当UITextFiled和UITextView这种文本输入类控件成为第一响应者时，弹出的键盘由他们的一个UIView类的inputView属性来控制，当inputView为nil时会弹出系统的键盘，想要弹出自定义的键盘，将我们自定义的UIView对象给inputView属性赋值即可。表情键盘重点在于排列各个表情和删除键，以及表情键盘上的各种回调设置；
下面为键盘预览图，兼容了竖屏各版本适配，横屏没有兼顾。横屏适配参见这篇博客iOS之自定义表情键盘
图1为6的常用表情，图2为6的全部表情，图3为5的全部表情，表情个数统一为7列3排，根据屏幕不同修改间距以及键盘高度；
下面为项目结构图：采用MVC模式，View层提供表情键盘以及自定义的UITextView。Model层提供表情数据。我为了简单就直接把聊天工具栏通过storyboard拖到了VC上，这里应该再封装一个toolView的；
1、首先来弄好数据层FaceManager，具有一个单例方法、声明了三个数组属性来存放不同的表情；表情图片由Face文件夹来提供；
AllFaces通过我一个名为“emoticons”的plist文件来获取，里面存放的是一个个表情字典，对应着Face中的图片名和图片文字描述；
RecentlyFaces是最近使用过的图片，从本地获取；BigFaces是用来扩展其他大型以及动态效果表情的，没有实现
1 @interface FacesManager : NSObject 2 3 @property (nonatomic, strong, readonly)NSArray * RecentlyFaces; 4 @property (nonatomic, strong, readonly)NSArray * AllFaces; 5 @property (nonatomic, strong, readonly)NSArray * BigFaces; 6 7 + (instancetype)share; 8 - (void)fetchRecentlyFaces; 9 @end10 11 #import "FacesManager.h"12 13 @implementation FacesManager14 15 +(instancetype)share16 {17 static FacesManager * m = nil;18 static dispatch_once_t onceToken;19 dispatch_once(&onceToken, ^{20 m = [[FacesManager alloc] init];21 });22 return m ;23 }24 25 - (instancetype)init26 {27 self = [super init];28 if (self) {29 [self fetchAllFaces];30 [self fetchBigFaces];31 }32 return self;33 }34 35 - (void)fetchAllFaces36 {37 NSString * path = [[NSBundle mainBundle] pathForResource:@"emoticons" ofType:@"plist"];38 NSArray * arrFace = [NSArray arrayWithContentsOfFile:path];39 _AllFaces = arrFace;40 }41 42 - (void)fetchRecentlyFaces43 {44 NSUserDefaults * defauls = [NSUserDefaults standardUserDefaults];45 NSArray * arrFace = [defauls objectForKey:@"RecentlyFaces"];46 _RecentlyFaces = arrFace;47 }48 49 - (void)fetchBigFaces50 {51 52 }53 54 @end View Code 2、数据层弄好后，实现关键的FaceKeyBoardView；首先在这个view上我们需要向外发送：点击每个表情、发送键、删除键的事件，所以需要提供三个向外的回调接口：点击表情的回调、点击删除的回调、点击发送的回调；然后再分析视图结构，首先view上部贴了一个ScrollView用来滑动显示每一页表情、一个稍微靠下的的pageController用于显示当前页数、以及底部的toolBar；
FaceKeyBoardView.h
define了几个需要用到的参数。设置了三个回调接口；
1 #import <UIKit/UIKit.h> 2 #define GrayColor [UIColor colorWithRed:231 / 255.0 green:231 / 255.0 blue:231 / 255.0 alpha:1] 3 #define ScreenWidth [UIScreen mainScreen].bounds.size.width 4 #define ScreenHeight [UIScreen mainScreen].bounds.size.height 5 #define ToolBarHeight 40 6 7 typedef void (^FaceKeyBoardBlock)(NSString * faceName,NSInteger faceTag); 8 typedef void (^FaceKeyBoardSendBlock)(void); 9 typedef void (^FaceKeyBoardDeleteBlock)(void);10 11 @interface FaceKeyBoardView : UIView12 13 - (void)setFaceKeyBoardBlock:(FaceKeyBoardBlock)block;14 - (void)setFaceKeyBoardSendBlock:(FaceKeyBoardSendBlock)block;15 - (void)setFaceKeyBoardDeleteBlock:(FaceKeyBoardDeleteBlock)block;16 @endView Code
FaceKeyBoardView.m：
用到的属性：
