从邮件中打开文件

Question

I'm struggling with file handling on iOS. I could already assign my file type to iOS and I can launch my app from mail with a special file. My app is launching and I'm firing this method:

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{
    if([url isFileURL])
    {
        NSString *fileConts = [[NSString alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@", url] encoding:NSUTF8StringEncoding error:nil];
        [self.viewController openFile:fileConts];
        fileConts = nil;
    }
    return YES;
}

The openFile:(NSString) method is declared in the viewController and sets the value of a textView (for now). This method works fine. I tested it via [self.viewController openFile:@"test"]; .

But when my application launches with file attached, the textView keeps empty. It seems that it doesn't adopt the string value or that it can't read the string value.

Answer 1

handleOpenURL will be called only if application already running (in the background).

To make sure you correctly dispatch incoming files, you also need to check it on the app launch:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSURL *url = (NSURL *)[launchOptions valueForKey:UIApplicationLaunchOptionsURLKey];
// Process url here
}

It's good idea to have 1 URL dispatcher called both from handleOpenURL and didFinishLaunchingWithOptions.

Answer 2

I could solve my problem. My mistake was to initWithContentsOfFile:(NSString *)

I updated my code with NSString *fileConts = [[NSString alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];

Now I'm happy! Thanks for help.