I'm trying to modify a plist and saving the changes but it doesn't work:
here is my code:
NSString *myPath = [[NSBundle mainBundle] pathForResource:#"myPlist" ofType:#"plist"];
NSMutableDictionary *plistDict;
NSMutableArray *array = [[NSMutableArray alloc]initWithArray:[plistDict objectForKey:#"$objects"]];
for (int i =0 ; i <array.count; i++)
{
if ([[array objectAtIndex:i] isKindOfClass:[NSString class]])
{
if ([[array objectAtIndex:i] isEqualToString:#"myString"])
{
[[plistDict objectForKey:#"$objects"]replaceObjectAtIndex:i withObject:#"newString"];
}
}
}
NSString *root = #"/Users/myUser/Desktop/newPlist.plist";
[plistDict writeToFile:root atomically:YES];
the dictionary of the content is been modify and I don't have any errors but the file is never been created in the path. Any of you know what I'm doing wrong? or how can I fixed?
I suspect that you are writing to a Sandboxed location. Not actually to the users directory.
Refer the below code:-
NSMutableDictionary *plistDict=//assuming your data
NSString *root = #"/Users/home/Desktop/newPlist.plist";
if (![[NSFileManager defaultManager]fileExistsAtPath:root])//checking fileexist or not
{
//if not exist creating the same
[[NSFileManager defaultManager]createFileAtPath:root contents:nil attributes:nil];
[plistDict writeToFile:root atomically:YES];
}
else
{
[plistDict writeToFile:root atomically:YES];
}
Related
I have a multiple strings I would like to write to one plist using objective c. Can anyone please tell me exactly how to do this? I appreciate it
As H2CO3 hinted, you could use NSArray's writeToFile:atomically: method.
For example:
NSArray *arr = #[
#"my first string",
#"my second string",
#"and the last one"
];
[arr writeToFile:#"./out.plist" atomically:NO]; // Or YES depending on your needs
Here's one possibility:
// Create the path that you want to write your plist to.
NSError *error = nil;
NSURL *documentsURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:&error];
if (documentsURL == nil) {
NSLog(#"Error finding user documents in directory: %#", [error localizedDescription]);
return nil;
}
NSString *path = [[documentsURL path] stringByAppendingPathComponent:#"YourFile.plist"];
// Populate your strings and save to the plist specified in the above path.
NSString *kRoot = #"kRoot";
NSMutableDictionary *tempDict = [NSMutableDictionary dictionary];
tempDict[kRoot] = [NSMutableArray array];
[tempDict[kRoot] addObject:#"String 1"];
[tempDict[kRoot] addObject:#"String 2"];
[tempDict[kRoot] addObject:#"String 3"];
// Etc, add all your strings
if (![tempDict writeToFile:path atomically:YES])
{
NSLog(#"Error writing data to path %#", path);
}
This question already has answers here:
Working with data in iOS Apps (What to choose? NSData, CoreData, sqlite, PList, NSUserDefaults)
(2 answers)
Closed 9 years ago.
I've been struggling with this for ages now and I really need some good help here. :)
I have an app where I'm parsing a quite big JSON into appdelegate's didFinishLaunchingWithOptions.
My Model Objects are:
Tab:
NSString *title
NSMutableArray *categories
Category:
NSString *title
NSMutableArray *items
Item
NSString *title
NSString *description
UIImage *image
I need to save the data locally, cause the parsing takes about 15 seconds every time my app starts. I'm using the SBJSON framework.
Here's my code for parsing:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"json_template" ofType:#"json"];
NSString *contents = [NSString stringWithContentsOfFile: filePath encoding: NSUTF8StringEncoding error: nil];
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
NSMutableDictionary *json = [jsonParser objectWithString: contents];
tabs = [[NSMutableArray alloc] init];
jsonParser = nil;
for (NSString *tab in json)
{
Tab *tabObj = [[Tab alloc] init];
tabObj.title = tab;
NSDictionary *categoryDict = [[json valueForKey: tabObj.title] objectAtIndex: 0];
for (NSString *key in categoryDict)
{
Category *catObj = [[Category alloc] init];
catObj.name = key;
NSArray *items = [categoryDict objectForKey:key];
for (NSDictionary *dict in items)
{
Item *item = [[Item alloc] init];
item.title = [dict objectForKey: #"title"];
item.desc = [dict objectForKey: #"description"];
item.url = [dict objectForKey: #"url"];
if([dict objectForKey: #"image"] != [NSNull null])
{
NSURL *imgUrl = [NSURL URLWithString: [dict objectForKey: #"image"]];
NSData *imageData = [NSData dataWithContentsOfURL: imgUrl];
item.image = [UIImage imageWithData: imageData];
}
else
{
UIImage *image = [UIImage imageNamed: #"standard.png"];
item.image = image;
}
[catObj.items addObject: item];
}
[tabObj.categories addObject: catObj];
}
[tabs addObject: tabObj];
}
What is the best way of doing this? Using Core Data or NSFileManager?
