Use the method - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType in your UiWebView's delegate to determine when it wants to load resource.
When the method get's called, you just need to parse the URL from the parameter (NSURLRequest *)request, and return NO if it's one of your desired type and continue with your logic (UIActionSheet) or return YES if the user just clicked a simple link to a HTML file.
Makes sense?
Edit_: For better understanding a quick code example
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if(navigationType == UIWebViewNavigationTypeLinkClicked) {
NSURL *requestedURL = [request URL];
// ...Check if the URL points to a file you're looking for...
// Then load the file
NSData *fileData = [[NSData alloc] initWithContentsOfURL:requestedURL;
// Get the path to the App's Documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
[fileData writeToFile:[NSString stringWithFormat:@"%@/%@", documentsDirectory, [requestedURL lastPathComponent]] atomically:YES];
}
}
Edit2_: I've updated the code sample after our dicussion about your issues in the chat:
- (IBAction)saveFile:(id)sender {
// Get the URL of the loaded ressource
NSURL *theRessourcesURL = [[webView request] URL];
NSString *fileExtension = [theRessourcesURL pathExtension];
if ([fileExtension isEqualToString:@"png"] || [fileExtension isEqualToString:@"jpg"]) {
// Get the filename of the loaded ressource form the UIWebView's request URL
NSString *filename = [theRessourcesURL lastPathComponent];
NSLog(@"Filename: %@", filename);
// Get the path to the App's Documents directory
NSString *docPath = [self documentsDirectoryPath];
// Combine the filename and the path to the documents dir into the full path
NSString *pathToDownloadTo = [NSString stringWithFormat:@"%@/%@", docPath, filename];
// Load the file from the remote server
NSData *tmp = [NSData dataWithContentsOfURL:theRessourcesURL];
// Save the loaded data if loaded successfully
if (tmp != nil) {
NSError *error = nil;
// Write the contents of our tmp object into a file
[tmp writeToFile:pathToDownloadTo options:NSDataWritingAtomic error:&error];
if (error != nil) {
NSLog(@"Failed to save the file: %@", [error description]);
} else {
// Display an UIAlertView that shows the users we saved the file :)
UIAlertView *filenameAlert = [[UIAlertView alloc] initWithTitle:@"File saved" message:[NSString stringWithFormat:@"The file %@ has been saved.", filename] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[filenameAlert show];
[filenameAlert release];
}
} else {
// File could notbe loaded -> handle errors
}
} else {
// File type not supported
}
}
/**
Just a small helper function
that returns the path to our
Documents directory
**/
- (NSString *)documentsDirectoryPath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
return documentsDirectoryPath;
}
