为什么UITextView高度只能在滚动上变为动态？

-2

我有一个UITextView在UITableCell里面，我想根据它的大小使其高度动态化。所以我使用了下面的代码。为什么UITextView高度只能在滚动上变为动态？

- (void)textViewDidChange:(UITextView *)textView 
{ 
    CGFloat fixedWidth = textView.frame.size.width; 
    CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)]; 
    CGRect newFrame = textView.frame; 
    newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height); 
    textView.frame = newFrame; 
}

此代码工作得很好，但问题是，只有当我对UITableView负载否则滚动它不会成为动态height.Although方法被称为twice.Please告诉我为什么这个happend我的UITextView的高度变成动态的？

编辑：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSLog(@"cell for row called %d",(int)[arr_post count]); 
    //define variables here 
    NSMutableAttributedString *mutableAttributeStr; 
    NSAttributedString *attributeStr; 
    static NSString *CellIdentifier = @"homeCell"; 
    HomeCell *cell = [self.table_view 
         dequeueReusableCellWithIdentifier:CellIdentifier 
         forIndexPath:indexPath]; 
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone]; 


    //get the post data 
    Post *user_post=[arr_post objectAtIndex:indexPath.row]; 

    //set the button tags 
    cell.btn_like.tag=indexPath.row; 
    cell.btn_comment.tag=indexPath.row; 
    cell.btn_fav.tag=indexPath.row; 
    cell.btn_con.tag=indexPath.row; 
    cell.btn_book.tag=indexPath.row; 

    //add info to buttons 
    cell.btn_like.selected=user_post.isPostLiked; 
    cell.btn_comment.selected=user_post.isPostCommented; 
    cell.btn_fav.selected=user_post.isPostFavourite; 
    cell.btn_con.selected=user_post.isPostCondolence; 
    cell.btn_book.selected=user_post.isPostBookmarked; 
    //add text view path 

    //add user info 
    cell.label_name.text=user_post.username; 
    [cell.img_profile setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.user_profileImage]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]]; 

    //add location 
    if([user_post.location isEqualToString:@"Not Available"]) 
    { 
     [cell.img_icon_location setHidden:true]; 
     [cell.label_location setHidden:true]; 
    } 
    else 
    { 
     cell.label_location.text=user_post.location; 

    } 
    //ad post info 
    cell.tv_post.text=user_post.post_description; 
    cell.tv_post.font = [UIFont fontWithName:user_post.font_family size:[user_post.font_size floatValue]]; 
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 
    NSDate *date = [formatter dateFromString:user_post.modification_date]; 
    if([user_post.post_image isEqualToString:@"none"] && [user_post.post_video isEqualToString:@"none"]) 
    { 

    } 
    else 
    { 
     UIBezierPath * imgRect = [UIBezierPath bezierPathWithRect:CGRectMake(0, 10, 100, 100)]; 
     cell.tv_post.textContainer.exclusionPaths = @[imgRect]; 
     UIImageView *tv_image =[[UIImageView alloc]initWithFrame:CGRectMake(0, 10, 100, 100)]; 
     [tv_image setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.post_video_thumbnail]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]]; 
     [cell.tv_post addSubview:tv_image]; 

    } 
    //make textview height dynamic 
    cell.tv_post.scrollEnabled=NO; 
    [self textViewDidChange:cell.tv_post]; 


    NSLog(@"textview height is %f",cell.tv_post.frame.size.height); 
    NSLog(@"main view height is %f",cell.view_tvContainer.frame.size.height); 
    //set the border of uiview 
    cell.view_tvContainer.layer.borderColor = [UIColor blackColor].CGColor; 
    cell.view_tvContainer.layer.borderWidth = 2.0f; 


    //set the like count 
    NSString *first_like_user=user_post.recent_like_name; 
    int count=(int)[first_like_user length]; 
    int like_count=[user_post.like_count intValue]; 

    //chek if tehre are any likes on the post 
    NSLog(@"post id is %@",user_post.id); 
    NSLog(@"recent like name is %@",user_post.recent_like_name); 
    NSLog(@"like count is %d",like_count); 

    if(like_count>0) 
    { 
     NSLog(@"inside like count block"); 
     cell.label_like_count.lineBreakMode=NSLineBreakByWordWrapping; 
     [cell.label_like_count sizeToFit]; 
     [cell.label_like_count setHidden:false]; 
     NSString *str_like_count=[NSString stringWithFormat:@"%lu",(unsigned long)like_count-1]; 
     if(like_count==1) 
     { 
      if([myUsername isEqualToString:first_like_user]) 
      { 
       [email protected]"You asjlike sdfsdfsd sfd "; 
       count=3; 

