I have successfully implemented lazy loading using the class UIImageView+WebCache.h.
Is there any easy method for lazy loading without using the class UIImageView+WebCache.h?
You can load the images in a UIWebView. For example:
-(UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *identifier = #"ID";
UITableViewCell *cell = [self.tv dequeueReusableCellWithIdentifier:identifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
UIWebView *webView=[[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
NSLog(#"URL=%#",[arrayURL objectAtIndex:indexPath.row]);
NSURL *url=[NSURL URLWithString:[arrayURL objectAtIndex:indexPath.row]];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
[webView loadRequest:req];
webView.scalesPageToFit=TRUE;
[cell.contentView addSubview:webView];
}
return cell;
}
Related
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"HistoryCell";
//UITableViewCell *cell = (TableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
UITableViewCell * Cell=[tblView dequeueReusableCellWithIdentifier:cellIdentifier];
if (Cell == nil)
{
Cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
Cell.selectionStyle = UITableViewCellSelectionStyleBlue;
}
myString=[arr objectAtIndex:indexPath.row];
NSLog(#"String %#",myString);
//NSString *newString = [myString stringByReplacingOccurrencesOfString:#" " withString:#"%20"];
NSURL *imageURL =[NSURL URLWithString:myString];
NSData *image = [[NSData alloc] initWithContentsOfURL:imageURL];
UIImageView *imageview=[[UIImageView alloc]initWithFrame:CGRectMake(00, 00, 80, 80)];
imageview.image=[UIImage imageWithData:image];
[Cell addSubview:imageview];
//cell.imageView.image=[UIImage imageWithData:image];
return Cell;
}
Please make the following correction:
static NSString *cellIdentifier = #"HistoryCell";
UITableViewCell * Cell=[tblView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
This might be the missing words....
I want to use lazy loading of images concept in my table view. My array of image rul string is ( MSMutableArray ) "images". How can I implement this in cellForRowAtIndexPath.
It looks like:
-(UITableViewCell *) tableView:(UITableView *)AtableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell=[searchtable dequeueReusableCellWithIdentifier:#"cell"];
if(!cell)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
cell.textLabel.font=[UIFont systemFontOfSize:12];
cell.imageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[appSmallLogos objectAtIndex:indexPath.row]]]];
cell.detailTextLabel.text=[appReleaseDates objectAtIndex:indexPath.row];
}
return cell;
}
Try this code :
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
indicator.frame = CGRectMake(your bounds);
[cell addSubview:indicator];
[indicator bringSubviewToFront:self.view];
[indicator startAnimating];
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{
//This is what you will load lazily
NSString *u=[NSString stringWithContentsOfFile:r.url encoding:NSUTF8StringEncoding error:nil];
NSURL *imageURL=url;
NSData *image=[NSData dataWithContentsOfURL:imageURL];
dispatch_sync(dispatch_get_main_queue(), ^{
CustomCell *cell = (CustomCell *)[tableView cellForRowAtIndexPath:indexPath];
cell.imageView.image=[UIImage imageWithData:image];
[cell setNeedsLayout];
[indicator stopAnimating];
});
});
cell.cellDescription.text=r.url;// this is which you want to add in first time.
I am not sure but try it.
You can use the SDWebImage library, the library will download and cache the image asynchronously. by passing the url to it as argument
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MyIdentifier = #"MyIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:MyIdentifier] autorelease];
}
// Here we use the new provided setImageWithURL: method to load the web image
[cell.imageView setImageWithURL:[NSURL URLWithString:#"http://www.domain.com/path/to/image.jpg"]
placeholderImage:[UIImage imageNamed:#"placeholder.png"]];
cell.textLabel.text = #"My Text";
return cell;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
TableCellLayout *cell = (TableCellLayout *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[TableCellLayout alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.cellName = [[array valueForKey:#"name"] objectAtIndex:indexPath.row];
cell.cellImage = [UIImage imageNamed:#"placeholder.png"]; // add a placeholder
NSString *imageURL = [[array valueForKey:#"imageLink"] objectAtIndex:indexPath.row];
NSURL *theURL = [NSURL URLWithString:imageURL];
if (asynchronousImageLoader == nil){
asynchronousImageLoader = [[AsynchronousImages alloc] init];
}
[asynchronousImageLoader loadImageFromURL:theURL];
cell.cellImage = asynchronousImageLoader.image;
return cell;
}
I finally managed to do it setting the image with:
– performSelectorOnMainThread:withObject:waitUntilDone:
After the image is downloaded
Well basically I am trying to pass a string to a uiwebview that just so happens to be in html format, however I am passing it to the uiwebview using loadHTMLString:myHTML.
the problem that I am having is that I cannot see any text at all. I have set up a custom view which I have then deleted the view, added a uitableviewcell then inside the cell I have added a uiwebview. I have then set the related class to the class in which I would like to display the tableviewcell, then linked my getter/setter to the tableviewcell and the uiwebview inside the tableviewcell..
