• iOS开发之微信聊天工具栏的封装

    之前山寨了一个新浪微博（iOS开发之山寨版新浪微博小结），这几天就山寨个微信吧。之前已经把微信的视图结构简单的拖了一下（iOS开发之微信山寨版），今天就开始给微信加上具体的实现功能，那么就先从微信的聊天界面开始吧。提到封装是少不了写代码的，在封装组件的时候，为了组件的可移植性，我们就不能用storyboard来拖拽了。为了屏幕的适配，适应不同屏幕的手机，所以在封装组件的时候是少不了为我们的组件来添加约束。今天博客中的所有代码都是脱离storyboard的，这些代码在别的工程中也是可以使用的。好，废话少说，切入今天的正题。

    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（请参考：“iOS开发之自定义表情键盘(组件封装与自动布局)”），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

     1 //
 2 //  ToolView.h
 3 //  MecroMessage
 4 //
 5 //  Created by （青玉伏案：博客地址（http://www.cnblogs.com/ludashi/）） on 14-9-22.
 6 //  Copyright (c) 2014年 Mrli. All rights reserved.
 7 //
 8 
 9 #import <UIKit/UIKit.h>
10 
11 
12 //定义block类型把ToolView中TextView中的文字传入到Controller中
13 typedef void (^MyTextBlock) (NSString *myText);
14 
15 //录音时的音量
16 typedef void (^AudioVolumeBlock) (CGFloat volume);
17 
18 //录音存储地址
19 typedef void (^AudioURLBlock) (NSURL *audioURL);
20 
21 //改变根据文字改变TextView的高度
22 typedef void (^ContentSizeBlock)(CGSize contentSize);
23 
24 //录音取消的回调
25 typedef void (^CancelRecordBlock)(int flag);
26 
27 
28 @interface ToolView : UIView<UITextViewDelegate,AVAudioRecorderDelegate>
29 
30 
31 //设置MyTextBlock
32 -(void) setMyTextBlock:(MyTextBlock)block;
33 
34 //设置声音回调
35 -(void) setAudioVolumeBlock:(AudioVolumeBlock) block;
36 
37 //设置录音地址回调
38 -(void) setAudioURLBlock:(AudioURLBlock) block;
39 
40 -(void)setContentSizeBlock:(ContentSizeBlock) block;
41 
42 -(void)setCancelRecordBlock:(CancelRecordBlock)block;
43 
44 -(void) changeFunctionHeight: (float) height;
45 
46 @end
    View Code

    　　

    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：

     1 @interface ToolView()
 2 //最左边发送语音的按钮
 3 @property (nonatomic, strong) UIButton *voiceChangeButton;
 4 
 5 //发送语音的按钮
 6 @property (nonatomic, strong) UIButton *sendVoiceButton;
 7 
 8 //文本视图
 9 @property (nonatomic, strong) UITextView *sendTextView;
10 
11 //切换键盘
12 @property (nonatomic, strong) UIButton *changeKeyBoardButton;
13 
14 //More
15 @property (nonatomic, strong) UIButton *moreButton;
16 
17 //键盘坐标系的转换
18 @property (nonatomic, assign) CGRect endKeyBoardFrame;
19 
20 
21 //表情键盘
22 @property (nonatomic, strong) FunctionView *functionView;
23 
24 //more
25 @property (nonatomic, strong) MoreView *moreView;
26 
27 //数据model
28 @property (strong, nonatomic) ImageModelClass  *imageMode;
29 
30 @property (strong, nonatomic)HistoryImage *tempImage;
31 
32 
33 //传输文字的block回调
34 @property (strong, nonatomic) MyTextBlock textBlock;
35 
36 //contentsinz
37 @property (strong, nonatomic) ContentSizeBlock sizeBlock;
38 
39 //传输volome的block回调
40 @property (strong, nonatomic) AudioVolumeBlock volumeBlock;
41 
42 //传输录音地址
43 @property (strong, nonatomic) AudioURLBlock urlBlock;
44 
45 //录音取消
46 @property (strong, nonatomic) CancelRecordBlock cancelBlock;
47 
48 
49 //添加录音功能的属性
50 @property (strong, nonatomic) AVAudioRecorder *audioRecorder;
51 
52 @property (strong, nonatomic) NSTimer *timer;
53 @property (strong, nonatomic) NSURL *audioPlayURL;
54 
55 @end
    View Code