If you have som code example too it will make me very happy.
This is the last thing i need to fix before the app is ready for app store and it just kills me! I can't solve this problem.
If you are working on iOS then you save a file to the Documents folder. On Mac OS X it would be in the Application Support folder. Since you are on iOS, read this answer for how to access the Documents folder.
All of the objects that you want to store should implement NSCoding. The above variables already do. Should you want to store the tabs, categories and items directly they would need to implement NSCoding. Then all you need is to serialize them to a file. When opening you app you can look for this file and get your objects back without parsing.
The code should look something like this (untested and error checking is ommited for brevity):
- (void) saveStateToDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
[fileMan removeItemAtPath:docPath error:&error];
// Create the dictionary with all the stuff you want to store locally
NSDictionary *state = #{ ... };
// There are many ways to write the state to a file. This is the simplest
// but lacks error checking and recovery options.
[NSKeyedArchiver archiveRootObject:state toFile:docPath];
}
- (NSDictionary*) stateFromDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
return [NSKeyedUnarchiver unarchiveObjectWithFile:docPath];
return nil;
}
I understand I can for instance write a value to a .plist file as such
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"stored" ofType:#"plist"];
NSString *comment = #"this is a comment";
[comment writeToFile:filePath atomically:YES];
But If i had for say an Array inside my .plist (gameArray) and I'd like to white comment into a particular index of my array i.e. gameArray[4] ; how would I do this ?
allow me to clarify
I have a plist: stored.plist
inside my plist there is an array gameArray
i would like to update specific indexes of gameArray inside the plist
is this possible ?
You cannot update and save data in application's main bundle instead you have to do in document directory or other directory like this:
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistFilePath = [documentsDirectory stringByAppendingPathComponent:#"stored.plist"];
if([[NSFileManager defaultManager] fileExistsAtPAth:plistFilePath])
{//already exits
NSMutableArray *data = [NSMutableArray arrayWithContentsOfFile:plistFilePath];
//update your array here
NSString *comment = #"this is a comment";
[data replaceObjectAtIndex:4 withObject:comment];
//write file here
[data writeToFile:plistFilePath atomically:YES];
}
else{ //firstly take content from plist and then write file document directory
NSString *plistPath = [[NSBundle mainBundle] pathForResource:#"stored" ofType:#"plist"];
NSMutableArray *data = [NSMutableArray arrayWithContentsOfFile:plistPath];
//update your array here
NSString *comment = #"this is a comment";
[data replaceObjectAtIndex:4 withObject:comment];
//write file here
[data writeToFile:plistFilePath atomically:YES];
}
Assuming the contents of 'stored.plist' is an array, you need to instantiate a mutable array from the path:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"stored" ofType:#"plist"];
NSMutableArray *array = [NSMutableArray arrayWithContentsOfFile:filePath];
NSString *comment = #"this is a comment";
// inserting a new object:
[array insertObject:comment atIndex:4];
// replacing an existing object:
// classic obj-c syntax
[array replaceObjectAtIndex:4 withObject:4];
// obj-c literal syntax:
array[4] = comment;
// Cannot save to plist inside your document bundle.
// Save a copy inside ~/Library/Application Support
NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask] objectAtIndex:0];
NSURL *arrayURL = [documentsURL URLByAppendingPathComponent:[filePath lastPathComponent]];
[array writeToURL:arrayURL atomically:NO];
Plist is copyed to documents directory if it doesn't exist.
If it already exists, I want to use the "Name" key from NSDictionary in bundleArray to find the matching NSDictionary in documentsArray.
When the match is found, I want to check for changes in the strings and replace them if there is a change.
If a match is not found it means this dictionary must be added to documents plist.
