Implementierung der WeChat-Chatseite für die iOS-Entwicklung

　　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。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：

#import "TextCell.h"

@interface TextCell()

@property (strong, nonatomic) IBOutlet UIImageView *headImageView;
@property (strong, nonatomic) IBOutlet UIImageView *chatBgImageView;
@property (strong, nonatomic) IBOutlet UITextView *chatTextView;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *chatBgImageWidthConstraint;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *chatTextWidthConstaint;
@property (strong, nonatomic) NSMutableAttributedString *attrString;

@end

@implementation TextCell

-(void)setCellValue:(NSMutableAttributedString *)str
{
    //移除约束
    [self removeConstraint:_chatBgImageWidthConstraint];
    [self removeConstraint:_chatTextWidthConstaint];
    
    self.attrString = str;
    NSLog(@"%@",self.attrString);
    
    //由text计算出text的宽高
      CGRect bound = [self.attrString boundingRectWithSize:CGSizeMake(150, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil];
   
    //根据text的宽高来重新设置新的约束
    //背景的宽
    NSString *widthImageString;
    NSArray *tempArray;
    
    widthImageString = [NSString stringWithFormat:@"H:[_chatBgImageView(%f)]", bound.size.width+45];
    tempArray = [NSLayoutConstraint constraintsWithVisualFormat:widthImageString options:0 metrics:0 views:NSDictionaryOfVariableBindings(_chatBgImageView)];
    _chatBgImageWidthConstraint = tempArray[0];
    [self addConstraint:self.chatBgImageWidthConstraint];
    
    widthImageString = [NSString stringWithFormat:@"H:[_chatTextView(%f)]", bound.size.width+20];
    tempArray = [NSLayoutConstraint constraintsWithVisualFormat:widthImageString options:0 metrics:0 views:NSDictionaryOfVariableBindings(_chatTextView)];
    _chatBgImageWidthConstraint = tempArray[0];
    [self addConstraint:self.chatBgImageWidthConstraint];
    
    //设置图片
    UIImage *image = [UIImage imageNamed:@"chatfrom_bg_normal.png"];
    image = [image resizableImageWithCapInsets:(UIEdgeInsetsMake(image.size.height * 0.6, image.size.width * 0.4, image.size.height * 0.3, image.size.width * 0.4))];
    
    //image = [image stretchableImageWithLeftCapWidth:image.size.width * 0.5 topCapHeight:image.size.height * 0.5];
    
    
    
    [self.chatBgImageView setImage:image];
    
    self.chatTextView.attributedText = str;
    
    
}

@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。

#import "MyImageCell.h"

@interface MyImageCell()
@property (strong, nonatomic) IBOutlet UIImageView *bgImageView;
@property (strong, nonatomic) IBOutlet UIButton *imageButton;
@property (strong, nonatomic) ButtonImageBlock imageBlock;
@property (strong, nonatomic) UIImage *buttonImage;

@end

@implementation MyImageCell

-(void)setCellValue:(UIImage *)sendImage
{
    self.buttonImage = sendImage;
    UIImage *image = [UIImage imageNamed:@"chatto_bg_normal.png"];
    image = [image resizableImageWithCapInsets:(UIEdgeInsetsMake(image.size.height * 0.6, image.size.width * 0.4, image.size.height * 0.3, image.size.width * 0.4))];
    [self.bgImageView setImage:image];
    [self.imageButton setImage:sendImage forState:UIControlStateNormal];

}

-(void)setButtonImageBlock:(ButtonImageBlock)block
{
    self.imageBlock = block;
}

- (IBAction)tapImageButton:(id)sender {
    self.imageBlock(self.buttonImage);
}

@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：

#import "VoiceCellTableViewCell.h"

@interface VoiceCellTableViewCell()

@property (strong, nonatomic) NSURL *playURL;
@property (strong, nonatomic) AVAudioPlayer *audioPlayer;

@end

@implementation VoiceCellTableViewCell

-(void)setCellValue:(NSDictionary *)dic
{
    _playURL = dic[@"body"][@"content"];
}

