在上篇博客（iOS开发之微信聊天工具栏的封装）中对微信聊天页面下方的工具栏进行了封装，本篇博客中就使用之前封装的工具栏来进行聊天页面的编写。在聊天页面中主要用到了TableView的知识，还有如何在俩天中显示我们发送的表情，具体请参考之前的博客：IOS开发之显示微博表情，在这儿就不做赘述啦。在聊天页面用到了三对，六种Cell,不过cell的复杂度要比之前的新浪微博（IOS开发之新浪围脖）简单的多。废话少说吧，还是先来几张效果图，在给出实现代码吧。
聊天界面的效果图如下：在下面的聊天界面中中用到了3类cell,一类是显示文字和表情的，一类是显示录音的，一类是显示图片的。当点击图片时会跳转到另一个Controller中来进行图片显示，在图片显示页面中添加了一个捏合的手势（关于手势，请参考：iOS开发之手势识别）。点击播放按钮，会播放录制的音频，cell的大学会根据内容的多少来调整，而cell中textView的高度是通过约束来设置的。
一，定义我们要用的cell,代码如下：
1，显示表情和text的cell,代码如下，需要根据NSMutableAttributedString求出bound,然后改变cell上的ImageView和TextView的宽度的约束值，动态的调整气泡的大小，具体代码如下：
1 #import "TextCell.h" 2 3 @interface TextCell() 4 5 @PRoperty (strong, nonatomic) IBOutlet UIImageView *headImageView; 6 @property (strong, nonatomic) IBOutlet UIImageView *chatBgImageView; 7 @property (strong, nonatomic) IBOutlet UITextView *chatTextView; 8 @property (strong, nonatomic) IBOutlet NSLayoutConstraint *chatBgImageWidthConstraint; 9 @property (strong, nonatomic) IBOutlet NSLayoutConstraint *chatTextWidthConstaint;10 @property (strong, nonatomic) NSMutableAttributedString *attrString;11 12 @end13 14 @implementation TextCell15 16 -(void)setCellValue:(NSMutableAttributedString *)str17 {18 //移除约束19 [self removeConstraint:_chatBgImageWidthConstraint];20 [self removeConstraint:_chatTextWidthConstaint];21 22 self.attrString = str;23 NSLog(@"%@",self.attrString);24 25 //由text计算出text的宽高26 CGRect bound = [self.attrString boundingRectWithSize:CGSizeMake(150, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil];27 28 //根据text的宽高来重新设置新的约束29 //背景的宽30 NSString *widthImageString;31 NSArray *tempArray;32 33 widthImageString = [NSString stringWithFormat:@"H:[_chatBgImageView(%f)]", bound.size.width+45];34 tempArray = [NSLayoutConstraint constraintsWithVisualFormat:widthImageString options:0 metrics:0 views:NSDictionaryOfVariableBindings(_chatBgImageView)];35 _chatBgImageWidthConstraint = tempArray[0];36 [self addConstraint:self.chatBgImageWidthConstraint];37 38 widthImageString = [NSString stringWithFormat:@"H:[_chatTextView(%f)]", bound.size.width+20];39 tempArray = [NSLayoutConstraint constraintsWithVisualFormat:widthImageString options:0 metrics:0 views:NSDictionaryOfVariableBindings(_chatTextView)];40 _chatBgImageWidthConstraint = tempArray[0];41 [self addConstraint:self.chatBgImageWidthConstraint];42 43 //设置图片44 UIImage *image = [UIImage imageNamed:@"chatfrom_bg_normal.png"];45 image = [image resizableImageWithCapInsets:(UIEdgeInsetsMake(image.size.height * 0.6, image.size.width * 0.4, image.size.height * 0.3, image.size.width * 0.4))];46 47 //image = [image stretchableImageWithLeftCapWidth:image.size.width * 0.5 topCapHeight:image.size.height * 0.5];48 49 50 51 [self.chatBgImageView setImage:image];52 53 self.chatTextView.attributedText = str;54 55 56 }57 58 @end
2.显示图片的cell,通过block回调把图片传到Controller中，用于放大图片使用。