    2.接受相应的Block回调,把block传入ToolView中，代码如下：　　

     1 -(void)setMyTextBlock:(MyTextBlock)block
 2 {
 3     self.textBlock = block;
 4 }
 5 
 6 -(void)setAudioVolumeBlock:(AudioVolumeBlock)block
 7 {
 8     self.volumeBlock = block;
 9 }
10 
11 -(void)setAudioURLBlock:(AudioURLBlock)block
12 {
13     self.urlBlock = block;
14 }
15 
16 -(void)setContentSizeBlock:(ContentSizeBlock)block
17 {
18     self.sizeBlock = block;
19 }
20 
21 -(void)setCancelRecordBlock:(CancelRecordBlock)block
22 {
23     self.cancelBlock = block;
24 }
    View Code

    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：

     1 //控件的初始化
 2 -(void) addSubview
 3 {
 4     self.voiceChangeButton = [[UIButton alloc] initWithFrame:CGRectZero];
 5     [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal];
 6     [self.voiceChangeButton addTarget:self action:@selector(tapVoiceChangeButton:) forControlEvents:UIControlEventTouchUpInside];
 7     [self addSubview:self.voiceChangeButton];
 8     
 9     self.sendVoiceButton = [[UIButton alloc] initWithFrame:CGRectZero];
10     [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal];
11     [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
12     [self.sendVoiceButton setTitle:@"按住说话" forState:UIControlStateNormal];
13     
14     
15     [self.sendVoiceButton addTarget:self action:@selector(tapSendVoiceButton:) forControlEvents:UIControlEventTouchUpInside];
16     self.sendVoiceButton.hidden = YES;
17     [self addSubview:self.sendVoiceButton];
18     
19     self.sendTextView = [[UITextView alloc] initWithFrame:CGRectZero];
20     self.sendTextView.delegate = self;
21     [self addSubview:self.sendTextView];
22     
23     self.changeKeyBoardButton = [[UIButton alloc] initWithFrame:CGRectZero];
24     [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal];
25     [self.changeKeyBoardButton addTarget:self action:@selector(tapChangeKeyBoardButton:) forControlEvents:UIControlEventTouchUpInside];
26     [self addSubview:self.changeKeyBoardButton];
27     
28     self.moreButton = [[UIButton alloc] initWithFrame:CGRectZero];
29     [self.moreButton setImage:[UIImage imageNamed:@"chat_bottom_up_nor.png"] forState:UIControlStateNormal];
30     [self.moreButton addTarget:self action:@selector(tapMoreButton:) forControlEvents:UIControlEventTouchUpInside];
31     [self addSubview:self.moreButton];
32     
33     [self addDone];
34     
35     
36     
37     //实例化FunctionView
38     self.functionView = [[FunctionView alloc] initWithFrame:CGRectMake(0, 0, 320, 216)];
39     self.functionView.backgroundColor = [UIColor blackColor];
40     
41     //设置资源加载的文件名
42     self.functionView.plistFileName = @"emoticons";
43     
44     __weak __block ToolView *copy_self = self;
45     //获取图片并显示
46     [self.functionView setFunctionBlock:^(UIImage *image, NSString *imageText)
47      {
48          NSString *str = [NSString stringWithFormat:@"%@%@",copy_self.sendTextView.text, imageText];
49          
50          copy_self.sendTextView.text = str;
51          
52          //把使用过的图片存入sqlite
53          NSData *imageData = UIImagePNGRepresentation(image);
54          [copy_self.imageMode save:imageData ImageText:imageText];
55      }];
56     
57     
58     //给sendTextView添加轻击手势
59     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
60     [self.sendTextView addGestureRecognizer:tapGesture];
61     
62     
63     //给sendVoiceButton添加长按手势
64     UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(sendVoiceButtonLongPress:)];
65     //设置长按时间
66     longPress.minimumPressDuration = 0.2;
67     [self.sendVoiceButton addGestureRecognizer:longPress];
68     
69     //实例化MoreView
70     self.moreView = [[MoreView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
71     self.moreView.backgroundColor = [UIColor blackColor];
72     [self.moreView setMoreBlock:^(NSInteger index) {
73         NSLog(@"MoreIndex = %d",(int)index);
74     }];
75 
76     
77 }
    View Code

