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前言:这个输入框基本可以解决textView使用过程中的大部分问题

1.调用,用起来也算方便

HYInputTextView *input = [[HYInputTextView alloc] initWithTitle:@"输入框测试" content:self.centerTextView.text andMaxCount:200 saveBlock:^(NSString * _Nonnull inputContent) {
        self.centerTextView.text = inputContent;
    }];

2.字数限制

- (void)setMax:(int)max {
    _max = max;
    _countLabel.text = [self countForContentString:self.content];
}

- (void)setContent:(NSString *)content {
    _content = content;
    self.inputView.text = content;
    _countLabel.text = [self countForContentString:content];
    [self updateSelfOfTextViewSize];
}

- (NSString *)countForContentString:(NSString *)content {
    if (!content) content = @"";
    return [NSString stringWithFormat:@"(%li/%i)",content.length,self.max];
}

- (void)textViewDidChange:(UITextView *)textView {
#pragma mark-----------注意次序
    // 文字计算
    UITextRange *selectedRange = [textView markedTextRange];
    //获取高亮部分
    UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];
    //如果在变化中是高亮部分在变，就不要计算字符了
    if (selectedRange && pos) {
        return;
    }         
    // 去掉英文没满一行就换行
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
    NSDictionary *attributes = @{NSParagraphStyleAttributeName:paragraphStyle,NSFontAttributeName:[UIFont systemFontOfSize:INPUT_FONT]};
    textView.attributedText = [[NSAttributedString alloc]initWithString:textView.text attributes:attributes];
    
    if ((unsigned long)textView.text.length > self.max) {
        // 对超出的部分进行剪切
        textView.text = [textView.text substringToIndex:self.max];
    } else {
        //动态调整textView的高度
        [self updateSelfOfTextViewSize];
    }
    self.countLabel.text = [self countForContentString:textView.text];
}

3.动态调整textView的高度

- (void)updateSelfOfTextViewSize {
    //* TextView 大小*/
    CGRect inputF = self.inputView.frame;
    CGSize maxSize = CGSizeMake(inputF.size.width, CGFLOAT_MAX);
    CGSize newSize = [self.inputView sizeThatFits:maxSize];
    CGFloat maxHeight = MIN(INPUT_MAX_HEIGHT, newSize.height);
    if (inputF.size.height ==maxHeight) return;
    [self changeFrameForTextHeight:maxHeight];
    //让text的内容平滑居中
    [self.inputView scrollRangeToVisible:NSMakeRange(0, 0)];
}

- (void)changeFrameForTextHeight:(CGFloat)height {
    CGRect inputF = self.inputView.frame;
    inputF.size.height = height;
    //改变自己的高度
    CGRect rect = self.frame;
    rect.size.height = self.oldHeight -TEXTVIEW_ACTION_HEIGHT + height;
    rect.origin.y = rect.origin.y-(rect.size.height-self.frame.size.height);
    // 改变backgrund高度
    CGRect backF = self.centerBackgrundView.frame;
    backF.size.height = rect.size.height -BACKGRUND_HEIGHT;
    // 改变Button高度
    CGRect buttonF = self.sureButton.frame;
    buttonF.origin.y = CGRectGetMaxY(inputF) + INPUTVIEW_TOP;
    [UIView animateWithDuration:.3 animations:^{
        self.inputView.frame = inputF;
        self.sureButton.frame = buttonF;
        self.centerBackgrundView.frame = backF;
        self.frame = rect;
    }];
}

4.键盘弹出相关

#pragma mark - 键盘事件监听
- (void)initKeyboardObserver
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
}

- (void)keyboardWillShow:(NSNotification*)notification {
    NSLog(@"键盘即将弹出");
    NSValue* keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [keyboardBoundsValue CGRectValue];
    
    NSNumber* keyboardAnimationDur = [[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    float animationDur = [keyboardAnimationDur floatValue];
    
    _keyboardShowTime++;
    // 第三方输入法有bug,第一次弹出没有keyboardRect
    if (animationDur > 0.0f && keyboardRect.size.height == 0) {
        _isThirdPartKeyboard = YES;
        NSLog(@"第三方");
    }
    // 第三方输入法,有动画间隔时,没有高度
    if (_isThirdPartKeyboard) {
        // 第三次调用keyboardWillShow的时候 键盘完全展开
        if (_keyboardShowTime == 3 && keyboardRect.size.height != 0 && keyboardRect.origin.y != 0) {
            _keyboardFrame = keyboardRect;
            //Animate change
            [self showKeyBoardAnimation];
        }
        if (animationDur > 0.0) {
            _keyboardAnimateDur = animationDur;
        }
    } else {
        if (animationDur > 0.0) {
            _keyboardFrame = keyboardRect;
            _keyboardAnimateDur = animationDur;
            [self showKeyBoardAnimation];
        }
    }
}

- (void)keyboardDidShow:(NSNotification*)notification {
    _isKeyboardShow = YES;
    if (_keyboardAnimateDur ==0) {
        NSValue* keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
        self.keyboardFrame = [keyboardBoundsValue CGRectValue];
        _keyboardAnimateDur = 0.3f;
        [self showKeyBoardAnimation];
    }
}

- (void)keyboardWillHide:(NSNotification*)notification {
    NSNumber* keyboardAnimationDur = [[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    float animationDur = [keyboardAnimationDur floatValue];
 
    _isThirdPartKeyboard = NO;
    _keyboardShowTime = 0;
    
    if (animationDur > 0.0){
        [_overView removeFromSuperview];
        CGRect rect = self.frame;
        rect.origin.y = MAINSCREEN_HEIGHT;
        [UIView animateWithDuration:_keyboardAnimateDur animations:^{
            self.frame = rect;
//            [self layoutIfNeeded];
//            [self layoutSubviews];
        } completion:^(BOOL finished) {
            [self removeFromSuperview];
        }];
    }
}

- (void)keyboardDidHide:(NSNotification*)notification {
    _isKeyboardShow = NO;
}

// 弹出视图
- (void)showKeyBoardAnimation {
    CGRect rect = self.frame;
    rect.origin.y = MAINSCREEN_HEIGHT- self.keyboardFrame.size.height-rect.size.height;
    [UIView animateWithDuration:_keyboardAnimateDur animations:^{
        self.frame= rect;
//        [self layoutIfNeeded];
//        [self layoutSubviews];
    }];
}