是否在UItableView单元格中自动添加图像？
是否在UItableView单元格中自动添加图像？
提问于 2015-10-24 13:11:51
Helo all
我在这里遇到了一个非常奇怪的情况，我有一个表格视图，其中包含自定义单元格。所以我设计了自己的自定义cell.In自定义单元格，我也在显示图像，text.The表的数据来自于server.If，json中的任何图像，然后图像将被显示，否则只有文本是displayed.So单元格将是动态的。我已经使用bezier path将文本包裹在image.No周围，如果图像在那里，那么文本将是wrapped.When。我用图像从服务器添加新的帖子&我刷新表格，然后它会自动显示其他帖子的图像，因为well.It将显示相同的图像，最后是相同的图像。我不知道为什么新的单元格在它的单元格中添加图像，即使代码运行良好，我已经用breakpoints.Please调试过了，告诉它可能是什么问题。
下面是cellForRowAtIndexPath的代码
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//define variables here
static NSString *CellIdentifier = @"homeCell";
HomeCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier
forIndexPath:indexPath];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
if([arr_post count]>0)
{
NSMutableAttributedString *mutableAttributeStr;
NSAttributedString *attributeStr;
[cell layoutIfNeeded];
//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 user info
cell.label_name.text=user_post.username;
cell.img_profile.layer.cornerRadius = 25;
cell.img_profile.clipsToBounds = YES;
[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.img_icon_location setHidden:false];
[cell.label_location setHidden:false];
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]];
[cell.tv_post setTextColor:[self colorFromHexString:user_post.font_color]];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [formatter dateFromString:user_post.modification_date];
NSLog(@"user post image is %@",user_post.post_image);
if([user_post.post_image isEqualToString:@"none"] && [user_post.post_video isEqualToString:@"none"])
{
NSLog(@"NOT INSIDE THE CONDITION");
}
else
{
NSLog(@"INSIDE BEIZER PATH CONDITION");
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)];
if(![user_post.post_image isEqualToString:@"none"])
{
[tv_image setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.post_image]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]];
}
if(![user_post.post_video isEqualToString:@"none"])
{
[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;
if([user_post.post_image isEqualToString:@"none"] && [user_post.post_video isEqualToString:@"none"])
{
CGFloat fixedWidth = cell.tv_post.frame.size.width;
CGSize newSize = [cell.tv_post sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
CGRect newFrame = cell.tv_post.frame;
newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
cell.tv_post.frame = newFrame;
cell.tv_height.constant=cell.tv_post.frame.size.height;
[cell.view_tvContainer layoutIfNeeded];
}
//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=recent_like_name=user_post.recent_like_name;
NSLog(@"FIRST LIEK USER IS %@",first_like_user);
NSString *str_recent_like_name;
int count=(int)[first_like_user length];
int like_count=[user_post.like_count intValue];
if(like_count>0)
{
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])
{
first_like_user=@"You like this post ";
count=3;
}
else
{
first_like_user=[first_like_user stringByAppendingString:@" like this post"];
}
}
else if(like_count==2)
{
if([first_like_user isEqualToString:myUsername])
{
first_like_user=@"You";
}
Post *temp_user_post=[copy_arr_user_post objectAtIndex:indexPath.row];
first_like_user=[first_like_user stringByAppendingString:@" and "];
if(temp_user_post.recent_like_name==nil)
{
temp_user_post.recent_like_name=@"";
}
str_recent_like_name=[temp_user_post.recent_like_name_two stringByAppendingString:@" like this post"];
first_like_user=[first_like_user stringByAppendingString:str_recent_like_name];
}
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
{
if([first_like_user isEqualToString:myUsername])
{
first_like_user=@"You";
}
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
{
[cell.label_like_count setHidden:true];
