【发布时间】:2016-05-04 04:43:52
【问题描述】:
我需要创建一个UITableView,并在其中发布不同数量的图像,例如Facebook 或Twitter 或WeChat 朋友。返回动态单元格高度并根据它们的数量排列图像。
我将图像的动态单元格高度设置为:
在HomeTableViewCell.m
使包含帖子图像作为属性的视图的高度自动布局约束
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *height;
并将其常数设置为不同的值以使单元格动态高度
self.height.constant = imageArray.count > 3 ? 260.0 : imageArray.count == 0 ? 0.0 : 130.0;
还有文字的高度为:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewAutomaticDimension;
}
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
HomeTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
return 130 + cell.height.constant;
}
完成后,它和第一张图片一样好用,然后我通过SDWebImage框架加载图片,我在单元格中创建最多6张图片的imageCollection
@property (strong, nonatomic) IBOutletCollection(UIImageView) NSArray *imageViewCollection;
- (void)loadCellDataWithInfo: (SharedUserInfo *)info {
self.userInfo = info;
[self.avatarImageView sd_setImageWithURL:[NSURL URLWithString:info.profileImageUrlStr] placeholderImage:[UIImage imageNamed:@"penguinMe"]];
self.avatarImageView.layer.cornerRadius = self.avatarImageView.frame.size.width/2.0;
self.name.text = info.fullName;
self.username.text = info.userName;
self.text.text = [info.postDic objectForKey:@"text"];
self.likeLabel.text = [NSString stringWithFormat:@"%li", [[info.postDic objectForKey:@"likesCount"]integerValue]];
self.commentLabel.text = [NSString stringWithFormat:@"%li", [[info.postDic objectForKey:@"commentsCount"]integerValue]];
self.elapsed.text = [info.postDic objectForKey:@"elapsed"];
NSArray *imageArray = [info.postDic objectForKey:@"images"];
[self loadImagesWithURLStr:imageArray];
self.height.constant = imageArray.count > 3 ? 260.0 : imageArray.count == 0 ? 0.0 : 130.0;
}
- (void)loadImagesWithURLStr: (NSArray *)urlStrArray {
switch (urlStrArray.count) {
case 0:
break;
case 4:
for (int index = 0; index < urlStrArray.count; index++) {
if (index >= 2) {
[self.imageViewCollection[index + 1] sd_setImageWithURL:[NSURL URLWithString:urlStrArray[index]]];
} else {
[self.imageViewCollection[index] sd_setImageWithURL:[NSURL URLWithString:urlStrArray[index]]];
}
}
break;
default:
for (int index = 0; index < urlStrArray.count; index++) {
[self.imageViewCollection[index] sd_setImageWithURL:[NSURL URLWithString:urlStrArray[index]]];
}
break;
}
}
现在我遇到了问题,一些没有图像的单元格会重复从其他地方加载一些图像,似乎只有没有任何帖子图像的单元格会遇到这样的问题
Cell 确实有图片效果很好,它取决于包含不同数量的图片 URL 字符串的 imagesArray
最后我所有的重用代码和单元部分代码
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
HomeTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
[cell loadCellDataWithInfo:self.followingArray[indexPath.row]];
return cell;
}
- (void)loadCellDataWithInfo: (SharedUserInfo *)info {
self.userInfo = info;
[self.avatarImageView sd_setImageWithURL:[NSURL URLWithString:info.profileImageUrlStr] placeholderImage:[UIImage imageNamed:@"penguinMe"]];
self.avatarImageView.layer.cornerRadius = self.avatarImageView.frame.size.width/2.0;
self.name.text = info.fullName;
self.username.text = info.userName;
self.text.text = [info.postDic objectForKey:@"text"];
self.likeLabel.text = [NSString stringWithFormat:@"%li", [[info.postDic objectForKey:@"likesCount"]integerValue]];
self.commentLabel.text = [NSString stringWithFormat:@"%li", [[info.postDic objectForKey:@"commentsCount"]integerValue]];
self.elapsed.text = [info.postDic objectForKey:@"elapsed"];
NSArray *imageArray = [info.postDic objectForKey:@"images"];
[self loadImagesWithURLStr:imageArray];
self.height.constant = imageArray.count > 3 ? 260.0 : imageArray.count == 0 ? 0.0 : 130.0;
}
所以最重要的是,重用 imageViewCollection 的问题,有什么建议吗?对此表示赞赏。
【问题讨论】:
-
您应该先将 imageview 设置为 nil,然后再尝试重用单元格。基本上在您尝试使用 sd_setImageWithURL 下载图像之前放置它
标签: ios uitableview uiimageview