局域网内端到端的聊天项目(二)
局域网内端到端的聊天项目(三)
局域网内端到端的聊天项目(四)
局域网内端到端的聊天项目(五)
局域网内端到端的聊天项目(六)
局域网内端到端的聊天项目(七)
局域网内端到端的聊天项目(八)

前言

• 最近公司项目基本不怎么忙了,有时间来写写自己的东西
• 基于以前写的局域网内文件的传输局域网内通过Socket传输文件想写一个局域网内的聊天项目

一.项目准备实现的及时通讯功能功能

• 文字/表情符的相互发送
• 图片/视频的发送预览
• 语音发送
• 当前位置的发送
• 类似QQ电话的实现
• ps:以后有其他功能在添加

二.UI部分

• 自定义键盘工具栏的实现

// 自定view ESKeyBoardToolView
#import <UIKit/UIKit.h>
/**
*  输入框最多显示多少行
*/
static NSInteger maxLines = 4;
// 输入框的高度
static CGFloat const TitleViewHeight = 44.0;

typedef NS_ENUM(NSInteger, ESKeyBoardToolView_type)
{
  ESKeyBoardToolView_typeEmoticon = 0,       // 表情按钮的点击
  ESKeyBoardToolView_typeAdd                 // 加号按钮的点击
};

@class ESKeyBoardToolView;

@protocol ESKeyBoardToolViewDelegate <NSObject>

@optional
- (void)ESKeyBoardToolViewDidClick:(UIButton *)button withType:(ESKeyBoardToolView_type)type;
/// 点击发送按钮
- (void)ESKeyBoardToolViewSendButtonDidClick:(ESKeyBoardToolView *)view message:(NSString *)message;
/// 当正在编辑文字时view的Y值变化
- (void)ESKeyBoardToolViewDidEditing:(ESKeyBoardToolView *)view  changeY:(CGFloat)yValue;
/// 结束编辑回调
- (void)ESKeyBoardToolViewDidEndEdit:(ESKeyBoardToolView *)view;
@end

@interface ESKeyBoardToolView : UIView
/// delegate
@property (nonatomic, weak) id <ESKeyBoardToolViewDelegate> delegate;
/// 输入框
@property (nonatomic, strong,readonly) UITextView *inputTextView;
/// 占位文字
@property (nonatomic, copy) NSString *placeTitle;
/// 是否需要显示右边的添加按钮
@property (nonatomic, assign) BOOL isNeedHiddenAddButton;
/// 是否正在切换表情键盘
@property (nonatomic, assign) BOOL isChangeEmoticon;
/// 键盘完全弹出所需的时间
@property (nonatomic, assign) CGFloat showTime;

- (void)exitKeyBoard;

- (void)showKeyBoard;

@end

• 监听UITextView 根据输入的文字变化高度及发送等
  主要通过获取textView的行数来计算ESKeyBoardToolView的高度同时把每次改变的值通过代理回调出去 具体实现如下

#pragma mark - textView delegate
- (void)textViewDidChange:(UITextView *)textView
{
    NSString *textStr = textView.text;
    if (textStr.length) {
        self.placeTitleLabel.hidden = YES;
    }else{
        self.placeTitleLabel.hidden = NO;
    }
    self.isEditing = YES;
    NSInteger height = ceilf([textView sizeThatFits:CGSizeMake(textView.bounds.size.width, MAXFLOAT)].height);
    NSInteger lines = height / self.textRowHeight;
    // 判断最后一个字符是否为 "\n" 发送消息
    if ([textStr hasSuffix:@"\n"]) {
        [self sendMessageLayoutWithTextLines:lines message:textStr];
        return;
    }
    if (lines > maxLines) {
        textView.scrollEnabled = YES;
        _currentLine = maxLines;
        return;
    }
    textView.scrollEnabled = NO;
    
    // 当前变化的高度
    CGFloat offsetH = self.textRowHeight;
    
    if (lines > _currentLine) {
        offsetH = (lines - _currentLine) * self.textRowHeight;
        self.hj_height = height + 10;
        self.y -= offsetH;
    }else if (lines < _currentLine){
        // 文字删除减少的时候 减少的高度 上一次的行数 - 现在的行数
        offsetH = (_currentLine - lines) * self.textRowHeight;
        self.hj_height -= offsetH;
        self.y += offsetH;
    }
    self.nowHeight = self.hj_height;
    
    if ([self.delegate respondsToSelector:@selector(ESKeyBoardToolViewDidEditing:changeY:)] && _currentLine != lines) {
        [self.delegate ESKeyBoardToolViewDidEditing:self changeY:lines > _currentLine ? (-offsetH) : (offsetH)];
    }
    _currentLine = lines;
    