- (IBAction)tapVoiceButton:(id)sender {
    
    
    NSError *error = nil;
    AVAudioPlayer *player = [[AVAudioPlayer alloc]initWithContentsOfURL:_playURL error:&error];
    if (error) {
        NSLog(@"播放错误：%@",[error description]);
    }
    self.audioPlayer = player;
    [self.audioPlayer play];
}
@end

二，cell搞定后要实现我们的ChatController部分　　　　

ChatController.m中的延展和枚举代码如下：

//枚举Cell类型
typedef enum : NSUInteger {
    SendText,
    SendVoice,
    SendImage
} MySendContentType;


//枚举用户类型
typedef enum : NSUInteger {
    MySelf,
    MyFriend
} UserType;

@interface ChatViewController ()

//工具栏
@property (nonatomic,strong) ToolView *toolView;

//音量图片
@property (strong, nonatomic) UIImageView *volumeImageView;

//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
@property (strong, nonatomic) NSLayoutConstraint *tooViewConstraintHeight;

//存放所有的cell中的内容
@property (strong, nonatomic) NSMutableArray *dataSource;

//storyBoard上的控件
@property (strong, nonatomic) IBOutlet UITableView *myTableView;

//用户类型
@property (assign, nonatomic) UserType userType;

//从相册获取图片
@property (strong, nonatomic) UIImagePickerController *imagePiceker;

@end

实现工具栏中的回调的代码如下，通过Block,工具栏和ViewController交互

//实现工具栏的回调
-(void)setToolViewBlock
{
    __weak __block ChatViewController *copy_self = self;
    //通过block回调接收到toolView中的text
    [self.toolView setMyTextBlock:^(NSString *myText) {
        NSLog(@"%@",myText);
        
        [copy_self sendMessage:SendText Content:myText];
    }];
    
    
    //回调输入框的contentSize,改变工具栏的高度
    [self.toolView setContentSizeBlock:^(CGSize contentSize) {
         [copy_self updateHeight:contentSize];
    }];
    
    
    //获取录音声量，用于声音音量的提示
    [self.toolView setAudioVolumeBlock:^(CGFloat volume) {
        
        copy_self.volumeImageView.hidden = NO;
        int index = (int)(volume*100)%6+1;
        [copy_self.volumeImageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"record_animate_%02d.png",index]]];
    }];
    
    //获取录音地址（用于录音播放方法）
    [self.toolView setAudioURLBlock:^(NSURL *audioURL) {
        copy_self.volumeImageView.hidden = YES;
        
        [copy_self sendMessage:SendVoice Content:audioURL];
    }];
    
    //录音取消（录音取消后，把音量图片进行隐藏）
    [self.toolView setCancelRecordBlock:^(int flag) {
        if (flag == 1) {
            copy_self.volumeImageView.hidden = YES;
        }
    }];
    
    
    //扩展功能回调
    [self.toolView setExtendFunctionBlock:^(int buttonTag) {
        switch (buttonTag) {
            case 1:
                //从相册获取
                [copy_self presentViewController:copy_self.imagePiceker animated:YES completion:^{
                    
                }];
                break;
            case 2:
                //拍照
                break;
                
            default:
                break;
        }
    }];
}

把聊天工具栏中返回的内容显示在tableView中，代码如下：

//发送消息
-(void)sendMessage:(MySendContentType) sendType Content:(id)content
{
    
    //把收到的url封装成字典
    UserType userType = self.userType;
    
    NSMutableDictionary *tempDic = [[NSMutableDictionary alloc] initWithCapacity:2];
    [tempDic setValue:@(userType) forKey:@"userType"];
    
    NSDictionary *bodyDic = @{@"type":@(sendType),
                              @"content":content};
    [tempDic setValue:bodyDic forKey:@"body"];
    [self.dataSource addObject:tempDic];
    
    //重载tableView
    [self.myTableView  reloadData];
    
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.dataSource.count-1 inSection:0];
    
    [self.myTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
    
 
}

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：

//更新toolView的高度约束
-(void)updateHeight:(CGSize)contentSize
{
    float height = contentSize.height + 18;
    if (height <= 80) {
        [self.view removeConstraint:self.tooViewConstraintHeight];
        