}
// show dynamic comment
NSMutableArray *user_comments=user_post.comments;
float comment_count=[user_post.comment_count intValue];
NSLog(@"ID IS %@",user_post.id);
if(comment_count>0)
{
//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];
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++)
{
Comment *comment=[user_comments objectAtIndex:l];
NSString *comment_string=[comment.user_name stringByAppendingString:@" "];
comment_string=[comment_string stringByAppendingString:comment.comment];
int count=(int)[comment.user_name length];
NSMutableAttributedString* mutableAttributeStr = [[NSMutableAttributedString alloc]initWithString:comment_string];
NSAttributedString *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];
// end of the repetitive pattern
if (l == 0)
{
[cell.first_comment setAttributedText:mutableAttributeStr];
}
else if (l == 1)
{
[cell.second_cmment setAttributedText:mutableAttributeStr];
}
else if (l == 2)
{
[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 timeAgoStringFromDate:date];
[arr_indexpath addObject:indexPath];
}
return cell;
}回答 8
Stack Overflow用户
发布于 2015-10-24 16:41:59
请记住，这些单元是重复使用的。假设您的表数据源中有10000行，那么表视图不会创建那么多行。它只会创建足够的行显示在屏幕上，以及其他几个要预加载的行。
每次滚动表格时，tableview将使用那些不可见的单元格来加载刚刚变为可见的新单元格，从而产生无限行数的错觉。这就是为什么这些新单元格具有旧数据。因此，基本上，如果没有可用的镜像，您必须在cellForRowAtIndexpath:中将UIImageView的镜像设置为nil。
if([user_post.post_image isEqualToString:@"none"] && [user_post.post_video isEqualToString:@"none"])
{
NSLog(@"NOT INSIDE THE CONDITION");
}在上面的代码中，您只需打印出一个日志，而您还必须将UIImageView's图像设置为nil。
所以这是我的建议：
//if([user_post.post_image isEqualToString:@"none"] && [user_post.post_video isEqualToString:@"none"])
//{
// NSLog(@"NOT INSIDE THE CONDITION");
//}
//else
{
NSLog(@"INSIDE BEIZER PATH CONDITION");
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)];
if(![user_post.post_image isEqualToString:@"none"])
{
[tv_image setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.post_image]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]];
}
else{
[tv_image setImage:nil]; //Prevent the old data to be shown
}
if(![user_post.post_video isEqualToString:@"none"])
{
[tv_image setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.post_video_thumbnail]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]];
}
else{
[tv_image setImage:nil];//Prevent the old data to be shown
}
[cell.tv_post addSubview:tv_image];
}也许这段代码不符合您对数据显示方式的要求，但希望它能帮助您理解！
Stack Overflow用户
发布于 2015-10-24 16:18:53
当需要显示表视图单元格时，您可以创建一个新的单元格，也可以重用先前创建但在屏幕上不再可见的单元格。因为您已经创建了一个UIImageView并将其添加到一个单元格中，所以当您重用它时，图像仍然在那里。
为了阻止这种情况的发生，你需要保留一个对图像视图的引用，这样下次你就可以删除它了。由于您是动态添加它们的，并且没有IBOutlet，因此最快的选择是为图像分配一个tag
UIImageView *tv_image =[[UIImageView alloc]initWithFrame:CGRectMake(0, 10, 100, 100)];
tv_image.tag = 21; // arbitrary number but must be unique to the image通过标记图像，下一次您可以访问它：
UIImageView *tv_image = (UIImageView*)[cell viewWithTag:21];
if (tv_image != nil) {
tv_image.image = nil; // remove the image (or remove the image view from the cell etc)
}只需确保相应地重构代码，以便在从标记中找到图像时，不需要重新创建它，等等
Stack Overflow用户
发布于 2015-10-27 13:12:11
您的img_profile正在重复，因为您正在重用该单元格。
替换下面的代码行
[cell.img_profile setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.user_profileImage]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]];使用以下代码：
if (user_post.user_profileImage.length == 0) {
cell.img_profile.hidden = true;
}else{
[cell.img_profile setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_post.user_profileImage]]placeholderImage:[UIImage imageNamed:@"post_placeholder.png"]];
}说明：-检查您的json是否包含用户配置文件图像，然后设置图像，否则隐藏配置文件图像视图。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/33314766
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