    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：

     1 //给控件加约束
 2 -(void)addConstraint
 3 {
 4     //给voicebutton添加约束
 5     self.voiceChangeButton.translatesAutoresizingMaskIntoConstraints = NO;
 6     
 7     NSArray *voiceConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[_voiceChangeButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_voiceChangeButton)];
 8     [self addConstraints:voiceConstraintH];
 9     
10     NSArray *voiceConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[_voiceChangeButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_voiceChangeButton)];
11     [self addConstraints:voiceConstraintV];
12     
13     
14     
15     //给MoreButton添加约束
16     self.moreButton.translatesAutoresizingMaskIntoConstraints = NO;
17     
18     NSArray *moreButtonH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[_moreButton(30)]-5-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_moreButton)];
19     [self addConstraints:moreButtonH];
20     
21     NSArray *moreButtonV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[_moreButton(30)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_moreButton)];
22     [self addConstraints:moreButtonV];
23     
24     
25     //给changeKeyBoardButton添加约束
26     self.changeKeyBoardButton.translatesAutoresizingMaskIntoConstraints = NO;
27     
28     NSArray *changeKeyBoardButtonH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[_changeKeyBoardButton(33)]-43-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_changeKeyBoardButton)];
29     [self addConstraints:changeKeyBoardButtonH];
30     
31     NSArray *changeKeyBoardButtonV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[_changeKeyBoardButton(33)]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_changeKeyBoardButton)];
32     [self addConstraints:changeKeyBoardButtonV];
33     
34     
35     //给文本框添加约束
36     self.sendTextView.translatesAutoresizingMaskIntoConstraints = NO;
37     NSArray *sendTextViewConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-45-[_sendTextView]-80-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendTextView)];
38     [self addConstraints:sendTextViewConstraintH];
39     
40     NSArray *sendTextViewConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[_sendTextView]-10-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendTextView)];
41     [self addConstraints:sendTextViewConstraintV];
42     
43     
44     //语音发送按钮
45     self.sendVoiceButton.translatesAutoresizingMaskIntoConstraints = NO;
46     NSArray *sendVoiceButtonConstraintH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[_sendVoiceButton]-90-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendVoiceButton)];
47     [self addConstraints:sendVoiceButtonConstraintH];
48     
49     NSArray *sendVoiceButtonConstraintV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-6-[_sendVoiceButton]-6-|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(_sendVoiceButton)];
50     [self addConstraints:sendVoiceButtonConstraintV];
51     
52     
53 }
    View Code

    　　　　

    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

     1 //录音部分初始化
 2 -(void)audioInit
 3 {
 4     NSError * err = nil;
 5     
 6     AVAudioSession *audioSession = [AVAudioSession sharedInstance];
 7     [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
 8     
 9     if(err){
10         NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
11         return;
12     }
13     
14     [audioSession setActive:YES error:&err];
15     
16     err = nil;
17     if(err){
18         NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
19         return;
20     }
21 
22     //通过可变字典进行配置项的加载
23     NSMutableDictionary *setAudioDic = [[NSMutableDictionary alloc] init];
24     
25     //设置录音格式(aac格式)
26     [setAudioDic setValue:@(kAudioFormatMPEG4AAC) forKey:AVFormatIDKey];
27     
28     //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
29     [setAudioDic setValue:@(44100) forKey:AVSampleRateKey];
30     
31     //设置录音通道数1 Or 2
32     [setAudioDic setValue:@(1) forKey:AVNumberOfChannelsKey];
33     
34     //线性采样位数  8、16、24、32
35     [setAudioDic setValue:@16 forKey:AVLinearPCMBitDepthKey];
36     //录音的质量
37     [setAudioDic setValue:@(AVAudioQualityHigh) forKey:AVEncoderAudioQualityKey];
38     
39     NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
40     
41     NSString *fileName = [NSString stringWithFormat:@"%ld", (long)[[NSDate date] timeIntervalSince1970]];
42     
43     
44     NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@.aac", strUrl, fileName]];
45     _audioPlayURL = url;
46     
47     NSError *error;
48     //初始化
49     self.audioRecorder = [[AVAudioRecorder alloc]initWithURL:url settings:setAudioDic error:&error];
50     //开启音量检测
51     self.audioRecorder.meteringEnabled = YES;
52     self.audioRecorder.delegate = self;
53 
54 }
    View Code