        NSString *string = [NSString stringWithFormat:@"V:[_toolView(%f)]", height];
        
        NSArray * tooViewConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:string options:0 metrics:0 views:NSDictionaryOfVariableBindings(_toolView)];
        self.tooViewConstraintHeight = tooViewConstraintV[0];
        [self.view addConstraint:self.tooViewConstraintHeight];
    }
}

从本地获取图片，并显示在相应的Cell上，代码如下：

//获取图片后要做的方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *pickerImage = info[UIImagePickerControllerEditedImage];
    
    //发送图片
    [self sendMessage:SendImage Content:pickerImage];
    
    [self dismissViewControllerAnimated:YES completion:^{}];
    
}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    //在ImagePickerView中点击取消时回到原来的界面
    [self dismissViewControllerAnimated:YES completion:^{}];
}

把NSString 转换成NSMutableAttributeString,用于显示表情，代码如下：

//显示表情,用属性字符串显示表情
-(NSMutableAttributedString *)showFace:(NSString *)str
{
    //加载plist文件中的数据
    NSBundle *bundle = [NSBundle mainBundle];
    //寻找资源的路径
    NSString *path = [bundle pathForResource:@"emoticons" ofType:@"plist"];
    //获取plist中的数据
    NSArray *face = [[NSArray alloc] initWithContentsOfFile:path];
    
    //创建一个可变的属性字符串
    
    NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:str];
    
    UIFont *baseFont = [UIFont systemFontOfSize:17];
    [attributeString addAttribute:NSFontAttributeName value:baseFont
                       range:NSMakeRange(0, str.length)];
    
    //正则匹配要替换的文字的范围
    //正则表达式
    NSString * pattern = @"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+\\]";
    NSError *error = nil;
    NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
    
    if (!re) {
        NSLog(@"%@", [error localizedDescription]);
    }
    
    //通过正则表达式来匹配字符串
    NSArray *resultArray = [re matchesInString:str options:0 range:NSMakeRange(0, str.length)];
    
    
    //用来存放字典，字典中存储的是图片和图片对应的位置
    NSMutableArray *imageArray = [NSMutableArray arrayWithCapacity:resultArray.count];
    
    //根据匹配范围来用图片进行相应的替换
    for(NSTextCheckingResult *match in resultArray) {
        //获取数组元素中得到range
        NSRange range = [match range];
        
        //获取原字符串中对应的值
        NSString *subStr = [str substringWithRange:range];
        
        for (int i = 0; i < face.count; i ++)
        {
            if ([face[i][@"chs"] isEqualToString:subStr])
            {
                
                //face[i][@"gif"]就是我们要加载的图片
                //新建文字附件来存放我们的图片
                NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
                
                //给附件添加图片
                textAttachment.image = [UIImage imageNamed:face[i][@"png"]];
                
                //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
                NSAttributedString *imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
                
                //把图片和图片对应的位置存入字典中
                NSMutableDictionary *imageDic = [NSMutableDictionary dictionaryWithCapacity:2];
                [imageDic setObject:imageStr forKey:@"image"];
                [imageDic setObject:[NSValue valueWithRange:range] forKey:@"range"];
                
                //把字典存入数组中
                [imageArray addObject:imageDic];
                
            }
        }
    }
    
    //从后往前替换
    for (int i = imageArray.count -1; i >= 0; i--)
    {
        NSRange range;
        [imageArray[i][@"range"] getValue:&range];
        //进行替换
        [attributeString replaceCharactersInRange:range withAttributedString:imageArray[i][@"image"]];
        
    }
    
    return  attributeString;
}

根据Cell显示内容来调整Cell的高度，代码如下：

//调整cell的高度
-(float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    //根据文字计算cell的高度
    if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendText)]) {
        NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]];
        
