带大家一步一步的封装一个聊天键盘

众所周知，一个聊天键盘，肯定要有表情，发送图片啊，语音啊，视频什么的，我封装的就只有表情（是emoji），其他几个扩展的，放在一个view里，等以后在去添加功能

好吧，我们开始，首先要思考封装一个这样的聊天键盘，我们需要什么，肯定需要一个表情按钮，UItextView，还有一个扩展的view，而UITextView可能需要有占位文字，所以我们首先自己定制有占位文字的UITextView

继承UITextView创建一个自定义的UITextView，我的叫BCTextView

http://pan.baidu.com/s/1c1berb6 这是表情和图片的下载地址

BCTextView.h文件

#import <UIKit/UIKit.h>

@interface BCTextView : UITextView
@property (nonatomic, retain) NSString *placeholder;
@property (nonatomic, retain) UIColor *placeholderColor;
@end

BCTextView.m文件

#import "BCTextView.h"

@interface BCTextView ()

@end

@implementation BCTextView

- (instancetype)initWithFrame:(CGRect)frame
{
    
    self = [super initWithFrame:frame];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChanged:)
                                                     name:UITextViewTextDidChangeNotification
                                                   object:nil];
        self.autoresizesSubviews = NO;
        //默认字和颜色
        self.placeholder = @"";
        self.placeholderColor = [UIColor lightGrayColor];
        
    }
    return self;
}
- (void)drawRect:(CGRect)rect
{
    //内容为空时才绘制placeholder
    if ([self.text isEqualToString:@""]) {
        CGRect placeholderRect;
        placeholderRect.origin.y = 8;
        placeholderRect.size.height = CGRectGetHeight(self.frame)-8;

        placeholderRect.origin.x = 5;
        placeholderRect.size.width = CGRectGetWidth(self.frame)-5;

        [self.placeholderColor set];
        [self.placeholder drawInRect:placeholderRect
                            withFont:self.font
                       lineBreakMode:NSLineBreakByWordWrapping
                           alignment:NSTextAlignmentLeft];
    }
}
- (void)textChanged:(NSNotification *)not
{
    [self setNeedsDisplay];
}

- (void)setText:(NSString *)text
{
    [super setText:text];
    [self setNeedsDisplay];
}

准备工作完成，现在我们来自定义键盘，继承UIView新建一个类

我们一步一步的来，我们的布局是左边表情按钮，中间textView，右边扩展按钮

先给大家看看宏定义吧

#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)


#define kBCTextViewHeight 36 /**< 底部textView的高度 */
#define kHorizontalPadding 8 /**< 横向间隔 */
#define kVerticalPadding 5 /**< 纵向间隔 */

Key.m文件

#import "BCKeyBoard.h"
#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)


#define kBCTextViewHeight 36 /**< 底部textView的高度 */
#define kHorizontalPadding 8 /**< 横向间隔 */
#define kVerticalPadding 5 /**< 纵向间隔 */
@interface BCKeyBoard() <UITextViewDelegate>
@property (nonatomic,strong)UIButton *faceBtn;
@property (nonatomic,strong)UIButton *moreBtn;
@property (nonatomic,strong)BCTextView  *textView;
@property (nonatomic,strong)UIImageView *backgroundImageView;
@end

@implementation BCKeyBoard

- (instancetype)initWithFrame:(CGRect)frame
{
    if (frame.size.height < (kVerticalPadding * 2 + kBCTextViewHeight)) {
        frame.size.height = kVerticalPadding * 2 + kBCTextViewHeight;
    }
    self = [super initWithFrame:frame];
    if (self) {
        [self createUI];
    }
    return self;
}

- (void)setFrame:(CGRect)frame
{
    if (frame.size.height < (kVerticalPadding * 2 + kBCTextViewHeight)) {
        frame.size.height = kVerticalPadding * 2 + kBCTextViewHeight;
    }
    [super setFrame:frame];
}

- (void)createUI{
    
    self.backgroundImageView = [[UIImageView alloc] initWithFrame:self.bounds];
    self.backgroundImageView.userInteractionEnabled = YES;
    self.backgroundImageView.image = [[UIImage imageNamed:@"messageToolbarBg"] stretchableImageWithLeftCapWidth:0.5 topCapHeight:10];
    
