TableCell自适应输入框

纯代码实现cell布局，利用约束实现自适应布局。
下面展示的为实现自适应输入框的部分关键代码

效果.png

初始化cell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
   self=[super initWithStyle:style reuseIdentifier:reuseIdentifier];
   if (self) {
       [self updateViewConstraint];
   }
   return self;
}

设置布局的约束条件

- (void)setupViewConstraint {
    [self.labelBeizhu mas_makeConstraints:^(MASConstraintMaker *make) {
        make.leading.mas_equalTo(self.labelPriceTip.mas_leading);
        make.top.mas_equalTo(self);
        make.height.mas_equalTo(@(44));
        make.width.mas_equalTo(@(50));
    }];
    
    [self.textViewBeiZhu mas_makeConstraints:^(MASConstraintMaker *make) {
        make.leading.mas_equalTo(self.labelBeizhu.mas_trailing).offset(10);
        make.top.mas_equalTo(self).offset(6);
        make.height.mas_equalTo(@(32));
        make.trailing.mas_equalTo(self).offset(-10);
        make.bottom.mas_equalTo(self).priorityLow();
    }];
    
}

textView的属性设置

- (UITextView *)textViewBeiZhu {
    if (_textViewBeiZhu == nil) {
        UITextView *textView = [[UITextView alloc] init];
        textView.font = [UIFont systemFontOfSize:15];
        textView.backgroundColor = [UIColor whiteColor];
        textView.showsVerticalScrollIndicator = NO;
        textView.scrollEnabled=NO;
        textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
        _textViewBeiZhu = textView;
        [self addSubview:_textViewBeiZhu];
    }
    return _textViewBeiZhu;
}

在textViewDidChange中实时计算textview的高度并更新

- (void)textViewDidChange:(UITextView *)textView {
//计算textview高度
    CGRect frame = textView.frame;
    CGSize constraintSize = CGSizeMake(frame.size.width, MAXFLOAT);
    CGSize size = [textView sizeThatFits:constraintSize];
    [self.textViewBeiZhu mas_updateConstraints:^(MASConstraintMaker *make) {
//更新height
        make.height.mas_equalTo(@(size.height));
    }];
// 重点
    [self.mtableView beginUpdates];
    [self.mtableView endUpdates];
}