设置UITextView根据内容动态设置高度的简单方法，类似微信发朋友圈时的文本输入效果实现😁

设置UITextView根据内容动态设置高度的简单方法

今天给大家介绍的是设置UITextView根据内容动态设置高度，我用的是SDLayout的布局方式，方法很简单可以根据自己的布局方式做修改，直接上代码：

- (void)textViewTextDidChangeNotiAction:(NSNotification *)obj{
     
    UITextView *textView = (UITextView *)obj.object;
    if(textView == self.contentTextView){
         
        //获得textView的初始尺寸
        CGFloat width = CGRectGetWidth(self.contentTextView.frame);
        CGFloat height = CGRectGetHeight(self.contentTextView.frame);
        //获取当前内容下的textView的尺寸
        CGSize newSize = [self.contentTextView sizeThatFits:CGSizeMake(width,MAXFLOAT)];
         
        CGRect newFrame = self.contentTextView.frame;
         
       // newFrame.size = CGSizeMake(fmax(width, newSize.width), fmax(height, newSize.height));
        newFrame.size = CGSizeMake(newSize.width, newSize.height);
         
        LYLog(@"新高度：%f",newFrame.size.height);
         
        //self.contentTextView.frame = newFrame;
         
        self.contentTextView.sd_resetLayout
        .topSpaceToView(self, 10.f)
        .leftSpaceToView(self, 15.f)
        .rightSpaceToView(self, 15.f)
        .heightIs(newFrame.size.height);
         
        self.textNumLabel.sd_resetLayout
        .topSpaceToView(self.contentTextView,5.f)
        .rightSpaceToView(self, 15.f)
        .widthIs(100.f)
        .heightIs(20.f);
        [self.contentTextView updateLayout];
        self.inputText = self.contentTextView.text;
        if([self.contentTextView.text isEqualToString:@"这一刻的想法"]){
            self.inputText = @"";
        }else {
             
            if(self.contentTextView.text.length > 500){
                [self.contentTextView endEditing:YES];
                 
                [MBProgressHUD showText:@"内容不能超过500个字" toView:nil];
                 
                self.inputText = [self.contentTextView.text substringToIndex:500];
                self.contentTextView.text = self.inputText;
            }
        }
         
        self.textNumLabel.text = [NSString stringWithFormat:@"%lu/%lu",(unsigned long)self.inputText.length,500 - self.inputText.length];
         
        [self updateInputText];
         
        LYLog(@"输入的内容：%@",self.contentTextView.text);
    }
     
    [self setupAutoHeightWithBottomView:self.textNumLabel bottomMargin:10.f];
}