CODEWITHSUNDEEP
iosurlnsstringrange
user717452
user717452

Reputation: 111

Extract URL of Image From String

I am trying to extract the URL for an image from a string of text. It may be from different websites, and could be any form of image (jpg, png, gif, etc.). What would be a good way to scan the string, find any matching picture extension, and get the graphic from it?

The string may be something like this:

Hello, I hope you like my picture located at http://www.website.com/picture1.png.  However, if you don't, I know you'll like this one http://www.website2.org/picture2.jpg.Please refer all comments to http://www.website5.com/

I want to be able to scan the string for ONLY URLs of image files, and make a new string of whatever the first image URL is. So in this string, I could create a new string that only has http://www.website.com/picture1.png

Upvotes: 1

Views: 816

Answers (3)

tushar
tushar

Reputation: 85

Use below code after later finish with @Anup Kumar

   for (NSTextCheckingResult *match in matches) {
        NSRange matchRange = [match range];
        if ([match resultType] == NSTextCheckingTypeLink) {
            NSURL *url = [match URL];
        } else if ([match resultType] == NSTextCheckingTypePhoneNumber) {
            NSString *phoneNumber = [match phoneNumber];
        }
   }

Upvotes: 1

dmason82
dmason82

Reputation: 399

Well, to get the extension you can use the NSString method pathExtension, this will result in a string with just the extension, so you will know if it is jpg, gif, png, etc.

NSString* path = @"http://location.com/pictures/image.jpg";
NSString* extension = [path pathExtension];

For your graphic you can use the UIImage imageWithData method, and pass it the output from NSData dataWithContentsOfUrl method, using these methods together will allow you to create a UIImage which you can then display in a UIImageView. 

UIImage* image = [UIImage imageWithData:[NSData dataWithContentsOfURL:path]];

Hopefully that is helpful.

Upvotes: 0

user1829646
user1829646

Reputation:

I got from The Link Objective-C - Finding a URL within a string

No need to use RegexKitLite for this, since iOS 4 Apple provide NSDataDetector (a subclass of NSRegularExpression).

You can use it simply like this (source is your string) : 

NSDataDetector* detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
NSArray* matches = [detector matchesInString:source options:0 range:NSMakeRange(0, [source length])];

Upvotes: 5

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