1 @interface FaceKeyBoardView ()<UIScrollViewDelegate> 2 3 { 4 CGFloat _FKBViewH; 5 } 6 7 @property (nonatomic, strong)NSArray * arrFace; 8 @property (nonatomic, strong)UIScrollView * scFace; 9 @property (nonatomic, strong)FaceKeyBoardBlock block;10 @property (nonatomic, strong)FaceKeyBoardSendBlock sendBlock;11 @property (nonatomic, strong)FaceKeyBoardDeleteBlock deleteBlock;12 @property (nonatomic, strong)UIToolbar * toolBar;13 @property (nonatomic, strong)UIPageControl * pageC;14 15 @property (nonatomic, strong)FacesManager * FManager;16 17 @end View Code a、首先来重写view的init方法，在这里面设定好view的frame以及设定view的子控件。由于屏幕尺寸不同，所以表情竖直方向间距不同，就会影响到表情键盘的高度，所以frame是动态计算出来的；然后再loadview方法中初始化facemanager用来提供数据，以及获得全部表情和设置toolBar；
1 - (instancetype)init 2 { 3 self = [super init]; 4 if (self) { 5 [self setViewFrame]; 6 [self loadKeyBoardView]; 7 } 8 return self; 9 }10 11 - (void)setViewFrame12 {13 CGFloat marginY = (ScreenWidth - 7 * 30) / (7 + 1);14 CGFloat scViewH = 3 * (30 + marginY) + marginY*2 + 10;15 _FKBViewH = scViewH + ToolBarHeight;16 self.frame = CGRectMake(0, ScreenHeight - _FKBViewH, ScreenWidth, _FKBViewH);17 }18 19 - (void)loadKeyBoardView20 {21 //初始化manager22 self.FManager = [FacesManager share];23 //获取数据24 [self fetchAllFaces];25 //设置toolBar26 [self setToolBar];27 } View Code b、设置了三个方法来获取不同的表情数据用于显示不同的表情键盘；第一次时默认执行fetchAllFaces； 1 - (void)fetchRecentlyFaces 2 { 3 //更新manager 4 [self.FManager fetchRecentlyFaces]; 5 self.arrFace = self.FManager.RecentlyFaces; 6 [self setFaceFrame]; 7 } 8 9 - (void)fetchAllFaces10 {11 self.arrFace = self.FManager.AllFaces;12 //设置表情scrollView13 [self setFaceFrame];14 }15 16 - (void)fetchBigFaces17 {18 self.arrFace = nil;19 [self setFaceFrame];20 } View Code c、在setFaceFrame方法中设置scrollView以及pageController；我通过表情数量来循环设置每个表情按钮的位置，固定了7列三行，根据屏幕设置不同的间距，在每一页的右下角设置删除按钮。根据页数来设置scrollView的内容宽度以及pageController的页数；
1 - (void)setFaceFrame 2 { 3 //列数 4 NSInteger colFaces = 7; 5 //行数 6 NSInteger rowFaces = 3; 7 //设置face按钮frame 8 CGFloat FaceW = 30; 9 CGFloat FaceH = 30;10 CGFloat marginX = (ScreenWidth - colFaces * FaceW) / (colFaces + 1);11 CGFloat marginY = marginX;12 NSLog(@"%lf",marginX);13 14 //表情数量15 NSInteger FaceCount = self.arrFace.count;16 //每页表情数和scrollView页数；17 NSInteger PageFaceCount = colFaces * rowFaces ;18 NSInteger SCPages = FaceCount / PageFaceCount + 1;19 20 CGFloat scViewH = rowFaces * (FaceH + marginY) + marginY*2 + 10;21 //初始化scrollView22 self.scFace = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, scViewH)];23 self.scFace.contentSize = CGSizeMake(ScreenWidth * SCPages, scViewH);24 self.scFace.pagingEnabled = YES;25 self.scFace.bounces = NO;26 self.scFace.delegate = self;27 [self addSubview:self.scFace];28 //初始化贴在sc上的view29 UIView * BtnView = [[UIView alloc] init];30 BtnView.frame = CGRectMake(0, 0, ScreenWidth * SCPages, scViewH);31 [BtnView setBackgroundColor:GrayColor];32 [self.scFace addSubview:BtnView];33 34 for (NSInteger i = 0; i < FaceCount + SCPages; i ++)35 {36 //当前页数37 NSInteger currentPage = i / PageFaceCount;38 //当前行39 NSInteger rowIndex = i / colFaces - (currentPage * rowFaces);40 //当前列41 NSInteger colIndex = i % colFaces;42 43 //viewW * currentPage换页44 CGFloat btnX = marginX + colIndex * (FaceW + marginX) + ScreenWidth * currentPage;45 CGFloat btnY = rowIndex * (marginY + FaceH) + marginY;46 if ((i - (currentPage + 1) * (PageFaceCount - 1) == currentPage || i == FaceCount + SCPages - 1) && self.arrFace)47 {48 //创建删除按钮49 CGFloat btnDelteX = (currentPage + 1) * ScreenWidth - (marginX + FaceW);50 CGFloat btnDelteY = 2 * (FaceH + marginY) +marginY;51 52 UIButton * btnDelte = [UIButton buttonWithType:UIButtonTypeSystem];53 btnDelte.frame = CGRectMake(btnDelteX, btnDelteY, FaceW, FaceH);54 [btnDelte setBackgroundImage:[UIImage imageNamed:@"icon_delete-2"] forState:UIControlStateNormal];55 [btnDelte setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];56 btnDelte.titleLabel.font = [UIFont boldSystemFontOfSize:15];57 58 [btnDelte addTarget:self action:@selector(tapDeleteBtn) forControlEvents:UIControlEventTouchUpInside];59 60 [BtnView addSubview:btnDelte];61 }62 else63 {64 //创建face按钮65 UIButton * btn = [[UIButton alloc] init];66 btn.frame = CGRectMake(btnX , btnY, FaceW, FaceH);67 //tga68 btn.tag = i - currentPage;69 //按钮回调；70 [btn addTarget:self action:@selector(tapFaceBtnWithButton:) forControlEvents:UIControlEventTouchUpInside];71 NSString * strIMG = self.arrFace[i - currentPage][@"png"];72 [btn setImage:[UIImage imageNamed:strIMG] forState:UIControlStateNormal];73 [BtnView addSubview:btn];74 }75 }76 77 //创建pageController78 CGFloat pageH = 10;79 CGFloat pageW = ScreenWidth;80 CGFloat pageX = 0;81 CGFloat pageY = scViewH - pageH - marginY;82 self.pageC = [[UIPageControl alloc] initWithFrame:CGRectMake(pageX, pageY, pageW, pageH)];83 self.pageC.numberOfPages = SCPages;84 self.pageC.currentPage = 0;85 self.pageC.pageIndicatorTintColor = [UIColor lightGrayColor];86 self.pageC.currentPageIndicatorTintColor = [UIColor grayColor];87 [self addSubview:self.pageC];88 } View Code b、还需要把c中的各种点击事件和scrollView的代理事件实现
点击表情的事件中我执行了2个操作：1、将点击的表情存到本地常用表情数组中，逻辑为，如果数组中已有这个表情，就将此表情移到最前面，没有就将表情插入到数组第一位。这里我想着数据量不是很大就使用了Preference来存放本地；2、将表情的文字描述和表情按钮的tga通过block传出去；
当scrollView翻动时，让pageController的当前页数跟着变化；点击删除发送回调；
1 //点击表情 2 - (void)tapFaceBtnWithButton:(UIButton *)button 3 { 4 //将表情存储为常用表情 5 NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults]; 6 NSMutableArray * arrFaces = (NSMutableArray *)[defaults objectForKey:@"RecentlyFaces"]; 7 8 if (!arrFaces) 9 {10 arrFaces = [NSMutableArray array];11 NSDictionary * dicFace = @{@"png":self.arrFace[button.tag][@"png"],@"faceTag":@(button.tag),@"chs":self.arrFace[button.tag][@"chs"]};12 [arrFaces addObject:dicFace];13 [defaults setObject:arrFaces forKey:@"RecentlyFaces"];14 [defaults synchronize];15 }16 //NSLog(@"%p",arrFaces);17 else18 {19 //需要新建一个可变数组，不然修改数组会报错。