    　　　　

    6.添加键盘回收键Done

     1 //给键盘添加done键
 2 -(void) addDone
 3 {
 4     //TextView的键盘定制回收按钮
 5      UIToolbar * toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
 6  
 7    UIBarButtonItem * item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(tapDone:)];
 8     UIBarButtonItem * item2 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
 9       UIBarButtonItem * item3 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
10     toolBar.items = @[item2,item1,item3];
11     
12      self.sendTextView.inputAccessoryView =toolBar;
13 }
    View Code

    　　　　

    　　

    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：　　

     1 //长按手势触发的方法
 2 -(void)sendVoiceButtonLongPress:(id)sender
 3 {
 4     static int i = 1;
 5     if ([sender isKindOfClass:[UILongPressGestureRecognizer class]]) {
 6         
 7         UILongPressGestureRecognizer * longPress = sender;
 8         
 9         //录音开始
10         if (longPress.state == UIGestureRecognizerStateBegan)
11         {
12             
13             i = 1;
14             
15             [self.sendVoiceButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
16             //录音初始化
17             [self audioInit];
18             
19             //创建录音文件，准备录音
20             if ([self.audioRecorder prepareToRecord])
21             {
22                 //开始
23                 [self.audioRecorder record];
24                 
25                 //设置定时检测音量变化
26                 _timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(detectionVoice) userInfo:nil repeats:YES];
27             }
28         }
29         
30         
31         //取消录音
32         if (longPress.state == UIGestureRecognizerStateChanged)
33         {
34             
35             CGPoint piont = [longPress locationInView:self];
36             NSLog(@"%f",piont.y);
37 
38             if (piont.y < -20)
39             {
40                 if (i == 1) {
41                     
42                     [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal];
43                     [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
44                     //删除录制文件
45                     [self.audioRecorder deleteRecording];
46                     [self.audioRecorder stop];
47                     [_timer invalidate];
48                     
49                     UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"录音取消" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil];
50                     [alter show];
51                     //去除图片用的
52                     self.cancelBlock(1);
53                     i = 0;
54                     
55                 }
56 
57                 
58             }
59          }
60         
61         if (longPress.state == UIGestureRecognizerStateEnded) {
62             if (i == 1)
63             {
64                 NSLog(@"录音结束");
65                 [self.sendVoiceButton setBackgroundImage:[UIImage imageNamed:@"chat_bottom_textfield.png"] forState:UIControlStateNormal];
66                 [self.sendVoiceButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
67                 
68                 double cTime = self.audioRecorder.currentTime;
69                 if (cTime > 1)
70                 {
71                     //如果录制时间<2 不发送
72                     NSLog(@"发出去");
73                     self.urlBlock(self.audioPlayURL);
74                 }
75                 else
76                 {
77                     //删除记录的文件
78                     [self.audioRecorder deleteRecording];
79                     UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"录音时间太短！" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil];
80                     [alter show];
81                     self.cancelBlock(1);
82                     
83                 }
84                 [self.audioRecorder stop];
85                 [_timer invalidate];
86             }
87         }
88         
89         
90     }
91     
92 }
    View Code

    　　　　

    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：

     1 //录音的音量探测
 2 - (void)detectionVoice
 3 {
 4     [self.audioRecorder updateMeters];//刷新音量数据
 5     //获取音量的平均值  [recorder averagePowerForChannel:0];
 6     //音量的最大值  [recorder peakPowerForChannel:0];
 7     
 8     CGFloat lowPassResults = pow(10, (0.05 * [self.audioRecorder peakPowerForChannel:0]));
 9     
10     //把声音的音量传给调用者
11     self.volumeBlock(lowPassResults);
12 }
    View Code