This is my code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self managePlist];
return YES;
}
- (void)managePlist {
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Objects.plist"];
NSString *bundle = [[NSBundle mainBundle] pathForResource:#"Objects" ofType:#"plist"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: path]) {
[fileManager copyItemAtPath:bundle toPath:path error:&error];
} else {
NSArray *bundleArray = [[NSArray alloc] initWithContentsOfFile:bundle];
NSMutableArray *documentArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
BOOL updateDictionary = NO;
for(int i=0;i<bundleArray.count;i++) {
NSDictionary *bundleDict=[bundleArray objectAtIndex:i];
BOOL matchInDocuments = NO;
for(int ii=0;ii<documentArray.count;ii++)
{
NSMutableDictionary *documentDict = [documentArray objectAtIndex:ii];
NSString *bundleObjectName = [bundleDict valueForKey:#"Name"];
NSString *documentsObjectName = [documentDict valueForKey:#"Name"];
NSRange range = [documentsObjectName rangeOfString:bundleObjectName options:NSCaseInsensitiveSearch];
if (range.location != NSNotFound) {
matchInDocuments = YES;
}
if (matchInDocuments) {
if ([bundleDict objectForKey:#"District"] != [documentDict objectForKey:#"District"]) {
[documentDict setObject:[bundleDict objectForKey:#"District"] forKey:#"District"];
updateDictionary=YES;
}
}
else {
[documentArray addObject:bundleDict];
updateDictionary=YES;
}
}
}
if(updateDictionary){
[documentArray writeToFile:path atomically:YES];
}
}
}
If I run my app now I get this message: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'
How can I fix this?
When this is fixed, do you think my code will work?
If not, I would be happy for some suggestions on how to do this. I have struggled for a while and really need to publish the update with the corrections! Thanks a lot for your help.
Presumably the documentDict is actually immutable. Even though you assign it to an NSMutableDictionary, this doesn't accurately describe the underlying data.
NSMutableDictionary *documentDict = [documentArray objectAtIndex:ii];
should be:
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithDictionary:[documentArray objectAtIndex:ii]];
and wherever you edit the documentDict, add:
[documentArray replaceObjectAtIndex:ii withObject:documentDict];
When you read a plist from file, an immutable dictionary/array with immutable children is created, so your
NSMutableDictionary *documentDict = [documentArray objectAtIndex:ii];
line is erfectively a lie - you don't have a mutable dictionary. To create a mutable object from a plist, have a look at CFPropertyListCreateWithData and specify kCFPropertyListMutableContainersAndLeaves as the mutability option.
This is my final and working code using the answer from James Webster. Thanks to H2CO3 as well for contribution.
- (void)managePlist {
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Object.plist"];
NSString *bundle = [[NSBundle mainBundle] pathForResource:#"Object" ofType:#"plist"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:path]) {
[fileManager copyItemAtPath:bundle toPath:path error:&error];
}
else
{
NSArray *bundleArray = [[NSArray alloc] initWithContentsOfFile:bundle];
NSMutableArray *documentArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
BOOL updateDictionary = NO;
for(int i=0;i<bundleArray.count;i++) {
NSDictionary *bundleDict=[bundleArray objectAtIndex:i];
for(int ii=0;ii<documentArray.count;ii++)
{
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithDictionary:[documentArray objectAtIndex:ii]];
NSString *bundleObjectName = [bundleDict valueForKey:#"Name"];
NSString *documentsObjectName = [documentDict valueForKey:#"Name"];
NSRange range = [documentsObjectName rangeOfString:bundleObjectName options:NSCaseInsensitiveSearch];
if (range.location != NSNotFound) {
NSString *districtString = [bundleDict objectForKey:#"District"];
if ([documentDict objectForKey:#"District"] != districtString) {
[documentDict setObject:districtString forKey:#"District"];
[documentArray replaceObjectAtIndex:ii withObject:documentDict];
updateDictionary=YES;
}
}
}
}
if(updateDictionary){
[documentArray writeToFile:path atomically:YES];
}
}
}
I want to create a NSArray from my app sandbox's documentsDirectory's includes. It includes so many files, but my array will only be by the ones ends with .MOV.
Can you help me?
Thank you!
There are a couple of options using the NSFileManager.
NSString *path = #"<dir_path>";
//Option 1 using directory enumerator
NSDirectoryEnumerator *direnum = [[NSFileManager defaultManager] enumeratorAtPath:path];
NSMutableArray *movfiles = [NSMutableArray array];
while(NSString *file = [direnum nextObject])
{
if([[file pathExtension] isEqualToString:#"MOV"])
[movfiles addObject:movfiles];
}
//Option 2 case insensitive using a predicate
NSError *error;
NSArray *dircontents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:&error];
if(error)
{
//Handle error
}
else
{
dircontents = [dircontents filteredArrayUsingPredicate:
[NSPredicate predicateWithFormat:#"pathExtension ==[c] %#", #"mov"]];
}