1 #import "MyImageCell.h" 2 3 @interface MyImageCell() 4 @property (strong, nonatomic) IBOutlet UIImageView *bgImageView; 5 @property (strong, nonatomic) IBOutlet UIButton *imageButton; 6 @property (strong, nonatomic) ButtonImageBlock imageBlock; 7 @property (strong, nonatomic) UIImage *buttonImage; 8 9 @end10 11 @implementation MyImageCell12 13 -(void)setCellValue:(UIImage *)sendImage14 {15 self.buttonImage = sendImage;16 UIImage *image = [UIImage imageNamed:@"chatto_bg_normal.png"];17 image = [image resizableImageWithCapInsets:(UIEdgeInsetsMake(image.size.height * 0.6, image.size.width * 0.4, image.size.height * 0.3, image.size.width * 0.4))];18 [self.bgImageView setImage:image];19 [self.imageButton setImage:sendImage forState:UIControlStateNormal];20 21 }22 23 -(void)setButtonImageBlock:(ButtonImageBlock)block24 {25 self.imageBlock = block;26 }27 28 - (IBAction)tapImageButton:(id)sender {29 self.imageBlock(self.buttonImage);30 }31 32 @end
3.显示录音的cell,点击cell上的button,播放对应的录音，代码如下：
1 #import "VoiceCellTableViewCell.h" 2 3 @interface VoiceCellTableViewCell() 4 5 @property (strong, nonatomic) NSURL *playURL; 6 @property (strong, nonatomic) AVAudioPlayer *audioPlayer; 7 8 @end 9 10 @implementation VoiceCellTableViewCell11 12 -(void)setCellValue:(NSDictionary *)dic13 {14 _playURL = dic[@"body"][@"content"];15 }16 17 - (IBAction)tapVoiceButton:(id)sender {18 19 20 NSError *error = nil;21 AVAudioPlayer *player = [[AVAudioPlayer alloc]initWithContentsOfURL:_playURL error:&error];22 if (error) {23 NSLog(@"播放错误：%@",[error description]);24 }25 self.audioPlayer = player;26 [self.audioPlayer play];27 }28 @end
二，cell搞定后要实现我们的ChatController部分
1.ChatController.m中的延展和枚举代码如下：
1 //枚举Cell类型 2 typedef enum : NSUInteger { 3 SendText, 4 SendVoice, 5 SendImage 6 } MySendContentType; 7 8 9 //枚举用户类型10 typedef enum : NSUInteger {11 MySelf,12 MyFriend13 } UserType;14 15 @interface ChatViewController ()16 17 //工具栏18 @property (nonatomic,strong) ToolView *toolView;19 20 //音量图片21 @property (strong, nonatomic) UIImageView *volumeImageView;22 23 //工具栏的高约束，用于当输入文字过多时改变工具栏的约束24 @property (strong, nonatomic) NSLayoutConstraint *tooViewConstraintHeight;25 26 //存放所有的cell中的内容27 @property (strong, nonatomic) NSMutableArray *dataSource;28 29 //storyBoard上的控件30 @property (strong, nonatomic) IBOutlet UITableView *myTableView;31 32 //用户类型33 @property (assign, nonatomic) UserType userType;34 35 //从相册获取图片36 @property (strong, nonatomic) UIImagePickerController *imagePiceker;37 38 @end
2.实现工具栏中的回调的代码如下，通过Block,工具栏和ViewController交互，具体ToolView的Block实现，请参考上一篇博客（iOS开发之微信聊天工具栏的封装），聊天工具栏使用代码如下：
1 //实现工具栏的回调 2 -(void)setToolViewBlock 3 { 4 __weak __block ChatViewController *copy_self = self; 5 //通过block回调接收到toolView中的text 6 [self.toolView setMyTextBlock:^(NSString *myText) { 7 NSLog(@"%@",myText); 8 9 [copy_self sendMessage:SendText Content:myText];10 }];11 12 13 //回调输入框的contentSize,改变工具栏的高度14 [self.toolView setContentSizeBlock:^(CGSize contentSize) {15 [copy_self updateHeight:contentSize];16 }];17 18 19 //获取录音声量，用于声音音量的提示20 [self.toolView setAudioVolumeBlock:^(CGFloat volume) {21 22 copy_self.volumeImageView.hidden = NO;23 int index = (int)(volume*100)%6+1;24 [copy_self.volumeImageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"record_animate_%02d.png",index]]];25 }];26 27 //获取录音地址（用于录音播放方法）28 [self.toolView setAudioURLBlock:^(NSURL *audioURL) {29 copy_self.volumeImageView.hidden = YES;30 31 [copy_self sendMessage:SendVoice Content:audioURL];32 }];33 34 //录音取消（录音取消后，把音量图片进行隐藏）35 [self.toolView setCancelRecordBlock:^(int flag) {36 if (flag == 1) {37 copy_self.volumeImageView.hidden = YES;38 }39 }];40 41 42 //扩展功能回调43 [self.toolView setExtendFunctionBlock:^(int buttonTag) {44 switch (buttonTag) {45 case 1:46 //从相册获取47 [copy_self presentViewController:copy_self.imagePiceker animated:YES completion:^{48 49 }];50 break;51 case 2:52 //拍照53 break;54 55 default:56 break;57 }58 }];59 }
3.把聊天工具栏中返回的内容显示在tableView中，代码如下：
1 //发送消息 2 -(void)sendMessage:(MySendContentType) sendType Content:(id)content 3 { 4 5 //把收到的url封装成字典 6 UserType userType = self.userType; 7 8 NSMutableDictionary *tempDic = [[NSMutableDictionary alloc] initWithCapacity:2]; 9 [tempDic setValue:@(userType) forKey:@"userType"];10 11 NSDictionary *bodyDic = @{@"type":@(sendType),12 @"content":content};13 [tempDic setValue:bodyDic forKey:@"body"];14 [self.dataSource addObject:tempDic];15 16 //重载tableView17 [self.myTableView reloadData];18 19 NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.dataSource.count-1 inSection:0];20 21 [self.myTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];22 23 24 }
4.根据ToolView中回调接口，获取工具栏中textView的ContentSize,通过ContentSize来调整ToolView的高度约束，代码如下：
1 //更新toolView的高度约束 2 -(void)updateHeight:(CGSize)contentSize 3 { 4 float height = contentSize.height + 18; 5 if (height <= 80) { 6 [self.view removeConstraint:self.tooViewConstraintHeight]; 7 8 NSString *string = [NSString stringWithFormat:@"V:[_toolView(%f)]", height]; 9 10 NSArray * tooViewConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:string options:0 metrics:0 views:NSDictionaryOfVariableBindings(_toolView)];11 self.tooViewConstraintHeight = tooViewConstraintV[0];12 [self.view addConstraint:self.tooViewConstraintHeight];13 }14 }
5.从本地获取图片，并显示在相应的Cell上，代码如下：
1 //获取图片后要做的方法 2 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 3 { 4 UIImage *pickerImage = info[UIImagePickerControllerEditedImage]; 5 6 //发送图片 7 [self sendMessage:SendImage Content:pickerImage]; 8 9 [self dismissViewControllerAnimated:YES completion:^{}];10 11 }12 13 -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker14 {15 //在ImagePickerView中点击取消时回到原来的界面16 [self dismissViewControllerAnimated:YES completion:^{}];17 }
6.把NSString 转换成NSMutableAttributeString,用于显示表情，代码如下：
1 //显示表情,用属性字符串显示表情 2 -(NSMutableAttributedString *)showFace:(NSString *)str 3 { 4 //加载plist文件中的数据 5 NSBundle *bundle = [NSBundle mainBundle]; 6 //寻找资源的路径 7 NSString *path = [bundle pathForResource:@"emoticons" ofType:@"plist"]; 8 //获取plist中的数据 9 NSArray *face = [[NSArray alloc] initWithContentsOfFile:path];10 11 //创建一个可变的属性字符串12 13 NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:str];14 15 UIFont *baseFont = [UIFont systemFontOfSize:17];16 [attributeString addAttribute:NSFontAttributeName value:baseFont17 range:NSMakeRange(0, str.length)];18 19 //正则匹配要替换的文字的范围20 //正则表达式21 