        CGRect textBound = [contentText boundingRectWithSize:CGSizeMake(150, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil];
        
        float height = textBound.size.height + 40;
        return height;
    }
    if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendVoice)])
    {
        return 73;
    }
    
    if ([self.dataSource[indexPath.row][@"body"][@"type"] isEqualToNumber:@(SendImage)])
    {
        return 125;
    }
    
    return 100;
 }

根据cell内容和用户类型，来选择Cell,代码如下：

//设置cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //根据类型选cell
    MySendContentType contentType = [self.dataSource[indexPath.row][@"body"][@"type"] integerValue];
    
    
    if ([self.dataSource[indexPath.row][@"userType"]  isEqual: @(MyFriend)]) {
        switch (contentType) {
            case SendText:
            {
                TextCell *cell = [tableView dequeueReusableCellWithIdentifier:@"textCell" forIndexPath:indexPath];
                NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]];
                [cell setCellValue:contentText];
                return cell;
            }
                break;
                
            case SendImage:
            {
                heImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"heImageCell" forIndexPath:indexPath];
                [cell setCellValue:self.dataSource[indexPath.row][@"body"][@"content"]];
                
                
                __weak __block ChatViewController *copy_self = self;
                
                //传出cell中的图片
                [cell setButtonImageBlock:^(UIImage *image) {
                    [copy_self displaySendImage:image];
                }];
                return cell;
            }
                break;
                
            case SendVoice:
            {
                VoiceCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"heVoiceCell" forIndexPath:indexPath];
                [cell setCellValue:self.dataSource[indexPath.row]];
                return cell;
            }

                break;
                
            default:
                break;
        }

    }
        

    if ([self.dataSource[indexPath.row][@"userType"]  isEqual: @(MySelf)]) {
    
        switch (contentType) {
            case SendText:
            {
                TextCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myselfTextCell" forIndexPath:indexPath];
                NSMutableAttributedString *contentText = [self showFace:self.dataSource[indexPath.row][@"body"][@"content"]];
                [cell setCellValue:contentText];
                return cell;
            }
            break;
            
            case SendImage:
            {
                MyImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myImageCell" forIndexPath:indexPath];
                [cell setCellValue:self.dataSource[indexPath.row][@"body"][@"content"]];
                
                __weak __block ChatViewController *copy_self = self;
                
                //传出cell中的图片
                [cell setButtonImageBlock:^(UIImage *image) {
                    [copy_self displaySendImage:image];
                }];

                
                return cell;
            }
                break;
            
            case SendVoice:
            {
                VoiceCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myVoiceCell" forIndexPath:indexPath];
                [cell setCellValue:self.dataSource[indexPath.row]];
                return cell;
            }

                break;
                
            default:
                break;
        }
    }
    UITableViewCell *cell;
    return cell;
}

点击发送的图片来放大图片代码如下：

//发送图片的放大
-(void) displaySendImage : (UIImage *)image
{
    //把照片传到放大的controller中
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
    
    ImageViewController *imageController = [storyboard instantiateViewControllerWithIdentifier:@"imageController"];
    [imageController setValue:image forKeyPath:@"image"];
    
   [self.navigationController pushViewController:imageController animated:YES];
    

}

根据键盘的高度来调整ToolView的位置，代码如下：

//键盘出来的时候调整tooView的位置
-(void) keyChange:(NSNotification *) notify
{
    NSDictionary *dic = notify.userInfo;
    
    
    CGRect endKey = [dic[@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];
    //坐标系的转换
    CGRect endKeySwap = [self.view convertRect:endKey fromView:self.view.window];
    //运动时间
    [UIView animateWithDuration:[dic[UIKeyboardAnimationDurationUserInfoKey] floatValue] animations:^{
        
        [UIView setAnimationCurve:[dic[UIKeyboardAnimationCurveUserInfoKey] doubleValue]];
        CGRect frame = self.view.frame;
        
        frame.size.height = endKeySwap.origin.y;
        
        self.view.frame = frame;
        [self.view layoutIfNeeded];
    }];
}

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：

- (IBAction)tapPichGesture:(id)sender {
    UIPinchGestureRecognizer *gesture = sender;
    
    //手势改变时
    if (gesture.state == UIGestureRecognizerStateChanged)
    {
        
        //捏合手势中scale属性记录的缩放比例
        self.myImageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
    }
    
}

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