Retrieve local images in UIWebView

README.md

Now in your HTML you can use:

<img src='localimg://myimage.png' />

This will retrieve the file locally.

AppDelegate.m

#import "AppDelegate.h"
#import "LMURLImageProtocol.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [NSURLProtocol registerClass:[LMURLImageProtocol class]];
    
    // etc
}

LMURLImageProtocol.h

#import <Foundation/Foundation.h>
#define kProtocolImageUrl @"localimg"

@interface LMURLImageProtocol : NSURLProtocol

@end

LMURLImageProtocol.m

#import "LMURLImageProtocol.h"


@implementation LMURLImageProtocol

+ (BOOL)canInitWithRequest:(NSURLRequest *)request{
    if ([request.URL.scheme caseInsensitiveCompare:kProtocolImageUrl] == NSOrderedSame) {
        return YES;
    }
    return NO;
}

+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request{
    return request;
}

- (void)startLoading{
    NSString *extension;
    NSString *imageName;
    [self extractImageName:&imageName extension:&extension];
    
    NSURLResponse *response =[[NSURLResponse alloc]initWithURL:self.request.URL
                                                      MIMEType:nil expectedContentLength:-1
                                              textEncodingName:nil];
    
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageName ofType:extension];
    NSData *data = [NSData dataWithContentsOfFile:imagePath];
    
    [[self client] URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];
    [[self client] URLProtocol:self didLoadData:data];
    [[self client] URLProtocolDidFinishLoading:self];
}


-(void)extractImageName:(NSString**)imageName extension:(NSString**)extension{
    NSString *urlString = self.request.URL.absoluteString;
    *extension = [urlString pathExtension];
    urlString = [urlString stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@://",kProtocolImageUrl]
                                                     withString:@""];
    *imageName = [urlString stringByDeletingPathExtension];
}

- (void)stopLoading
{
    
}
@end