Then this is the code that follows with me trying to set the richtext of the uiwebview.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (indexPath.section == 0) {
if (indexPath.row == 0) {
// Set cell height
[self tableView:tableView heightForRowAtIndexPath:indexPath];
// Configure the cell using custom cell
[[NSBundle mainBundle] loadNibNamed:#"SearchCellHtml" owner:self options:nil];
cell = searchCellHtml;
// pass in some data into myHTML
myUIWebView = [[UIWebView alloc] init];
NSString *myHTML = #"<html><body><h1>Hello, world!</h1></body></html>";
[myUIWebView loadHTMLString:myHTML baseURL:nil];
//Disclosure Indicator
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
any help with this would be greatly appreciated.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (indexPath.section == 0) {
if (indexPath.row == 0) {
[self tableView:tableView heightForRowAtIndexPath:indexPath];
// load the cell ?
cell = [[NSBundle mainBundle] loadNibNamed:#"SearchCellHtml" owner:self options:nil];
myUIWebView = [[[UIWebView alloc] init] autorelease]; // autorelease
NSString *myHTML = #"<html><body><h1>Hello, world!</h1></body></html>";
[myUIWebView loadHTMLString:myHTML baseURL:nil];
//add webView to your cell
myUIWebView.frame = cell.bounds;
[cell addSubview:myUIWebView];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
I download some images using an NSThread. When all the images are downloaded, I have to put them in cell.myimageview. Give me the solution for setting an image in a user-defined method.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
TableCell *cell = (TableCell *)[TableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[TableCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
NSString *bedsbaths=[NSString stringWithFormat:#"Beds:%# Baths:%#",[[AppDeleget.statuses valueForKey:#"beds"] objectAtIndex:indexPath.row],[[AppDeleget.statuses valueForKey:#"baths"] objectAtIndex:indexPath.row]];
cell.mlsno.text=[[AppDeleget.statuses valueForKey:#"mlsno"] objectAtIndex:indexPath.row];
cell.price.text=[[AppDeleget.statuses valueForKey:#"price"] objectAtIndex:indexPath.row];
cell.address.text=[[AppDeleget.statuses valueForKey:#"address"] objectAtIndex:indexPath.row];
cell.bedsbaths.text=bedsbaths;
cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
return cell;
}
-(void)LoadImage
{
for(int x=0;x<[ListPhotos count];x++)
{
NSData *imageData =[ListPhotos objectAtIndex:x];
id path = imageData;
NSURL *url = [NSURL URLWithString:path];
NSLog(#"%#",url);
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc] initWithData:data];
[self performSelectorOnMainThread:#selector(downloadDone:) withObject:img waitUntilDone:NO];
}
}
-(void)downloadDone:(UIImage*)img {
// I have to set the cell here. How?
cell.myimageView.image=img
}
In -(void)LoadImage
Store the img in a NSArray.
In - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath , code as
cell.myimageView.image=[imgArray objectAtIndex:indexPath.row];
Assign the delegate and datasource of tableview as,
-(void)downloadDone:(UIImage*)img {
self.tableView.delegate=self;
self.tableView.datasource=self;
}
i am trying to load a image in uiwebview in a tableView cell using
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
NSInteger Index=indexPath.row;
switch (Index)
{
case 0:
[cell.contentView addSubview:webView];
NSString *str=[[NSString alloc]initWithFormat:#"%#",[appDelegate.respSrcUrl objectAtIndex:0]];
NSURL *url = [NSURL URLWithString: str];
NSString *htmlString = #"<html><body><img src='%#' width='900'></body></html>";
NSString *imageHTML = [[NSString alloc] initWithFormat:htmlString,url];
webView.scalesPageToFit = YES;
[webView loadHTMLString:imageHTML baseURL:nil];
break;
default:
break;
}
but no image is getting loaded in the webview. how can i display the image in webview??
Make sure you return cell; at the end of the delegate method.