NSString * pattern = @"//[[a-zA-Z0-9//u4e00-//u9fa5]+//]";22 NSError *error = nil;23 NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];24 25 if (!re) {26 NSLog(@"%@", [error localizedDescription]);27 }28 29 //通过正则表达式来匹配字符串30 NSArray *resultArray = [re matchesInString:str options:0 range:NSMakeRange(0, str.length)];31 32 33 //用来存放字典，字典中存储的是图片和图片对应的位置34 NSMutableArray *imageArray = [NSMutableArray arrayWithCapacity:resultArray.count];35 36 //根据匹配范围来用图片进行相应的替换37 for(NSTextCheckingResult *match in resultArray) {38 //获取数组元素中得到range39 NSRange range = [match range];40 41 //获取原字符串中对应的值42 NSString *subStr = [str substringWithRange:range];43 44 for (int i = 0; i < face.count; i ++)45 {46 if ([face[i][@"chs"] isEqualToString:subStr])47 {48 49 //face[i][@"gif"]就是我们要加载的图片50 //新建文字附件来存放我们的图片51 NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];52 53 //给附件添加图片54 textAttachment.image = [UIImage imageNamed:face[i][@"png"]];55 56 //把附件转换成可变字符串，用于替换掉源字符串中的表情文字57 NSAttributedString *imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];58 59 //把图片和图片对应的位置存入字典中60 NSMutableDictionary *imageDic = [NSMutableDictionary dictionaryWithCapacity:2];61 [imageDic setObject:imageStr forKey:@"image"];62 [imageDic setObject:[NSValue valueWithRange:range] forKey:@"range"];63 64 //把字典存入数组中65 [imageArray addObject:imageDic];66 67 }68 }69 }70 71 //从后往前替换72 for (int i = imageArray.count -1; i >= 0; i--)73 {74 NSRange range;75 [imageArray[i][@"range"] getValue:&range];76 //进行替换77 [attributeString replaceCharactersInRange:range withAttributedString:imageArray[i][@"image"]];78 79 }80 81 return attributeString;82 }
7.根据Cell显示内容来调整Cell的高度，代码如下：
1 //调整cell的高度 2 -(float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 3 { 4 5 //根据文字计算cell的高度 6 if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendText)]) { 7 NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]]; 8 9 CGRect textBound = [contentText boundingRectWithSize:CGSizeMake(150, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil];10 11 float height = textBound.size.height + 40;12 return height;13 }14 if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendVoice)])15 {16 return 73;17 }18 19 if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendImage)])20 {21 return 125;22 }23 24 return 100;25 }
8.根据cell内容和用户类型，来选择Cell,代码如下：
1 //设置cell 2 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 3 { 4 //根据类型选cell 5 MySendContentType contentType = [self.dataSource[indexPath.row][@"body"][@"type"] integerValue]; 6 7 8 if ([self.dataSource[indexPath.row][@"userType"] isEqual: @(MyFriend)]) { 9 switch (contentType) {10 case SendText:11 {12 TextCell *cell = [tableView dequeueReusableCellWithIdentifier:@"textCell" forIndexPath:indexPath];13 NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]];14 [cell setCellValue:contentText];15 return cell;16 }17 break;18 19 case SendImage:20 {21 heImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"heImageCell" forIndexPath:indexPath];22 [cell setCellValue:self.dataSource[indexPath.row][@"body"][@"content"]];23 24 25 __weak __block ChatViewController *copy_self = self;26 27 //传出cell中的图片28 [cell setButtonImageBlock:^(UIImage *image) {29 [copy_self displaySendImage:image];30 }];31 return cell;32 }33 break;34 35 case SendVoice:36 {37 VoiceCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"heVoiceCell" forIndexPath:indexPath];38 [cell setCellValue:self.dataSource[indexPath.row]];39 return cell;40 }41 42 break;43 44 default:45 break;46 }47 48 }49 50 51 if ([self.dataSource[indexPath.row][@"userType"] isEqual: @(MySelf)]) {52 53 switch (contentType) {54 case SendText:55 {56 TextCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myselfTextCell" forIndexPath:indexPath];57 NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]];58 [cell setCellValue:contentText];59 return cell;60 }61 break;62 63 case SendImage:64 {65 MyImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myImageCell" forIndexPath:indexPath];66 [cell setCellValue:self.dataSource[indexPath.row][@"body"][@"content"]];67 68 __weak __block ChatViewController *copy_self = self;69 70 //传出cell中的图片71 [cell setButtonImageBlock:^(UIImage *image) {72 [copy_self displaySendImage:image];73 }];74 75 76 return cell;77 }78 break;79 80 case SendVoice:81 {82 VoiceCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myVoiceCell" forIndexPath:indexPath];83 [cell setCellValue:self.dataSource[indexPath.row]];84 return cell;85 }86 87 break;88 89 default:90 break;91 }92 }93 UITableViewCell *cell;94 return cell;95 }
9.点击发送的图片来放大图片代码如下：
1 //发送图片的放大 2 -(void) displaySendImage : (UIImage *)image 3 { 4 //把照片传到放大的controller中 5 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]]; 6 7 ImageViewController *imageController = [storyboard instantiateViewControllerWithIdentifier:@"imageController"]; 8 [imageController setValue:image forKeyPath:@"image"]; 9 10 [self.navigationController pushViewController:imageController animated:YES];11 12 13 }
10.根据键盘的高度来调整ToolView的位置，代码如下：
1 //键盘出来的时候调整tooView的位置 2 -(void) keyChange:(NSNotification *) notify 3 { 4 NSDictionary *dic = notify.userInfo; 5 6 7 CGRect endKey = [dic[@"UIKeyboardFrameEndUserInfoKey"] CGRectValue]; 8 //坐标系的转换 9 CGRect endKeySwap = [self.view convertRect:endKey fromView:self.view.window];10 //运动时间11 [UIView animateWithDuration:[dic[UIKeyboardAnimationDurationUserInfoKey] floatValue] animations:^{12 13 [UIView setAnimationCurve:[dic[UIKeyboardAnimationCurveUserInfoKey] doubleValue]];14 CGRect frame = self.view.frame;15 16 frame.size.height = endKeySwap.origin.y;17 18 self.view.frame = frame;19 [self.view layoutIfNeeded];20 }];21 }
三，代码有点多，不过在关键的部分都加有注释，在图片显示View中通过捏合手势来调整图片的大小，代码如下：
1 - (IBAction)tapPichGesture:(id)sender { 2 UIPinchGestureRecognizer *gesture = sender; 3 4 //手势改变时 5 if (gesture.state == UIGestureRecognizerStateChanged) 6 { 7 8 //捏合手势中scale属性记录的缩放比例 9 self.myImageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);10 }11 12 }
上面的东西是在本地做的测试，没有加上XMPP即时通讯协议，以后的博客会通过服务器转发来进行聊天，并且会继续对微信进行完善，感兴趣的小伙伴继续关注吧。转载请注明出处。
Demo地址：https://github.com/lizelu/WeChat
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