    　　　　

    3.轻击输入框时，切换到系统键盘，代码如下：

     1 //轻击sendText切换键盘
 2 -(void)tapGesture:(UITapGestureRecognizer *) sender
 3 {
 4     if ([self.sendTextView.inputView isEqual:self.functionView])
 5     {
 6         self.sendTextView.inputView = nil;
 7         
 8         [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal];
 9         
10         [self.sendTextView reloadInputViews];
11     }
12     
13     if (![self.sendTextView isFirstResponder])
14     {
15         [self.sendTextView becomeFirstResponder];
16     }
17 }
    View Code

    　　　　

    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：

    1 //通过文字的多少改变toolView的高度
2 -(void)textViewDidChange:(UITextView *)textView
3 {
4     CGSize contentSize = self.sendTextView.contentSize;
5     
6     self.sizeBlock(contentSize);
7 }
    View Code

    　　　　

    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：

     1 //切换声音按键和文字输入框
 2 -(void)tapVoiceChangeButton:(UIButton *) sender
 3 {
 4 
 5     if (self.sendVoiceButton.hidden == YES)
 6     {
 7         self.sendTextView.hidden = YES;
 8         self.sendVoiceButton.hidden = NO;
 9         [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_keyboard_nor.png"] forState:UIControlStateNormal];
10         
11         if ([self.sendTextView isFirstResponder]) {
12             [self.sendTextView resignFirstResponder];
13         }
14     }
15     else
16     {
17         self.sendTextView.hidden = NO;
18         self.sendVoiceButton.hidden = YES;
19         [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal];
20         
21         if (![self.sendTextView isFirstResponder]) {
22             [self.sendTextView becomeFirstResponder];
23         }
24     }
25 }
    View Code

    　　　　

    6.点击return发送文字（通过Block回调传入到父视图上），代码如下：

     1 //发送信息（点击return）
 2 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
 3 {
 4     if ([text isEqualToString:@"
"])
 5     {
 6         
 7         //通过block回调把text的值传递到Controller中共
 8         self.textBlock(self.sendTextView.text);
 9         
10         self.sendTextView.text = @"";
11         
12         return NO;
13     }
14     return YES;
15 }
    View Code

    　　　　

    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：

    1 //发送声音按钮回调的方法
2 -(void)tapSendVoiceButton:(UIButton *) sender
3 {
4     NSLog(@"sendVoiceButton");
5     //点击发送按钮没有触发长按手势要做的事儿
6     UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"按住录音" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles: nil];
7     [alter show];
8 }
    View Code

    　　　　

    8.调用表情键盘：

     1 //变成表情键盘
 2 -(void)tapChangeKeyBoardButton:(UIButton *) sender
 3 {
 4     if ([self.sendTextView.inputView isEqual:self.functionView])
 5     {
 6         self.sendTextView.inputView = nil;
 7         
 8         [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_smile_nor.png"] forState:UIControlStateNormal];
 9         
10         [self.sendTextView reloadInputViews];
11     }
12     else
13     {
14         self.sendTextView.inputView = self.functionView;
15        
16         
17         [self.changeKeyBoardButton setImage:[UIImage imageNamed:@"chat_bottom_keyboard_nor.png"] forState:UIControlStateNormal];
18         
19         [self.sendTextView reloadInputViews];
20     }
21     
22     if (![self.sendTextView isFirstResponder])
23     {
24         [self.sendTextView becomeFirstResponder];
25     }
26     
27     if (self.sendTextView.hidden == YES) {
28         self.sendTextView.hidden = NO;
29         self.sendVoiceButton.hidden = YES;
30         [self.voiceChangeButton setImage:[UIImage imageNamed:@"chat_bottom_voice_press.png"] forState:UIControlStateNormal];
31         
32     }
33 
34 }
    View Code

    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，在以后的博客中会继续讲解，希望大家继续关注。（转载请注明出处）

     Demo地址：https://github.com/lizelu/WeChat 
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  • 原文地址：https://www.cnblogs.com/ludashi/p/3992160.html
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