20 NSMutableArray * arrM = [NSMutableArray arrayWithArray:arrFaces];21 BOOL isHaveSameFace = NO;22 for (NSDictionary * dic in arrFaces)23 {24 //NSLog(@"%ld--%ld",button.tag,[dic[@"faceTag"] integerValue]);25 NSString * strFace = self.arrFace[button.tag][@"chs"];26 NSString * strFaceDic = dic[@"chs"];27 if ([strFace isEqualToString:strFaceDic])28 {29 [arrM removeObject:dic];30 NSLog(@"%@",dic);31 //后添加的排在前面；32 [arrM insertObject:dic atIndex:0];33 isHaveSameFace = YES;34 }35 }36 if (!isHaveSameFace)37 {38 NSDictionary * dicFace = @{@"png":self.arrFace[button.tag][@"png"],@"faceTag":@(button.tag),@"chs":self.arrFace[button.tag][@"chs"]};39 [arrM insertObject:dicFace atIndex:0];40 }41 [defaults setObject:arrM forKey:@"RecentlyFaces"];42 [defaults synchronize];43 }44 //block传值45 self.block(self.arrFace[button.tag][@"chs"],button.tag);46 }47 48 //点击删除49 - (void)tapDeleteBtn50 {51 self.deleteBlock();52 }53 54 -(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset55 {56 self.pageC.currentPage = targetContentOffset->x / ScreenWidth;57 } View Code d、设置toolBar、然后将各个按钮的点击事件实现：
1 - (void)setToolBar 2 { 3 self.toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, self.scFace.frame.size.height, ScreenWidth, ToolBarHeight)]; 4 self.toolBar.backgroundColor = GrayColor; 5 6 [self addSubview:self.toolBar]; 7 UIBarButtonItem * spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 8 UIBarButtonItem * recentlyFaceItem = [[UIBarButtonItem alloc] initWithTitle:@"最近表情" style:UIBarButtonItemStylePlain target:self action:@selector(tapRecentlyFaceBtn)]; 9 UIBarButtonItem * normalFaceItem = [[UIBarButtonItem alloc] initWithTitle:@"普通" style:UIBarButtonItemStylePlain target:self action:@selector(tapNormalFaceBtn)];10 UIBarButtonItem * bigFaceItem = [[UIBarButtonItem alloc] initWithTitle:@"大表情" style:UIBarButtonItemStylePlain target:self action:@selector(tapBigFaceBtn)];11 UIBarButtonItem * sendItem = [[UIBarButtonItem alloc] initWithTitle:@"发送" style:UIBarButtonItemStylePlain target:self action:@selector(tapSendBtn)];12 13 [self.toolBar setItems:[NSArray arrayWithObjects:recentlyFaceItem,spaceItem,normalFaceItem,spaceItem,bigFaceItem,spaceItem,sendItem, nil]];14 }15 16 17 //点击ToolBar上的按钮回调18 - (void)tapRecentlyFaceBtn19 {20 [self fetchRecentlyFaces];21 }22 - (void)tapSendBtn23 {24 self.sendBlock();25 }26 - (void)tapBigFaceBtn{27 [self fetchBigFaces];28 }29 - (void)tapNormalFaceBtn30 {31 [self fetchAllFaces];32 } View Code e、还要实现三个设置回调接口的方法、此时faceKeyBoardView中的方法都实现了；
1 //点击表情接口 2 - (void)setFaceKeyBoardBlock:(FaceKeyBoardBlock)block 3 { 4 self.block = block; 5 } 6 //发送接口 7 -(void)setFaceKeyBoardSendBlock:(FaceKeyBoardSendBlock)block 8 { 9 self.sendBlock = block;10 }11 //删除接口12 -(void)setFaceKeyBoardDeleteBlock:(FaceKeyBoardDeleteBlock)block13 {14 self.deleteBlock = block;15 } View Code 3、自定义一个UITextView、也可以使用UITextFiledView
