微信大家基本上都用过，今天要做的就是微信的聊天工具条。聊天工具条还是比较复杂的，其中包括发送表情，发送文字，发送图片，发送声音，拍照等等功能，下面给出发送录音，文字，表情的代码，其他的和这几样类似。还是那句话百字不如一图，先来几张效果图吧。
在封装聊天工具条的的时候表情键盘是之前封装好的，所以拿过来就可以用的啦。因为不管是工具条还是表情键盘都是用约束来控件大小的，所以横屏也是没问题的，在大屏手机上也是没问题的。下面将会一步步讲解如何封装下面的聊天工具条。主要是对工具条的封装，表情键盘在这就不做讲解了。
一、ToolView预留的接口
在封装ToolView中主要用到Block回调，读者可以根据自己的个人习惯来选择是Block回调，还是委托回调或者是目标动作回调（笔者更喜欢Block回调）,下面的代码是ToolView给调用者提供的接口
//// ToolView.h// MecroMessage//// Created by （青玉伏案）on 14-9-22.// Copyright (c) 2014年 Mrli. All rights reserved.//#import <UIKit/UIKit.h>//定义block类型把ToolView中TextView中的文字传入到Controller中typedef void (^MyTextBlock) (NSString *myText);//录音时的音量typedef void (^AudioVolumeBlock) (CGFloat volume);//录音存储地址typedef void (^AudioURLBlock) (NSURL *audioURL);//改变根据文字改变TextView的高度typedef void (^ContentSizeBlock)(CGSize contentSize);//录音取消的回调typedef void (^CancelRecordBlock)(int flag);@interface ToolView : UIView<UITextViewDelegate,AVAudioRecorderDelegate>//设置MyTextBlock-(void) setMyTextBlock:(MyTextBlock)block;//设置声音回调-(void) setAudioVolumeBlock:(AudioVolumeBlock) block;//设置录音地址回调-(void) setAudioURLBlock:(AudioURLBlock) block;-(void)setContentSizeBlock:(ContentSizeBlock) block;-(void)setCancelRecordBlock:(CancelRecordBlock)block;-(void) changeFunctionHeight: (float) height;@end
二、初始化ToolView中所需的控件
1.为了更好的封装我们的组件，在.h中预留接口，在ToolView.m的延展中添加我们要使用的组件（私有属性），延展代码如下：
@interface ToolView()//最左边发送语音的按钮@property (nonatomic, strong) UIButton *voiceChangeButton;//发送语音的按钮@property (nonatomic, strong) UIButton *sendVoiceButton;//文本视图@property (nonatomic, strong) UITextView *sendTextView;//切换键盘@property (nonatomic, strong) UIButton *changeKeyBoardButton;//More@property (nonatomic, strong) UIButton *moreButton;//键盘坐标系的转换@property (nonatomic, assign) CGRect endKeyBoardFrame;//表情键盘@property (nonatomic, strong) FunctionView *functionView;//more@property (nonatomic, strong) MoreView *moreView;//数据model@property (strong, nonatomic) ImageModelClass *imageMode;@property (strong, nonatomic)HistoryImage *tempImage;//传输文字的block回调@property (strong, nonatomic) MyTextBlock textBlock;//contentsinz@property (strong, nonatomic) ContentSizeBlock sizeBlock;//传输volome的block回调@property (strong, nonatomic) AudioVolumeBlock volumeBlock;//传输录音地址@property (strong, nonatomic) AudioURLBlock urlBlock;//录音取消@property (strong, nonatomic) CancelRecordBlock cancelBlock;//添加录音功能的属性@property (strong, nonatomic) AVAudioRecorder *audioRecorder;@property (strong, nonatomic) NSTimer *timer;@property (strong, nonatomic) NSURL *audioPlayURL;@end
2.接受相应的Block回调,把block传入ToolView中，代码如下：
-(void)setMyTextBlock:(MyTextBlock)block{ self.textBlock = block;}-(void)setAudioVolumeBlock:(AudioVolumeBlock)block{ self.volumeBlock = block;}-(void)setAudioURLBlock:(AudioURLBlock)block{ self.urlBlock = block;}-(void)setContentSizeBlock:(ContentSizeBlock)block{ self.sizeBlock = block;}-(void)setCancelRecordBlock:(CancelRecordBlock)block{ self.cancelBlock = block;}3.控件的初始化，纯代码添加ToolView中要用到的组件（分配内存，配置相应的属性），因为是自定义组件的封装，所以我们的storyboard就用不上啦，添加控件的代码如下：
//控件的初始化-(void) addSubview{ self.voiceChangeButton = [[UIButton alloc] initWithFrame:CGRectZero]; [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal]; [self.voiceChangeButton addTarget:self action:@selector(tapVoiceChangeButton:) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:self.voiceChangeButton]; self.sendVoiceButton = [[UIButton alloc] initWithFrame:CGRectZero]; [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal]; [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [self.sendVoiceButton setTitle:@"按住说话" forState:UIControlStateNormal]; [self.sendVoiceButton addTarget:self action:@selector(tapSendVoiceButton:) forControlEvents:UIControlEventTouchUpInside]; self.sendVoiceButton.hidden = YES; [self addSubview:self.sendVoiceButton]; self.sendTextView = [[UITextView alloc] initWithFrame:CGRectZero]; self.sendTextView.delegate = self; [self addSubview:self.sendTextView]; self.changeKeyBoardButton = [[UIButton alloc] initWithFrame:CGRectZero]; [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal]; [self.changeKeyBoardButton addTarget:self action:@selector(tapChangeKeyBoardButton:) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:self.changeKeyBoardButton]; self.moreButton = [[UIButton alloc] initWithFrame:CGRectZero]; [self.moreButton setImage:[UIImage imageNamed:@"chat_bottom_up_nor.png"] forState:UIControlStateNormal]; [self.moreButton addTarget:self action:@selector(tapMoreButton:) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:self.moreButton]; [self addDone]; //实例化FunctionView self.functionView = [[FunctionView alloc] initWithFrame:CGRectMake(0, 0, 320, 216)]; self.functionView.backgroundColor = [UIColor blackColor]; //设置资源加载的文件名 self.functionView.plistFileName = @"emoticons"; __weak __block ToolView *copy_self = self; //获取图片并显示 [self.functionView setFunctionBlock:^(UIImage *image, NSString *imageText) { NSString *str = [NSString stringWithFormat:@"%@%@",copy_self.sendTextView.text, imageText]; copy_self.sendTextView.text = str; //把使用过的图片存入sqlite NSData *imageData = UIImagePNGRepresentation(image); [copy_self.imageMode save:imageData ImageText:imageText]; }]; //给sendTextView添加轻击手势 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)]; [self.sendTextView addGestureRecognizer:tapGesture]; //给sendVoiceButton添加长按手势 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(sendVoiceButtonLongPress:)]; //设置长按时间 longPress.minimumPressDuration = 0.2; [self.sendVoiceButton addGestureRecognizer:longPress]; //实例化MoreView self.moreView = [[MoreView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)]; self.moreView.backgroundColor = [UIColor blackColor]; [self.moreView setMoreBlock:^(NSInteger index) { NSLog(@"MoreIndex = %d",(int)index); }]; }4.给我们的控件添加相应的约束，为了适合不同的屏幕，所以自动布局是少不了的。当然啦给控件添加约束也必须是手写代码啦，添加约束的代码如下：
//给控件加约束-(void)addConstraint{ //给voicebutton添加约束 self.voiceChangeButton.translatesAutoresizingMaskIntoConstraints = NO; NSArray *voiceConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[_voiceChangeButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_voiceChangeButton)]; [self addConstraints:voiceConstraintH]; NSArray *voiceConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[_voiceChangeButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_voiceChangeButton)]; [self addConstraints:voiceConstraintV]; //给MoreButton添加约束 self.moreButton.translatesAutoresizingMaskIntoConstraints = NO; NSArray *moreButtonH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[_moreButton(30)]-5-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_moreButton)]; [self addConstraints:moreButtonH]; NSArray *moreButtonV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[_moreButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_moreButton)]; [self addConstraints:moreButtonV]; //给changeKeyBoardButton添加约束 self.changeKeyBoardButton.translatesAutoresizingMaskIntoConstraints = NO; NSArray *changeKeyBoardButtonH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[_changeKeyBoardButton(33)]-43-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_changeKeyBoardButton)]; [self addConstraints:changeKeyBoardButtonH]; NSArray *changeKeyBoardButtonV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[_changeKeyBoardButton(33)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_changeKeyBoardButton)]; [self addConstraints:changeKeyBoardButtonV]; //给文本框添加约束 self.sendTextView.translatesAutoresizingMaskIntoConstraints = NO; NSArray *sendTextViewConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-45-[_sendTextView]-80-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendTextView)]; [self addConstraints:sendTextViewConstraintH]; NSArray *sendTextViewConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[_sendTextView]-10-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendTextView)]; [self addConstraints:sendTextViewConstraintV]; //语音发送按钮 self.sendVoiceButton.translatesAutoresizingMaskIntoConstraints = NO; NSArray *sendVoiceButtonConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[_sendVoiceButton]-90-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendVoiceButton)]; [self addConstraints:sendVoiceButtonConstraintH]; NSArray *sendVoiceButtonConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-6-[_sendVoiceButton]-6-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendVoiceButton)]; [self addConstraints:sendVoiceButtonConstraintV]; }5.因为我们要发送录音，所以对音频部分的初始化是少不了的，以下代码是对音频的初始化
//录音部分初始化-(void)audioInit{ NSError * err = nil; AVAudioSession *audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err]; if(err){ NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); return; } [audioSession setActive:YES error:&err]; err = nil; if(err){ NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); return; } //通过可变字典进行配置项的加载 NSMutableDictionary *setAudioDic = [[NSMutableDictionary alloc] init]; //设置录音格式(aac格式) [setAudioDic setValue:@(kAudioFormatMPEG4AAC) forKey:AVFormatIDKey]; //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量） [setAudioDic setValue:@(44100) forKey:AVSampleRateKey]; //设置录音通道数1 Or 2 [setAudioDic setValue:@(1) forKey:AVNumberOfChannelsKey]; //线性采样位数 8、16、24、32 [setAudioDic setValue:@16 forKey:AVLinearPCMBitDepthKey]; //录音的质量 [setAudioDic setValue:@(AVAudioQualityHigh) forKey:AVEncoderAudioQualityKey]; NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSString *fileName = [NSString stringWithFormat:@"%ld", (long)[[NSDate date] timeIntervalSince1970]]; NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@.aac", strUrl, fileName]]; _audioPlayURL = url; NSError *error; //初始化 self.audioRecorder = [[AVAudioRecorder alloc]initWithURL:url settings:setAudioDic error:&error]; //开启音量检测 self.audioRecorder.meteringEnabled = YES; self.audioRecorder.delegate = self;}6.添加键盘回收键Done
//给键盘添加done键-(void) addDone{ //TextView的键盘定制回收按钮 UIToolbar * toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)]; UIBarButtonItem * item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(tapDone:)]; UIBarButtonItem * item2 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; UIBarButtonItem * item3 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; toolBar.items = @[item2,item1,item3]; self.sendTextView.inputAccessoryView =toolBar;}三.编写控件的回调方法
控件添加好以后下面要添加触发控件要干的事情：
1.从最复杂的开始，长按发送录音的按钮时，会录音。松开收时会发送（在发送时要判断音频的时间，太小不允许发送）。录音时上滑取消录音（删除录音文件）。主要是给录音按钮加了一个LongPress手势，根据手势的状态来做不同的事情。关于手势的内容请参考之前的博客：（iOS开发之手势识别），下面是录音业务逻辑的实现(个人在Coding的时候，感觉这一块是工具条中最复杂的部分)，代码如下：
//长按手势触发的方法-(void)sendVoiceButtonLongPress:(id)sender{ static int i = 1; if ([sender isKindOfClass:[UILongPressGestureRecognizer class]]) { UILongPressGestureRecognizer * longPress = sender; //录音开始 if (longPress.state == UIGestureRecognizerStateBegan) { i = 1; [self.sendVoiceButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; //录音初始化 [self audioInit]; //创建录音文件，准备录音 if ([self.audioRecorder prepareToRecord]) { //开始 [self.audioRecorder record]; //设置定时检测音量变化 _timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(detectionVoice) userInfo:nil repeats:YES]; } } //取消录音 if (longPress.state == UIGestureRecognizerStateChanged) { CGPoint piont = [longPress locationInView:self]; NSLog(@"%f",piont.y); if (piont.y < -20) { if (i == 1) { [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal]; [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; //删除录制文件 [self.audioRecorder deleteRecording]; [self.audioRecorder stop]; [_timer invalidate]; UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"录音取消" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil]; [alter show]; //去除图片用的 self.cancelBlock(1); i = 0; } } } if (longPress.state == UIGestureRecognizerStateEnded) { if (i == 1) { NSLog(@"录音结束"); [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal]; [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; double cTime = self.audioRecorder.currentTime; if (cTime > 1) { //如果录制时间<2 不发送 NSLog(@"发出去"); self.urlBlock(self.audioPlayURL); } else { //删除记录的文件 [self.audioRecorder deleteRecording]; UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"录音时间太短！" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil]; [alter show]; self.cancelBlock(1); } [self.audioRecorder stop]; [_timer invalidate]; } } } }2.下面的代码是检测音量的变化，用于根据音量变化图片，代码如下：
//录音的音量探测- (void)detectionVoice{ [self.audioRecorder updateMeters];//刷新音量数据 //获取音量的平均值 [recorder averagePowerForChannel:0]; //音量的最大值 [recorder peakPowerForChannel:0]; CGFloat lowPassResults = pow(10, (0.05 * [self.audioRecorder peakPowerForChannel:0])); //把声音的音量传给调用者 self.volumeBlock(lowPassResults);}3.轻击输入框时，切换到系统键盘，代码如下：
//轻击sendText切换键盘-(void)tapGesture:(UITapGestureRecognizer *) sender{ if ([self.sendTextView.inputView isEqual:self.functionView]) { self.sendTextView.inputView = nil; [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal]; [self.sendTextView reloadInputViews]; } if (![self.sendTextView isFirstResponder]) { [self.sendTextView becomeFirstResponder]; }}4.通过输入框的文字多少改变toolView的高度，因为输入框的约束是加在ToolView上的，所以需要把输入框的ContentSize通过block传到ToolView的调用者上，让ToolView的父视图来改变ToolView的高度，从而sendTextView的高度也会随着改变的，下面的代码是把ContentSize交给父视图：代码如下：
//通过文字的多少改变toolView的高度-(void)textViewDidChange:(UITextView *)textView{ CGSize contentSize = self.sendTextView.contentSize; self.sizeBlock(contentSize);}效果如下，文字多时TextView的高度也会增大：
5.点击最左边的按钮触发的事件（切换文本输入框和录音按钮），代码如下：
//切换声音按键和文字输入框-(void)tapVoiceChangeButton:(UIButton *) sender{ if (self.sendVoiceButton.hidden == YES) { self.sendTextView.hidden = YES; self.sendVoiceButton.hidden = NO; [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_keyboard_nor.png"] forState:UIControlStateNormal]; if ([self.sendTextView isFirstResponder]) { [self.sendTextView resignFirstResponder]; } } else { self.sendTextView.hidden = NO; self.sendVoiceButton.hidden = YES; [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal]; if (![self.sendTextView isFirstResponder]) { [self.sendTextView becomeFirstResponder]; } }}6.点击return发送文字（通过Block回调传入到父视图上），代码如下：
//发送信息（点击return）- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{ if ([text isEqualToString:@"/n"]) { //通过block回调把text的值传递到Controller中共 self.textBlock(self.sendTextView.text); self.sendTextView.text = @""; return NO; } return YES;}7.录音按钮本身要做的事情（在LongPress没有被触发时调用）代码如下：
//发送声音按钮回调的方法-(void)tapSendVoiceButton:(UIButton *) sender{ NSLog(@"sendVoiceButton"); //点击发送按钮没有触发长按手势要做的事儿 UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"按住录音" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil]; [alter show];}8.调用表情键盘：
//变成表情键盘-(void)tapChangeKeyBoardButton:(UIButton *) sender{ if ([self.sendTextView.inputView isEqual:self.functionView]) { self.sendTextView.inputView = nil; [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal]; [self.sendTextView reloadInputViews]; } else { self.sendTextView.inputView = self.functionView; [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_keyboard_nor.png"] forState:UIControlStateNormal]; [self.sendTextView reloadInputViews]; } if (![self.sendTextView isFirstResponder]) { [self.sendTextView becomeFirstResponder]; } if (self.sendTextView.hidden == YES) { self.sendTextView.hidden = NO; self.sendVoiceButton.hidden = YES; [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal]; }}以上就是ToolView的所有封装代码，至于在Controller中如何使用他来发送消息，如何定义聊天Cell,如何处理录音文件，聊天时的气泡是如何实现的等功能，在以后的文章中会继续讲解，希望大家继续关注。
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