}

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"\n"])
    {
        NSInteger height = ceilf([textView sizeThatFits:CGSizeMake(textView.bounds.size.width, MAXFLOAT)].height);
        NSInteger lines = height / self.textRowHeight;
        [self sendMessageLayoutWithTextLines:lines message:textView.text];
    }
    return YES;
}

#pragma mark - method
// 消息发送后重新布局
- (void)sendMessageLayoutWithTextLines:(NSInteger)lines message:(NSString *)message{
    self.hj_height = TitleViewHeight;
    self.nowHeight = TitleViewHeight;
    self.y += self.textRowHeight * (lines - 1);
    self.currentLine = 1;
    self.isEditing = NO;
    self.inputTextView.text = nil;
    self.inputTextView.scrollEnabled = NO;
    [self.inputTextView resignFirstResponder];
    
    if ([self.delegate respondsToSelector:@selector(ESKeyBoardToolViewSendButtonDidClick: message:)]) {
        [self.delegate ESKeyBoardToolViewSendButtonDidClick:self message:message];
    }
}

效果图: IMG_2407.GIF

• 表情键盘的实现
  

  1:对应表情的plist文件 本地的表情图标 Snip20171124_6.png
  Snip20171124_5.png Snip20171124_4.png

// 表情内容view EmoticonContentView
#import <UIKit/UIKit.h>

// 一页中最多3行
#define ESEmotionMaxRows 3
// 一行中最多7列
#define ESEmotionMaxCols 6
// 每一页的表情个数
#define ESEmotionPageSize ((ESEmotionMaxRows * ESEmotionMaxCols) - 1)

@class EmoticonContentView;
@protocol EmoticonContentViewDelegate <NSObject>
@optional
// 点击表情的回调
- (void)emoticonContentInsetEmoticon:(EmoticonContentView *)view insetMessage:(NSString *)message;
// 删除表情的回调
- (void)emoticonContentDeleteEmoticon:(EmoticonContentView *)view;
@end

@interface EmoticonContentView : UIView
/// 这一页显示的表情（里面都是ESEmotion模型
@property (nonatomic, strong) NSArray *emotions;
/// delegate
@property (nonatomic, weak) id <EmoticonContentViewDelegate> delegate;
@end

// 外界通过 emotions 数组来赋值 最后一个是删除按钮
- (void)setEmotions:(NSArray *)emotions
{
    _emotions = emotions;
    NSUInteger count = emotions.count;
    ESEmotionModel *emotion = nil;
    for (int i = 0; i<count; i++) {
        EmoticonButton *btn = [[EmoticonButton alloc] init];
        btn.imageView.contentMode = UIViewContentModeScaleAspectFit;
        btn.tag = i;
        emotion = emotions[i];
        UIImage *image = [UIImage imageNamed:emotion.png];
        [btn setImage:image forState:UIControlStateNormal];
        btn.titleLabel.font = [UIFont systemFontOfSize:32];
        [btn addTarget:self action:@selector(emoticonButtonClik:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:btn];
    }
   // 最后一个加上删除按钮
    [self addSubview:self.deleteButton];
}

// 布局对应的表情按钮 及删除按钮
- (void)layoutSubviews
{
    [super layoutSubviews];
    // 内边距(四周)
    CGFloat inset = 15;
    NSUInteger count = self.emotions.count;
    CGFloat btnW = (self.hj_width - 2 * inset) / ESEmotionMaxCols;
    CGFloat btnH = (self.hj_height - inset) / ESEmotionMaxRows;
    for (int i = 0; i<count; i++) {
        UIButton *btn = self.subviews[i];
        btn.hj_width = btnW;
        btn.hj_height = btnH;
        btn.x = inset + (i % ESEmotionMaxCols) * btnW;
        btn.y = inset + (i / ESEmotionMaxCols) * btnH;
    }
    CGFloat deleteX = self.hj_width - inset - btnW;
    CGFloat deleteY = self.hj_height - btnH;
    self.deleteButton.frame = CGRectMake(deleteX, deleteY, btnW, btnH);
}

在textView中加入内容方法

[self.inputTextView insertText:message];

textView删除内容方法

[self.inputTextView deleteBackward];