.h: 具有一个发送回调以及切换键盘状态的方法：
1 #import "XQGTextView.h"2 #import "FaceKeyBoardView.h"3 4 @interface XQGTextView ()5 6 @property (nonatomic, strong)FaceKeyBoardView * viewFaceKB;7 @property (nonatomic, strong)SendBlock block;8 @endView Code
.m: 实现方法以及初始化表情键盘，在faceKeyBoard发送回调和删除回调中实现需要做的事；
1 @implementation XQGTextView 2 3 - (instancetype)initWithFrame:(CGRect)frame 4 { 5 self = [super initWithFrame:frame]; 6 if (self) { 7 [self loadFaceKeyBoardView]; 8 } 9 return self;10 }11 12 - (void)awakeFromNib13 {14 [self loadFaceKeyBoardView];15 }16 17 - (void)loadFaceKeyBoardView18 {19 self.viewFaceKB = [[FaceKeyBoardView alloc] init];20 21 __weak __block XQGTextView * copy_self = self;22 23 [self.viewFaceKB setFaceKeyBoardBlock:^(NSString *faceName, NSInteger faceTag) {24 copy_self.text = [copy_self.text stringByAppendingString:faceName];25 }];26 27 [self.viewFaceKB setFaceKeyBoardSendBlock:^{28 copy_self.block();29 //清空textview30 copy_self.text = nil;31 }];32 [self.viewFaceKB setFaceKeyBoardDeleteBlock:^{33 NSMutableString * string = [[NSMutableString alloc] initWithString:copy_self.text];34 [string deleteCharactersInRange:NSMakeRange(copy_self.text.length - 1, 1)];35 copy_self.text = string;36 }];37 }38 39 -(void)changeKeyBoard40 {41 if (self.inputView != nil)42 {43 self.inputView = nil;44 [self reloadInputViews];45 }46 else47 {48 self.inputView = self.viewFaceKB;49 [self reloadInputViews];50 }51 }52 53 - (void)setFaceKeyBoard54 {55 self.inputView = self.viewFaceKB;56 }57 58 - (void)setSendBlock:(SendBlock)block59 {60 self.block = block;61 }62 63 @end View Code 4、在VC中进行操作：
a、在storyBoard中构建聊天工具栏：将textView绑定为我自定义的textView；
b、在发送回调中进行发送消息，利用正则表达式解析出表情发送图文混排的消息；以及聊天工具栏跟随键盘高度变化而变化的设置等；点击表情按钮弹出表情键盘，键盘切换；代码中都有详细描述；
.m:
1 #import "MainViewController.h" 2 #import "XQGTextView.h" 3 4 @interface MainViewController ()<UITextViewDelegate> 5 6 @property (weak, nonatomic) IBOutlet XQGTextView *viewText; 7 @property (weak, nonatomic) IBOutlet UIView *viewChatToolBar; 8 @property (weak, nonatomic) IBOutlet UILabel *lalText; 9 10 @end 11 12 @implementation MainViewController 13 14 - (void)viewDidLoad { 15 [super viewDidLoad]; 16 //清空常用表情 17 // NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults]; 18 // NSMutableArray * arrFaces = [defaults objectForKey:@"RecentlyFaces"]; 19 // arrFaces = nil; 20 // [defaults setObject:arrFaces forKey:@"RecentlyFaces"]; 21 22 self.viewText.delegate = self; 23 //发送回调 24 [self.viewText setSendBlock:^{ 25 [self sendPictureAndText]; 26 }]; 27 //监听键盘弹出的通知 28 NSNotificationCenter *center = [NSNotificationCenter defaultCenter]; 29 [center addObserver:self selector:@selector(KeyBoardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil]; 