    
    //表情按钮
    self.faceBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.faceBtn.frame = CGRectMake(kHorizontalPadding,kHorizontalPadding, 30, 30);
    [self.faceBtn addTarget:self action:@selector(willShowFaceView:) forControlEvents:UIControlEventTouchUpInside];
    [self.faceBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_face"] forState:UIControlStateNormal];
    [self.faceBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_keyboard"] forState:UIControlStateSelected];
    [self addSubview:self.faceBtn];
    
    //文本
    self.textView = [[BCTextView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.faceBtn.frame)+kHorizontalPadding, kHorizontalPadding, self.bounds.size.width - 4*kHorizontalPadding - 30*2, 30)];
    self.textView.placeholderColor = [UIColor lightGrayColor];
    self.textView.returnKeyType = UIReturnKeySend;
    self.textView.scrollEnabled = NO;
    self.textView.backgroundColor = [UIColor clearColor];
    self.textView.layer.borderColor = [UIColor colorWithWhite:0.8f alpha:1.0f].CGColor;
    self.textView.layer.borderWidth = 0.65f;
    self.textView.layer.cornerRadius = 6.0f;
    self.textView.delegate = self;
    
    //更多按钮
    self.moreBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.moreBtn.frame = CGRectMake(CGRectGetMaxX(self.textView.frame)+kHorizontalPadding,kHorizontalPadding,30,30);
    [self.moreBtn addTarget:self action:@selector(willShowMoreView:) forControlEvents:UIControlEventTouchUpInside];
    [self.moreBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_more"] forState:UIControlStateNormal];
    [self.moreBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_keyboard"] forState:UIControlStateSelected];
    
    [self addSubview:self.backgroundImageView];
    [self.backgroundImageView addSubview:self.textView];
    [self.backgroundImageView addSubview:self.faceBtn];
    [self.backgroundImageView addSubview:self.moreBtn];
}
- (void)willShowFaceView:(UIButton *)btn{

}
- (void)willShowMoreView:(UIButton *)btn{
    
}

在ViewController.m中

#import "ViewController.h"
#import "BCKeyBoard.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    BCKeyBoard *bc = [[BCKeyBoard alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height - 46, [UIScreen mainScreen].bounds.size.width,46)];
    bc.backgroundColor = [UIColor clearColor];
    [self.view addSubview:bc];

}

运行效果

我们还要根据键盘弹起的高度，将自定义的view随之弹起，用的是通知，根据键盘弹起的高度，去改变自定义view的高度，使之始终在键盘的上面

#import "BCKeyBoard.h"
#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)


#define kBCTextViewHeight 36 /**< 底部textView的高度 */
#define kHorizontalPadding 8 /**< 横向间隔 */
#define kVerticalPadding 5 /**< 纵向间隔 */
@interface BCKeyBoard() <UITextViewDelegate>
@property (nonatomic,strong)UIButton *faceBtn;
@property (nonatomic,strong)UIButton *moreBtn;
@property (nonatomic,strong)BCTextView  *textView;
@property (nonatomic,strong)UIImageView *backgroundImageView;
@end

@implementation BCKeyBoard

- (instancetype)initWithFrame:(CGRect)frame
{
    if (frame.size.height < (kVerticalPadding * 2 + kBCTextViewHeight)) {
        frame.size.height = kVerticalPadding * 2 + kBCTextViewHeight;
    }
    self = [super initWithFrame:frame];
    if (self) {
        [self createUI];
    }
    return self;
}

- (void)setFrame:(CGRect)frame
{
    if (frame.size.height < (kVerticalPadding * 2 + kBCTextViewHeight)) {
        frame.size.height = kVerticalPadding * 2 + kBCTextViewHeight;
    }
    [super setFrame:frame];
}

- (void)createUI{
    
    //键盘高度改变是调用
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
    
    self.backgroundImageView = [[UIImageView alloc] initWithFrame:self.bounds];
    self.backgroundImageView.userInteractionEnabled = YES;
    self.backgroundImageView.image = [[UIImage imageNamed:@"messageToolbarBg"] stretchableImageWithLeftCapWidth:0.5 topCapHeight:10];
    