      } 
      else 
      { 
       first_like_user=[first_like_user stringByAppendingString:@" like this post"]; 


      } 

     } 
     else if(like_count==2) 
     { 
      first_like_user=[first_like_user stringByAppendingString:@" and "]; 
      str_like_count=[str_like_count stringByAppendingString:@" other like this post"]; 
      first_like_user=[first_like_user stringByAppendingString:str_like_count]; 

     } 
     else 
     { 
      if(like_count>1000) 
      { 
       like_count=like_count/1000; 
       str_like_count=[NSString stringWithFormat:@"%lu",(unsigned long)like_count]; 
       str_like_count=[str_like_count stringByAppendingString:@"k"]; 
       first_like_user=[first_like_user stringByAppendingString:@" and "]; 
       str_like_count=[str_like_count stringByAppendingString:@" others like this post"]; 
       first_like_user=[first_like_user stringByAppendingString:str_like_count]; 
      } 
      else 
      { 
       first_like_user=[first_like_user stringByAppendingString:@" and "]; 
       str_like_count=[str_like_count stringByAppendingString:@" others like this post"]; 
       first_like_user=[first_like_user stringByAppendingString:str_like_count]; 

      } 


     } 
     mutableAttributeStr = [[NSMutableAttributedString alloc]initWithString:first_like_user]; 

     attributeStr = [[NSAttributedString alloc]initWithString:@"\n" attributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Bold" size:8]}]; 

     [mutableAttributeStr addAttribute:NSFontAttributeName value: [UIFont fontWithName:@"Helvetica-Bold" size:14.0] range:NSMakeRange(0, count)]; 
     [mutableAttributeStr addAttribute:NSForegroundColorAttributeName value:[self colorFromHexString:@"#48a0dd"] range:NSMakeRange(0, count)]; 

     [mutableAttributeStr appendAttributedString:attributeStr]; 

     [cell.label_like_count setAttributedText:mutableAttributeStr]; 
    } 
    else 
    { 
     NSLog(@"not inside like count"); 
     [cell.label_like_count setHidden:true]; 


    } 


    // show dynamic comment 
    NSMutableArray *user_comments=user_post.comments; 
    float comment_count=[user_post.comment_count intValue]; 
    NSLog(@"post id is %@",user_post.id); 
    NSLog(@"arr comments count is %lu",(unsigned long)comment_count); 
    NSLog(@"arr user comments count is %lu",[user_comments count]); 
    if(comment_count>0) 
    { 
     NSLog(@"post id is %@",user_post.id); 

     //make label multiline 
     cell.first_comment.lineBreakMode=NSLineBreakByWordWrapping; 
     [cell.first_comment sizeToFit]; 
     cell.second_cmment.lineBreakMode=NSLineBreakByWordWrapping; 
     [cell.second_cmment sizeToFit]; 
     cell.third_comment.lineBreakMode=NSLineBreakByWordWrapping; 
     [cell.third_comment sizeToFit]; 

     NSMutableAttributedString *mutableAttributeStr; 
     NSAttributedString *attributeStr; 
     if(comment_count==1) 
     { 
      [cell.first_comment setHidden:false]; 
      [cell.second_cmment setHidden:true]; 
      [cell.third_comment setHidden:true]; 

     } 
     else if(comment_count==2) 
     { 
      [cell.first_comment setHidden:false]; 
      [cell.second_cmment setHidden:false]; 
      [cell.third_comment setHidden:true]; 

     } 
     else 
     { 
      [cell.first_comment setHidden:false]; 
      [cell.second_cmment setHidden:false]; 
      [cell.third_comment setHidden:false]; 
      [cell.btn_more_comments setHidden:false]; 

     } 
     for(l=0;l<[user_comments count];l++) 
     { 
      NSLog(@"inside loop %d",l); 
      Comment *comment=[user_comments objectAtIndex:l]; 
      NSLog(@"comment is %@",comment.comment); 
      NSLog(@"comment user is %@",comment.user_name); 
      if(l==0) 
      { 
       NSLog(@"l is zero"); 
       NSString *comment_string=[comment.user_name stringByAppendingString:@" "]; 
       comment_string=[comment_string stringByAppendingString:comment.comment]; 
       int count=(int)[comment.user_name length]; 
       mutableAttributeStr = [[NSMutableAttributedString alloc]initWithString:comment_string]; 
       NSLog(@"comment string is %@",comment_string); 
       attributeStr = [[NSAttributedString alloc]initWithString:@"\n" attributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Bold" size:8]}]; 

