I'm new to the site and probably even newer to app development, however i'm learning slowly.. lol
So i hit my first big snag, I've researched all over on the web and can't find what I'm looking for, so here we go.
I'm creating an app that calls upon some user inputted files that can and do change on occasion. I've added the UIFileSharing option for this so users can upload files via iTunes.
There are 3 different types of files that will need to be used, a .opt, a .pkg, and a .txt.
Is there some way i can take the files from the directory, read them, and based off the file extension pull them and use them in a UIPickerView wheel? I'm really new at this so please forgive me when i ask you to be specific.
My assumption is to do this in a few steps, first read the files and sort them and place them in an array based on the extension, then use said array to populate the picker, and also to get the count for number of rows etc..
I guess the second two parts are pretty simple to figure out, just setting up a picker to use an array, i just need to know if its possible to build that array based on the user loaded files.
thanks in advance,
Chuck
You'll need to use the UIDocumentInteractionController class.
Simple Example
UIDocumentInteractionController * controller;
NSURL *fileURL=[NSURL fileURLWithPath:[self getFilePath]]
controller = [ UIDocumentInteractionController interactionControllerWithURL: fileURL ];
// How to get File From the Document Directory
-(NSString *)getFilePath{
NSString *documentPath= [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
return [documentPath stringByAppendingPathComponent:#"Your file name"]
}
I solved it guys, thanks for all the help.. Code is below, for anyone interested. Don't forget to define your arrays!
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *bundleDirectory = [fileManager contentsOfDirectoryAtPath:documentsPath error:nil];
NSPredicate *Option = [NSPredicate predicateWithFormat:#"self ENDSWITH '.opt'"];
_OptionArray = [bundleDirectory filteredArrayUsingPredicate:Option];
_OptionPickerData = [_OptionArray copy];
Related
I'm trying to figure out how to populate a table from a JSON array. So far, I can populate my table cells perfectly fine by using the following code:
self.countries = [[NSArray alloc]initWithObjects:#"Argentina",#"China",#"Russia",nil];
Concerning the JSON, I can successfully retrieve one line of text at a time and display it in a label. My goal is to populate an entire table view from a JSON array. I tried using the following code, but it still won't populate my table. Obviously I'm doing something wrong, but I searched everywhere and still can't figure it out:
NSURL *url = [NSURL URLWithString:#"http://BlahBlahBlah.com/CountryList"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
{
NSLog(#"%#",[JSON objectForKey:#"COUNTRIES"]);
self.countries = [JSON objectForKey:#"COUNTRIES"];
}
failure:nil];
[operation start];
I am positive that the data is being retrieved, because the NSLog outputs the text perfectly fine. But when I try setting my array equal to the JSON array, nothing happens. I know the code is probably wrong, but I think I'm on the right track. Your help would be much appreciated.
EDIT:
This is the text in the JSON file I'm using:
{
"COUNTRIES": ["Argentina", "China", "Russia",]
}
-Miles
It seems that you need some basic JSON parsing. If you only target iOS 5.0 and above devices, then you should use NSJSONSerialization. If you need to support earlier iOS versions, then I really recommend the open source JSONKit framework.
Having recommended the above, I myself almost always use the Sensible TableView framework to fetch all data from my web service and automatically display it on a table view. Saves me a ton of manual labor and makes app maintenance a breeze, so it's probably something to consider too. Good luck!
I am trying to update an existing plist on iOS5 simulator but it fails miserably.
It finds the plist and retrieves existing information and updates the array but it does not write to file.
Any one would have any ideas?
NSString *path = [[NSBundle mainBundle] pathForResource:#"content_iPhone" ofType:#"plist"];
NSMutableArray *plist = [[NSMutableArray arrayWithContentsOfFile:path] mutableCopy];
// For testing purpose, get an object from the Array and add the object to array
newObject = [plist objectAtIndex:1];
[plist addObject:newObject];
[plist writeToFile:path atomically:YES];
You can't write to a file inside your app bundle, you can only read from it.
You could write the file to the user's Documents directory instead: look at
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
This returns an array, the first object of which will be the path to the user's Documents directory for your app. You could copy the file there the first time your app is run, and update it at that location in the future.
I am accessing a plist file using the code below on a Cocoa with Objective-C application:
NSString *plistPath = [#"~/Library/Preferences/com.apple.mail.plist" stringByExpandingTildeInPath];
NSDictionary *plistData = [NSDictionary dictionaryWithContentsOfFile:plistPath];
NSArray *item = [plistData valueForKeyPath:#"MailAccounts.AccountName"];
NSLog(#"Account: %#", [item objectAtIndex:2]);
Which essentially returns the email address of the user (we also read some other information on other plist files) so we can add it to the About dialog.
I need now to read this information from the same plist files using C, not Objective-C. The files are not text, they are binary encoded plist files. Is there any way to read those property files from C?
Can I call NSDictionary etc from C? How?
Thanks for the help.
Of course you realize that Objective C is an extension of C, but in general, when I'm using plain ol' C, I use Core Foundation functions and objects instead of Objective C methods.
To your specific question: CFDictionary is toll-free bridged to NSDictionary and CFBundle to NSBundle. You can easily call CoreFoundation from plain ol' C.
You can get what you want with something like:
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFDictionaryRef dictionaryRef = CFBundleGetInfoDictionary(mainBundle);
if(dictionaryRef)
{
CFArrayRef accountsItemsArrayRef = CFDictionaryGetValue(dictionaryRef, CFSTR("MailAccounts.AccountName");
if(accountsItemsArrayRef)
{
CFStringRef accountNameRef = (CFStringRef) CFArrayGetValueAtIndex(accountsItemsArrayRef, 2);
if(accountNameRef)
{
fprintf(stderr, "Account: %s", accountName.cStr());
}
}
}
I just typed this Core Foundation translation directly into this answer box and did no error or sanity checking, which you absolutely would need to do.
Here is a slightly older tutorial that explains a bit more.
Hope this helps to get you on the right path!
I have been attempting to use NSMutableArray's writeToFile:atomically:
But it has been pointed out to me that this approach is wrong: i.e. iPhone / Objective-C: NSMutableArray writeToFile won't write to file. Always returns NO
It looks like I'm going to have to read the guide on archiving that is referred to in one of the answers in the above link.
Would anyone care to share (or point me towards) some code that helps me accomplish this task?
The method, you've mentioned recursively validates that all the contained objects are property list objects before writing out the file.
Try this:
for (UIImage *image in arrayWithImages) {
NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:#"Documents/%#", #"nameOfTheImage.png"]];
UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];
}
Maybe you can use [UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES]; to write image as jpeg.
I have a .plist with 2 key values in it. It is of type Dictionary. I am trying to write value to one of the key values. What's wrong with the code below? I also tried using type "Array". That option also does not work. How can I get it to work using Dictionary & also Array? Anyone has working code example? Thanks. I would appreciate any help.
NSString *filePath = #"myprefs.plist";
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
[plistDict setValue:#"test#test.com" forKey:#"Email"];
[plistDict writeToFile:filePath atomically: YES];
You did not initialize the path properly.
If "myprefs.plist" is inside the resources folder of your project then initialize like this:
NSString *filePath = [[NSBundle mainBundle]pathForResource:#"myprefs" ofType:#"plist"];
If its somewhere else in your computer, specify the whole path