30 } 31 32 //发送图文 33 - (void)sendPictureAndText 34 { 35 //正则表达式取出表情 36 NSString * str = self.viewText.text; 37 NSMutableAttributedString * strAtt = [[NSMutableAttributedString alloc] initWithString:str]; 38 //创建匹配正则表达式类型描述模板 39 NSString * pattern = @"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+\\]"; 40 //依据正则表达式创建匹配对象 41 NSError * error = nil; 42 //CaseInsensitive 43 NSRegularExpression * regular = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error]; 44 if (regular == nil) 45 { 46 NSLog(@"正则创建失败"); 47 NSLog(@"%@",error.localizedDescription); 48 return; 49 } 50 //把搜索出来的结果存到数组中 51 NSArray * result = [regular matchesInString:strAtt.string options:NSMatchingReportCompletion range:NSMakeRange(0, strAtt.string.length)]; 52 53 NSString * path = [[NSBundle mainBundle] pathForResource:@"emoticons.plist" ofType:nil]; 54 NSArray * arrPlist = [NSArray arrayWithContentsOfFile:path]; 55 56 for (NSInteger i = result.count - 1; i >= 0; i--) 57 { 58 NSTextCheckingResult * r = result[i]; 59 //NSLog(@"%@",NSStringFromRange(r.range)); 60 NSString * imageStr = [strAtt.string substringWithRange:r.range]; 61 //NSLog(@"%@",imageStr); 62 63 for (NSDictionary * dic in arrPlist) 64 { 65 if ([dic[@"chs"] isEqualToString:imageStr]) 66 { 67 NSTextAttachment * textAtt = [[NSTextAttachment alloc] init]; 68 textAtt.image = [UIImage imageNamed:dic[@"png"]]; 69 NSAttributedString * strImage = [NSAttributedString attributedStringWithAttachment:textAtt]; 70 [strAtt replaceCharactersInRange:r.range withAttributedString:strImage]; 71 } 72 } 73 } 74 self.lalText.attributedText = strAtt; 75 } 76 77 //监听键盘弹出的方法 78 -(void)KeyBoardWillChangeFrame: (NSNotification *)noteInfo 79 { 80 //获取键盘的Y值 81 CGRect keySize = [noteInfo.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; 82 CGFloat keyY = keySize.origin.y; 83 //让view跟随键盘移动 84 CGFloat viewY = keyY - self.view.bounds.size.height; 85 //让view变化和键盘变化一致 86 self.view.transform = CGAffineTransformMakeTranslation(0, viewY); 87 } 88 89 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 90 { 91 UITouch * touch = [touches anyObject]; 92 if ([touch.view isEqual:self.view]) { 93 [self.view endEditing:YES]; 94 } 95 } 96 //监控编辑结束状态 97 -(void)textViewDidEndEditing:(UITextView *)textView 98 { 99 self.viewText.inputView = nil;100 }101 102 103 - (IBAction)tapVoice:(UIButton *)sender {104 NSLog(@"切换语音");105 }106 107 - (IBAction)tapFace:(UIButton *)sender108 {109 //如果还没弹出键盘就直接弹出表情键盘；弹出了就改变键盘样式110 if (self.viewText.isFirstResponder)111 {112 [self.viewText changeKeyBoard];113 }114 else115 {116 [self.viewText setFaceKeyBoard];117 [self.viewText becomeFirstResponder];118 }119 }120 121 - (IBAction)tapMoreFunction:(UIButton *)sender {122 NSLog(@"更多功能");123 }124 125 126 @end View Code 这样，自定义表情键盘就实现了，聊天工具栏还需要进行进一步的封装；
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