我有一个表格视图单元格，有标签和图像，滚动图像和标签变化，这是由于单元格出列功能。我试图通过将imageview设置为nil来解决它，但它没有工作。 重复的问题是使用PinImageView，它从一组图像中获取图像，而不是从URL中获取图像的图像。
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentifier=@"cellIdentifier";
TripInfoListCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell==nil) {
cell=(TripInfoListCell *)[[[NSBundle mainBundle] loadNibNamed:@"TripInfoListCell" owner:self options:nil] firstObject];
}
cell.PinImageView.image = nil;
NSString *direction=[dict123 valueForKey:@"direction" ] ;
NSString *drive_status=[dict123 valueForKey:@"driver_or_rider"];
if((indexPath.row==totalRow-1)&&[direction isEqual:@"From"])
{
__weak TripInfoListCell *weakCell = cell;
cell.PinImageView.image=[UIImage imageNamed:@"pin7@2x.png"];
cell.userNameLabel.text=loggedUser.profile_name;
cell.riderDriverSlNo.text=@"Driver";
if([drive_status isEqual:@"Ride"])
{
cell.riderDriverSlNo.text=@"Driver";
cell.userNameLabel.text=@"Driver"; //In case of "Rider" "From" name in the last row
}
else{
cell.availabiltyInfoLabel.text=@"You";
}
NSString *imagePic = [[NSUserDefaults standardUserDefaults] objectForKey:@"user_image"];
NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:imagePic]];
[cell.userImageView setImageWithURLRequest:request placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
weakCell.userImageView.image=image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(@"%@",error);
}];
}
else if((indexPath.row==totalRow-1)&&[direction isEqual:@"To"])
{
cell.PinImageView.image=[UIImage imageNamed:@"pin7@2x.png"];
cell.userNameLabel.text=[_tripDetails objectForKey:@"park_name"];
NSString *image=[NSString stringWithFormat:@"%@",[dict123 objectForKey:@"parkBannerImageUrl"]];
[[ImageHandler sharedInstance] getImageFromURL:image withCompletion:^(UIImage *image) {
if (image) {
[cell.userImageView setImage:image];
}
}];
}
else
if ([tableGoersList count] > indexPath.row)
{
NSDictionary *goersInfo=[tableGoersList objectAtIndex:indexPath.row];
[[NSUserDefaults standardUserDefaults]setObject:[goersInfo valueForKey:@"user_image_url"] forKey:@"user_image"];
[[NSUserDefaults standardUserDefaults]synchronize];
__weak TripInfoListCell *weakCell = cell;
NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:goersInfo[@"user_image_url"]]];
[cell.userImageView setImageWithURLRequest:request placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
weakCell.userImageView.image=image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(@"%@",error);
}];
if((indexPath.row==0)&&[direction isEqual:@"To"]) {
if([drive_status isEqual:@"Drive"]){
cell.riderDriverSlNo.text=@"Driver";
cell.PinImageView.image=[UIImage imageNamed:@"pin1@2x.png"];
cell.userNameLabel.text=loggedUser.profile_name;
cell.availabiltyInfoLabel.text=@"You";
}
else{
}
}
else if((indexPath.row==0)&&[direction isEqual:@"From"]) {
if([drive_status isEqual:@"Drive"])
{
cell.PinImageView.image=[UIImage imageNamed:@"pin1@2x.png"];
cell.userNameLabel.text=[_tripDetails objectForKey:@"park_name"];
cell.riderDriverSlNo.text=@"";
cell.availabiltyInfoLabel.text=@"";
NSString *image=[NSString stringWithFormat:@"%@",[dict123 objectForKey:@"parkBannerImageUrl"]];
[[ImageHandler sharedInstance] getImageFromURL:image withCompletion:^(UIImage *image) {
if (image) {
[cell.userImageView setImage:image];
}
}];
}
else{
NSLog(@"rider from");
cell.riderDriverSlNo.text=@"";
}
}
else{
imageNameArray = [[NSArray alloc] initWithObjects:@"pin2@2x.png", @"pin3@2x.png", @"pin4@2x.png", @"pin5@2x.png", @"pin6@2x.png",@"pin8@2x.png",@"pin9@2x.png", nil];
NSString* nameStr=[goersInfo valueForKey:@"name"];
NSArray * nameStrArray = [nameStr componentsSeparatedByString: @"'s"];
nameStr=[nameStrArray objectAtIndex:0];
cell.riderDriverSlNo.text=[NSString stringWithFormat:@"Rider %ld",(long)indexPath.row];
index = [TripInfoVC ifNameExists:_arrName Name:nameStr];
if(index == 0)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:0]];
[_arrName addObject:nameStr];
}
if(index == 1)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:1]];
}
if(index == 2)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:2]];
}
if(index == 3)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:3]];
}
if(index == 4)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:4]];
}
if(index == 5)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:5]];
}
if(index == 6)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:6]];
}
if(index == 7)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:0]];
}
if(index == 8)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:1]];
}
if(index == 9)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:2]];
}
if(index == 10)
{
cell.PinImageView.image=[UIImage imageNamed:[imageNameArray objectAtIndex:3]];
}
} // this pinImageView is the pin image which is repeated on scrolling
return cell;
}
请帮我解决这个问题。
答案 0 :(得分：0)
您必须通过在操作队列中将代码添加到UICollection cellForRowAtIndexPath方法的委托方法中来实现飞行或延迟加载中的加载映像。
而且，如果你在UI上做了一些放在主线程中的东西，这是另一个例子：
使用SDWebImageManager在UICollectionView中延迟加载图像
答案 1 :(得分：0)
你可能面临关闭碰撞。当你声明完成块
时[cell.userImageView setImageWithURLRequest:request placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
weakCell.userImageView.image=image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(@"%@",error);
}];
weakCell是UITableView委托请求的单元格对象的指针。它可能会在您滚动表格后重复使用，此时您的完成块实际上可能会被调用，因为下载 过程不是即时的。
如何处理？我会使用UITableViewCell.tag属性来识别我需要单元格时请求的确切图像，并且它与我在完成块运行时尝试放入该单元格的图像相匹配。也许其他一些下载后来被解雇并覆盖了标签属性。