I am using some regex expression to get the first URL in an xml which is a link to a photo, and set that photo as the cell's imageview image. Here is my code:
NSString *thearticleImage = entry.articleImage;
NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:#"(?i)\\b((?:[a-z][\\w-]+:(?:/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:'\".,<>?«»“”‘’]))" options:NSRegularExpressionCaseInsensitive error:NULL];
NSString *someString = thearticleImage;
self.theurl = [someString substringWithRange:[expression rangeOfFirstMatchInString:someString options:NSMatchingCompleted range:NSMakeRange(0, [someString length])]];
cell.imageView.image = [NSURL URLWithString:theurl];
I end up gettin the error:
'-[NSURL _isResizable]: unrecognized selector sent to instance 0x882e250'
What is the issue with this?
you can't use url to imageView.image so you can use this like below
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"your image link"]];
UIImage *downloadedImage = [UIImage imageWithData:imageData];
cell.imageView.image = downloadedImage;
But it will produce crash...
NOTE
To overcome with this crash you must hit the URL asynchronously .BY this it will not produce crash and table will freely scroll
Related
this is my code:
#define GOOGLE_STATIC_MAP_IMAGE #"https://maps.googleapis.com/maps/api/staticmap?center=%#&zoom=15&size=320x150&maptype=roadmap&markers=color:green|label:H|%#"
-(UIImage*)GetGoogleStaticMap
{
NSString* coordinates = [NSString stringWithFormat:#"%f,%f", latitude, longitude];
NSString *stringURL = [NSString stringWithFormat:GOOGLE_STATIC_MAP_IMAGE, coordinates, coordinates]; //coordinates x2 = for the center & the marker
NSURL *url = [NSURL URLWithString:stringURL];
NSData *imageData = [[NSData alloc] initWithContentsOfURL:url];
UIImage *image = [UIImage imageWithData:imageData];
return image;
}
if I paste stringURL to the browser i get the desired result, but imageData returns nil - ideas?
It may have returned nil because of certain characters in the string.
Try calling stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding on your stringURL before creating the url object.
For example:
newStringURL = [stringURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
I am new to iPhone App development.
When I run a sample project, I did which parses an xml feed and displays the contents along with image in a table view, I get this error -
"NSInvalidArgumentException', reason: '-[__NSCFString isFileURL]: unrecognized selector sent to instance 0x712e450'"
It is occurring only when I try to display the image in UITableViewCell.
The code I used for getting images from url is -
if([elementName isEqualToString:IMAGE])
{
NSURL *imageUrl = [attributeDict objectForKey:#"url"];
NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];
bbc.image = [UIImage imageWithData:imageData];
}
where bbc is a class(NSObject subclass) object used to store the parsed contents.
I think you are using NSString as NSURL. Try this:
NSURL *imageUrl =[NSURL URLWithString:[attributeDict objectForKey:#"url"]];
It looks like "url" is in fact an NSString, not an NSURL object. Convert it to an NSURL object yourself:
if ([elementName isEqualToString:IMAGE])
{
NSString *urlStr = [attributeDict objectForKey:#"url"];
NSURL *imageUrl = [NSURL URLWithString:urlStr];
NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];
bbc.image = [UIImage imageWithData:imageData];
}
imageURL is not a NSURL, but a string.
I´m designing a new app for an iPad. This app will work with a barcode scanner, and when it scans a code, it will show an image asociated.
I was thinking to build that asociating de barcode to an image name for example:
- Barcode 09090909 will show 09090909.png picture
- Barcode 19191919 will show 19191919.png picture
....
I think that there is no problem with that, but the problem comes when I need to add new barcode/pictures to the app. How can I send a new picture to my App? I see that when you develop on XCode and build you App, all the data goes into de App.
Any help or clue? thanks in advance
You can simple load them on the fly from your server, but then a network connection is required. To load them async from an server you can use this code:
dispatch_queue_t image_queue = dispatch_queue_create("com.company.app.imageQueue", NULL);
dispatch_queue_t main_queue = dispatch_get_main_queue();
dispatch_async(image_queue, ^{
NSString *URLString = #"http://example.com/images/19191919.png";
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:URLString];
UIImage *image = [UIImage imageWithData:imageData];
dispatch_async(main_queue, ^{
[imageView setImage:image];
});
});
If you want you can also save the image to the cache dir (using the document dir is not recommended because it will collide with Apples iOS Data Storage Guidelines) and check before downloading an image twice, then the code will look like this:
NSString *fileName = #"19191919.png";
NSString *URLBaseString = #"http://example.com/images/";
NSString *URLString = [URLBaseString stringByAppendingString:fileName];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [paths objectAtIndex:0];
NSString *dataPath = [cachePath stringByAppendingPathComponent:fileName];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ( [fileManager fileExistsAtPath:dataPath] )
{
UIImage *image = [UIImage imageWithContentsOfFile:dataPath];
[imageView setImage:image];
}
else
{
dispatch_async(image_queue, ^{
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:URLString];
UIImage *image = [UIImage imageWithData:imageData];
[UIImagePNGRepresentation(image) writeToFile:dataPath atomically:YES];
dispatch_async(main_queue, ^{
[imageView setImage:image];
});
});
}
This code has not been tested, but should work. Note that I'm relying on ARC to manage memory.
I'm trying to load an image into the cell,
The following code is working correctly :
NSString *imageURL = #"http://localhost/images/image2.jpg";
NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imageURL]];
UIImage *rowImage = [[UIImage alloc] initWithData:imageData];
cell.image=rowImage;
but when i change imageURL to be dynamic , the image isn't displayed :
NSString *imageURL = [[stories objectAtIndex:indexPath.row] objectForKey:#"image"];
You might be saying the problem is in :
[[stories objectAtIndex:indexPath.row] objectForKey:#"image"];
But it's not , i've tried to log it and the output is as expected :
NSSLog(#"%#",[[stories objectAtIndex:indexPath.row] objectForKey:#"image"]);
//Outputs http://localhost/images/image2.jpg
What could be wrong ?
I am guessing there is space before or after the string. So do this,
NSString *imageURL = [[stories objectAtIndex:indexPath.row] objectForKey:#"image"];
imageURL = [imageURL stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imageURL]];
UIImage *rowImage = [[UIImage alloc] initWithData:imageData];
While this should mostly fix your issue, I suggest you trim the strings before adding to the dictionary during the XML parsing.
You should also ensure you release both imageData and rowImage. You might be doing it already but its not in the code above so I just wanted to indicate that it could be leaking.
try this one
NSString *imageURL =[NSString stringWithFormat:#"%#",[[stories objectAtIndex:indexPath.row] objectForKey:#"image"]];
I'm using the following code to fetch some images, that are going into a tableview. But it takes ages (5-6 seconds) to get the 30 images in.
Is there a smarter/faster way to do this?
NSString *imageUrl = ......;
NSString *urlStr =
[imageUrl UrlstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *path = [[NSString alloc] initWithFormat:#"http://xxx.dk/xml.aspx%#", urlStr];
NSURL *url = [NSURL URLWithString:path];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc] initWithData:data];
return img;
[..... release];
Here profileimg is an get from Api ,String name
NSString *profileimg=[Check objectForKey:#"IMAGE"];
imageview.image=[[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:profileimg]]];
I'd rather download every new image in array of images when a cell appears on the screen and just display already saved image if a cell appears on the screen for the second time (i.e. image for this cell has been already downloaded).
use asynchronize loading of image.
check out this sample code : http://developer.apple.com/library/ios/#samplecode/LazyTableImages/Introduction/Intro.html