    
    //表情按钮
    self.faceBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.faceBtn.frame = CGRectMake(kHorizontalPadding,kHorizontalPadding, 30, 30);
    [self.faceBtn addTarget:self action:@selector(willShowFaceView:) forControlEvents:UIControlEventTouchUpInside];
    [self.faceBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_face"] forState:UIControlStateNormal];
    [self.faceBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_keyboard"] forState:UIControlStateSelected];
    [self addSubview:self.faceBtn];
    
    //文本
    self.textView = [[BCTextView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.faceBtn.frame)+kHorizontalPadding, kHorizontalPadding, self.bounds.size.width - 4*kHorizontalPadding - 30*2, 30)];
    self.textView.placeholderColor = [UIColor lightGrayColor];
    self.textView.returnKeyType = UIReturnKeySend;
    self.textView.scrollEnabled = NO;
    self.textView.backgroundColor = [UIColor clearColor];
    self.textView.layer.borderColor = [UIColor colorWithWhite:0.8f alpha:1.0f].CGColor;
    self.textView.layer.borderWidth = 0.65f;
    self.textView.layer.cornerRadius = 6.0f;
    self.textView.delegate = self;
    
    //更多按钮
    self.moreBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.moreBtn.frame = CGRectMake(CGRectGetMaxX(self.textView.frame)+kHorizontalPadding,kHorizontalPadding,30,30);
    [self.moreBtn addTarget:self action:@selector(willShowMoreView:) forControlEvents:UIControlEventTouchUpInside];
    [self.moreBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_more"] forState:UIControlStateNormal];
    [self.moreBtn setBackgroundImage:[UIImage imageNamed:@"chatBar_keyboard"] forState:UIControlStateSelected];
    
    [self addSubview:self.backgroundImageView];
    [self.backgroundImageView addSubview:self.textView];
    [self.backgroundImageView addSubview:self.faceBtn];
    [self.backgroundImageView addSubview:self.moreBtn];
}
- (void)keyboardWillChangeFrame:(NSNotification *)notification{
    NSDictionary *userInfo = notification.userInfo;
    CGRect endFrame = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationCurve curve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    //动画
    void(^animations)() = ^{
        CGRect frame = self.frame;
        frame.origin.y = endFrame.origin.y - self.bounds.size.height;
        self.frame = frame;
    };
    void(^completion)(BOOL) = ^(BOOL finished){
    };
    [UIView animateWithDuration:duration delay:0.0f options:(curve << 16 | UIViewAnimationOptionBeginFromCurrentState) animations:animations completion:completion];
}
- (void)willShowFaceView:(UIButton *)btn{

}
- (void)willShowMoreView:(UIButton *)btn{
    
}
@end

运行效果

是不是很棒…..，接下来，我们写表情按钮点击事件，表情按钮点击的时候弹出的肯定是表情键盘，自定义View的高度肯定也要变化，点击更多按钮时也是一样，所以，我们先写个高度变化的方法

其实底部的view，我们可以用一个activeView表示底部到底是什么View，方法的话是传入一个View，就直接能改变自定义View的高度来适应底部的activeView，多加的两个方法，记得要加个属性，就是activeView，类型是UIView；

- (void)willShowBottomView:(UIView *)bottomView
{
    if (![self.activeView isEqual:bottomView]) {
        CGFloat bottomHeight = bottomView ? bottomView.frame.size.height : 0;
        [self willShowBottomHeight:bottomHeight];
        
        if (bottomView) {
            CGRect rect = bottomView.frame;
            rect.origin.y = CGRectGetMaxY(self.backgroundImageView.frame);
            bottomView.frame = rect;
            [self addSubview:bottomView];
        }
        if (self.activeView) {
            [self.activeView removeFromSuperview];
        }
        self.activeView = bottomView;
    }
}
- (void)willShowBottomHeight:(CGFloat)bottomHeight
{
    CGRect fromFrame = self.frame;
    CGFloat toHeight = self.backgroundImageView.frame.size.height + bottomHeight;
    CGRect toFrame = CGRectMake(fromFrame.origin.x, fromFrame.origin.y + (fromFrame.size.height - toHeight), fromFrame.size.width, toHeight);
    self.frame = toFrame;
}

接下来，我们创建表情键盘，这个是我网上找的（我不会写表情键盘…），自己看git里面的FaceView的文件夹，顺便试试上面的改变frame的方法

#import "BCKeyBoard.h"

原文链接：https://blog.csdn.net/lc_1581835288/article/details/50544476

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