       [mutableAttributeStr addAttribute:NSFontAttributeName value: [UIFont fontWithName:@"Helvetica-Bold" size:14.0] range:NSMakeRange(0, count)]; 
       [mutableAttributeStr addAttribute:NSForegroundColorAttributeName value:[self colorFromHexString:@"#48a0dd"] range:NSMakeRange(0, count)]; 

       [mutableAttributeStr appendAttributedString:attributeStr]; 
       [cell.first_comment setAttributedText:mutableAttributeStr]; 


      } 
      else if(l==1) 
      { 
       NSLog(@"l is 1"); 
       NSString *comment_string=[comment.user_name stringByAppendingString:@" "]; 
       comment_string=[comment_string stringByAppendingString:comment.comment]; 
       int count=(int)[comment.user_name length]; 
       mutableAttributeStr = [[NSMutableAttributedString alloc]initWithString:comment_string]; 

       attributeStr = [[NSAttributedString alloc]initWithString:@"\n" attributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Bold" size:8]}]; 

       [mutableAttributeStr addAttribute:NSFontAttributeName value: [UIFont fontWithName:@"Helvetica-Bold" size:14.0] range:NSMakeRange(0, count)]; 
       [mutableAttributeStr addAttribute:NSForegroundColorAttributeName value:[self colorFromHexString:@"#48a0dd"] range:NSMakeRange(0, count)]; 
       NSLog(@"comment string is %@",comment_string); 
       [mutableAttributeStr appendAttributedString:attributeStr]; 
       [cell.second_cmment setAttributedText:mutableAttributeStr]; 
      } 
      else if(l==2) 
      { 
       NSLog(@"l is 2"); 
       NSString *comment_string=[comment.user_name stringByAppendingString:@" "]; 
       comment_string=[comment_string stringByAppendingString:comment.comment]; 
       int count=(int)[comment.user_name length]; 
       mutableAttributeStr = [[NSMutableAttributedString alloc]initWithString:comment_string]; 

       attributeStr = [[NSAttributedString alloc]initWithString:@"\n" attributes:@{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Bold" size:8]}]; 

       [mutableAttributeStr addAttribute:NSFontAttributeName value: [UIFont fontWithName:@"Helvetica-Bold" size:14.0] range:NSMakeRange(0, count)]; 
       [mutableAttributeStr addAttribute:NSForegroundColorAttributeName value:[self colorFromHexString:@"#48a0dd"] range:NSMakeRange(0, count)]; 

       [mutableAttributeStr appendAttributedString:attributeStr]; 
       [cell.third_comment setAttributedText:mutableAttributeStr]; 

      } 
     } 
    } 
    else 
    { 
     [cell.first_comment setHidden:true]; 
     [cell.second_cmment setHidden:true]; 
     [cell.third_comment setHidden:true]; 
     [cell.btn_more_comments removeFromSuperview]; 

    } 
    cell.label_time.text=[BaseController getTimestampForDate:date]; 
    [arr_indexpath addObject:indexPath]; 
    return cell; 

}

来源

2015-10-19 Techiee

表现你对rowatIndexpath方法 –

你在heightForRowAtIndexPath方法有哪些细胞？ –

PLAESE检查我的更新代码 – Techiee

尝试拨打[cell layoutIfNeeded]; &取代self.table_view与tabelview。这可能会帮助您解决问题

来源

2015-10-20 07:35:18 TechGuy

尝试与此有关。

-(void)dynamicTextSize{ 
UITextView *textView = [[UITextView alloc]initWithFrame:CGRectMake(200, 300, 200, 30)]; 
textView.center = self.view.center; 
[self.view addSubview:textView]; 

NSString *string = @"You long text here"; 
textView.text = string; 

//UIFont *font = [UIFont fontWithName:@"Arial" size:16.0f]; 
NSDictionary *attrDict = [NSDictionary dictionaryWithObjectsAndKeys:textView.font, NSFontAttributeName, nil]; 

textView.backgroundColor = [UIColor lightGrayColor]; 

CGRect frame = [textView.text boundingRectWithSize:CGSizeMake(textView.frame.size.width, 10000) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin attributes:attrDict context:nil]; 

CGRect mFrame = textView.frame; 
mFrame.size.width = frame.size.width; 
mFrame.size.height = frame.size.height; 
textView.frame = mFrame; 

//NSLog(@"frame2:%@",NSStringFromCGRect(textView.frame)); 
}

来源

2015-10-19 13:35:08 Jamil

我能够改变textview的高度，但为什么这只在滚动？ – Techiee

为什么UITextView高度只能在滚动上变为动态？

回答

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