iOS 一步步封装一个微信键盘

效果图：

前言：要做成上面的效果图，需要我们自定义键盘。但是上面的键盘一个view 就可以搞定，可是下面的表情或者扩展怎么处理呢，有人说用UITextview的inputView 处理，可是在使用inpuview的时候，处理表情键盘或者扩展键盘，UITextview会一直成为响应者，光标会一直存在，所以我们把辅助键盘放在 下面。

如图：

大概思路就是 点击键盘上UITextview的时候，让UITextview成为第一响应者，点击语音按钮，表情按钮，more 按钮，让UITextview取消第一响应者，然后把辅助键盘视图放置在键盘的下方。

1、 首先，我们自定义一个view，ChatBox。设置几种 键盘状态

typedef NS_ENUM(NSInteger, LXChatBoxStatus) {
    LXChatBoxStatusNothing,     // 默认状态
    LXChatBoxStatusShowVoLXe,   // 录音状态
    LXChatBoxStatusShowFace,    // 输入表情状态
    LXChatBoxStatusShowMore,    // 显示“更多”页面状态
    LXChatBoxStatusShowKeyboard,// 正常键盘
    LXChatBoxStatusShowVideo    // 录制视频
};

@property(nonatomic,assign)LXChatBoxStatus status;

在点击按钮或者 编辑UITextview的时候设置状态：

#pragma mark---textview--代理方法---
-(void)textViewDidBeginEditing:(UITextView *)textView{
    if (self.status != LXChatBoxStatusShowKeyboard) {
        self.status = LXChatBoxStatusShowKeyboard;

    }
        [self changeFrame:ceilf([textView sizeThatFits:textView.frame.size].height)];
}

#pragma mark---Event Responds---

-(void)voiceButtonDown:(UIButton *)button{
    
    button.selected = !button.selected;
    if (button.selected) {
        self.status = LXChatBoxStatusShowKeyboard;
    }else{
        self.status = LXChatBoxStatusShowVoLXe;
    }
    
}
-(void)faceButtonDown:(UIButton *)button{
    button.selected = !button.selected;
    if (button.selected) {
        self.status = LXChatBoxStatusShowFace;
    }else{
        self.status = LXChatBoxStatusShowKeyboard;
    }
   
    
}
-(void)moreButtonDown:(UIButton *)button{
    button.selected = !button.selected;
    if (button.selected) {
        self.status = LXChatBoxStatusShowMore;
    }else{
        self.status = LXChatBoxStatusShowKeyboard;
    }
}

通过设置键盘状态，在设置状态里对键盘视图的隐藏做一些处理。调整高度

-(void)setStatus:(LXChatBoxStatus)status{
    if (_status == status) {
        return;
    }
    _status = status;
    switch (_status) {
        case LXChatBoxStatusNothing:
        {
            self.voiceButton.selected = YES;
            self.faceView.hidden = self.moreView.hidden = YES;
            [self.textView resignFirstResponder];
            [UIView animateWithDuration:0.3 animations:^{
                self.frame = CGRectMake(0, KScreenH - self.textView.height - 2 *BOXTEXTViewSPACE, KScreenW, self.textView.height + 2 *BOXTEXTViewSPACE);

            }];
        }
            
           
            break;
        case LXChatBoxStatusShowKeyboard:
        {
            self.faceView.hidden = self.moreView.hidden = YES;

            self.voiceButton.selected = YES;
            self.textView.hidden = NO;
            self.talkButton.hidden = YES;
            self.faceButton.selected= NO;
            
            [UIView animateWithDuration:0.3 animations:^{
                self.frame = CGRectMake(0, self.y, KScreenW, self.textView.height + 2 *BOXTEXTViewSPACE);
                
            }];
             [self.textView becomeFirstResponder];
        }
        break;
        case LXChatBoxStatusShowVoLXe:
        {
            self.faceView.hidden = self.moreView.hidden = YES;

            [self.textView resignFirstResponder];
            self.voiceButton.selected = NO;
            self.talkButton.hidden = NO;
            self.textView.hidden = YES;
            [UIView animateWithDuration:0.3 animations:^{
                [self voiceResetFrame];
            }];

        }
            
            break;
        case LXChatBoxStatusShowFace:
        {
            if (self.textView.isFirstResponder) {
                [self.textView resignFirstResponder];
            }
            

            self.voiceButton.selected = YES;
            self.moreView.hidden = YES;
            self.faceView.hidden = NO;
            
            self.height = self.textView.height+2 *BOXTEXTViewSPACE + BOXOTHERH;
            self.y = KScreenH - self.height;
            self.bottomCotainer.y = self.textView.height + 2 *BOXTEXTViewSPACE;

        }
            
            break;
        case LXChatBoxStatusShowMore:
        {
            

            if (self.textView.isFirstResponder) {
                [self.textView resignFirstResponder];
            }
            
            self.voiceButton.selected = YES;
            self.moreView.hidden = NO;
            self.faceView.hidden = YES;

            self.height = self.textView.height+2 *BOXTEXTViewSPACE + BOXOTHERH;
            self.y = KScreenH - self.height;
            self.bottomCotainer.y = self.textView.height + 2 *BOXTEXTViewSPACE;
        }
        default:
            break;
    }
    if ([self.delegate respondsToSelector:@selector(changeStatusChat:)]) {
        [self.delegate changeStatusChat:self.y];
    }
}

2、但是，只是在状态里设置键盘高度是不够的，如果我们点击UITextview，执行顺序是这样的：

（1） -(void)keyboardWillChangeFrame:(NSNotification *)notification
（2） -(void)textViewDidBeginEditing:(UITextView *)textView

所以说，如果没有点击其他按钮（声音，表情，更多），点击了UITextview，在-(void)textViewDidBeginEditing:(UITextView *)textView设置键盘状态是没有用的，所以要键盘通知里做处理

-(void)keyboardWillChangeFrame:(NSNotification *)notification{
    
   
    //因为在 切换视图的时候，点击了表情按钮，或者更多按钮，输入框是，键盘弹出在textViewDidBeginEditing 这个方法调用之前就会调用，
//        self.height = self.textView.height + 2 *BOXTEXTViewSPACE;
    if (self.status == LXChatBoxStatusShowMore ||self.status == LXChatBoxStatusShowFace) {
        return;
    }

3、 针对键盘高度改变设置代理接口

@property(nonatomic,weak)id<LXChatBoxDelegate>delegate;

在键盘高度改变的地方设置代理（键盘状态改变得地方），（键盘Textview文字 改变的地方）（键盘通知），

 if ([self.delegate respondsToSelector:@selector(changeStatusChat:)]) {
        [self.delegate changeStatusChat:self.y];
    }

关于 接口：@property(nonatomic,assign)BOOL isDisappear;//为了在侧滑返回的时候自定义键盘与 键盘一体，可以参考文章：一体键盘
demo 地址：仿微信键盘