState:UIControlStateNormal]; [_deleteButton addTarget:self action:@selector(deleteEvent) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:_deleteButton]; [_deleteButton mas_makeConstraints:^(MASConstraintMaker *make) { make.top.mas_equalTo(_KFZNumberKeyBoardSpace); make.right.mas_equalTo(0.f); make.width.equalTo(self).multipliedBy(0.25); }]; _returnButton = [[UIButton alloc]init]; [_returnButton setTitle:@"确定" forState:UIControlStateNormal]; [_returnButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; _returnButton.titleLabel.font = [UIFont custemFontOfSize:20 weight:UIFontWeightRegular]; _returnButton.backgroundColor = [UIColor mainTonal_main]; [_returnButton addTarget:self action:@selector(returnEvent) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:_returnButton]; [_returnButton mas_makeConstraints:^(MASConstraintMaker *make) { make.top.equalTo(_deleteButton.mas_bottom); make.right.equalTo(_deleteButton); make.bottom.mas_equalTo(-HOMEINDICATOR_HEIGHT); make.height.equalTo(_deleteButton); make.width.equalTo(_deleteButton).offset(_KFZNumberKeyBoardSpace); }]; //101对应小数点 102对应收起键盘 修改的话其余的判断逻辑也要修改 _dataSource = @[@(1), @(2), @(3), @(4), @(5), @(6), @(7), @(8), @(9), @(101), @(0), @(102)]; UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc]init]; layout.itemSize = CGSizeMake((DEF_SCREEN_WIDTH * 3.f/4.f - _KFZNumberKeyBoardSpace*3)/3.f, (_KFZNumberKeyBoardHeight - HOMEINDICATOR_HEIGHT - _KFZNumberKeyBoardSpace*5)/4.f); layout.sectionInset = UIEdgeInsetsMake(_KFZNumberKeyBoardSpace, 0, _KFZNumberKeyBoardSpace, _KFZNumberKeyBoardSpace); layout.minimumLineSpacing = _KFZNumberKeyBoardSpace; layout.minimumInteritemSpacing = _KFZNumberKeyBoardSpace; _collectionView = [[UICollectionView alloc]initWithFrame:CGRectZero collectionViewLayout:layout]; _collectionView.dataSource = self; _collectionView.delegate = self; [_collectionView registerClass:[KFZKeyBoardCell class] forCellWithReuseIdentifier:NSStringFromClass([KFZKeyBoardCell class])]; _collectionView.backgroundColor = [UIColor clearColor]; _collectionView.scrollEnabled = NO; [self addSubview:_collectionView]; [_collectionView mas_makeConstraints:^(MASConstraintMaker *make) { make.top.left.mas_equalTo(0.f); make.bottom.mas_equalTo(-HOMEINDICATOR_HEIGHT); make.right.equalTo(_deleteButton.mas_left); }]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textInputViewDidBeginEditing:) name:UITextFieldTextDidBeginEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textInputViewDidEndEditing:) name:UITextFieldTextDidEndEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textInputViewDidBeginEditing:) name:UITextViewTextDidBeginEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textInputViewDidEndEditing:) name:UITextViewTextDidEndEditingNotification object:nil]; } return self;}-(void)dealloc{ [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidBeginEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidEndEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidBeginEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidEndEditingNotification object:nil];}#pragma mark - response-(void)textInputWithNumber:(NSNumber *)number{ NSString *strValue = [self inputViewString]; if ([number isEqualToNumber:@(101)]) { if ([strValue containsString:@"."]){ return; }else{ if ([strValue length] <= 0) [self.textInputView insertText:@"0."]; else [self.textInputView insertText:@"."]; } }else{ if ([strValue containsString:@"."] && _decimalCount > 0) { NSInteger pointLocation = [strValue rangeOfString:@"."].location; NSInteger curDecimalCount = strValue.length - pointLocation - 1; if (curDecimalCount >= _decimalCount) { NSInteger cursorLocation = [self inputViewSelectRangeLocation]; if (cursorLocation <= pointLocation) { [_textInputView insertText:number.stringValue]; } }else{ [_textInputView insertText:number.stringValue]; } }else{ [_textInputView insertText:number.stringValue]; } } [self freshReturnButtonEnabled];}-(void)deleteEvent{ [_textInputView deleteBackward]; [self freshReturnButtonEnabled];}-(void)returnEvent{ [_textInputView resignFirstResponder];}-(void)textInputViewDidBeginEditing:(NSNotification*)notification{ _textInputView = notification.object; [self freshReturnButtonEnabled];}-(void)textInputViewDidEndEditing:(NSNotification*)notification{ NSString *strValue = [self inputViewString]; if ([strValue startsWithString:@"."]) { strValue = [NSString stringWithFormat:@"0%@", strValue]; [self setInputViewString:strValue]; } _textInputView = nil;}-(NSString *)inputViewString{ NSString *strValue = @""; if ([self.textInputView isKindOfClass:[UITextView class]]){ strValue = ((UITextView *)self.textInputView).text; }else if ([self.textInputView isKindOfClass:[UITextField class]]){ strValue = ((UITextField *)self.textInputView).text; } return strValue;}-(void)setInputViewString:(NSString *)string{ if ([self.textInputView isKindOfClass:[UITextView class]]){ ((UITextView *)self.textInputView).text = string; }else if ([self.textInputView isKindOfClass:[UITextField class]]){ ((UITextField *)self.textInputView).text = string; }}-(NSInteger)inputViewSelectRangeLocation{ NSInteger location = 0; if ([self.textInputView isKindOfClass:[UITextView class]]){ UITextView * textView = (UITextView *)self.textInputView; location = textView.selectedRange.location; }else if ([self.textInputView isKindOfClass:[UITextField class]]){ UITextField *textField = (UITextField *)self.textInputView; UITextPosition* beginning = textField.beginningOfDocument; UITextRange* selectedRange = textField.selectedTextRange; UITextPosition* selectionStart = selectedRange.start; location = [textField offsetFromPosition:beginning toPosition:selectionStart]; } return location;}-(void)freshReturnButtonEnabled{ NSString *strValue = [self inputViewString]; if (strValue.length == 0) { _returnButton.enabled = NO; _returnButton.alpha = 0.6; }else{ _returnButton.enabled = YES; _returnButton.alpha = 1.f; }}#pragma mark -- Delegate#pragma mark - UICollectionViewDataSource- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ return self.dataSource.count;}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ KFZKeyBoardCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([KFZKeyBoardCell class]) forIndexPath:indexPath]; NSNumber * number = self.dataSource[indexPath.row]; if ([number isEqualToNumber:@(101)] && _hiddenPoint) { cell.textLabel.text = @""; }else{ cell.textNumber = number; } return cell;}#pragma mark - UICollectionViewDelegate- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ NSNumber * number = self.dataSource[indexPath.row]; if ([number isEqualToNumber:@(102)]) { [_textInputView resignFirstResponder]; return; } if ([number isEqualToNumber:@(101)] && _hiddenPoint) { return; } [self textInputWithNumber:number];}#pragma mark - init-(void)setHiddenPoint:(BOOL)hiddenPoint{ _hiddenPoint = hiddenPoint; [_collectionView reloadData];}@end这个是里面cell的：
@interface KFZKeyBoardCell : UICollectionViewCell/** 文字 */@property (nonatomic, strong) UILabel * textLabel;/** 图片 */@property (nonatomic, strong) UIImageView * imageIcon;/** 设置值 */@property (nonatomic, strong) NSNumber * textNumber;@end#import "KFZKeyBoardCell.h"@implementation KFZKeyBoardCell- (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor color_FAFAFA]; [self.contentView addSubview:self.textLabel]; [self.textLabel mas_makeConstraints:^(MASConstraintMaker *make) { make.top.bottom.left.right.mas_equalTo(0.f); }]; self.imageIcon.hidden = YES; [self.contentView addSubview:self.imageIcon]; [self.imageIcon mas_makeConstraints:^(MASConstraintMaker *make) { make.center.mas_equalTo(CGPointZero); make.size.mas_equalTo(CGSizeMake(24.f, 22.f)); }]; } return self;}-(void)prepareForReuse{ self.textLabel.hidden = NO; self.imageIcon.hidden = YES;}- (void)setTextNumber:(NSNumber *)textNumber{ _textNumber = textNumber; if ([textNumber isEqualToNumber:@(101)]) { self.textLabel.text = @"·"; } else if ([textNumber isEqualToNumber:@(102)]){ self.textLabel.hidden = YES; self.imageIcon.hidden = NO; self.imageIcon.image = [UIImage imageNamed:@"keyboard_icon_smallkb"]; } else{ self.textLabel.text = textNumber.stringValue; }}- (UILabel *)textLabel{ if (!_textLabel) { _textLabel = [[UILabel alloc]init]; _textLabel.font = [UIFont KFZSpecial_DINAlternateBoldWithFontSize:24.f]; _textLabel.textAlignment = NSTextAlignmentCenter; _textLabel.userInteractionEnabled = NO; _textLabel.backgroundColor = UIColor.clearColor; } return _textLabel;}-(UIImageView *)imageIcon{ if (!_imageIcon) { _imageIcon = [[UIImageView alloc]init]; } return _imageIcon;}@end