How to use NSMutable Dictionary in another class for read and write data from plist file in iphone....
Any Ideas?
As you can find in in NSDictionary reference, this class has a method to create a nsdictionary from a file initWithContentsOfFile:(NSString *)path . You can do something like:
NSString *plistPath = [[NSBundle mainBundle] pathForResource:#"myDictionary" ofType:#"plist"];
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
Where myDictionary is your plist name (In case of your plist is inside resource bundle).
You can write a plist on disk with the method:
[dict writeToFile:filePath atomically: YES];
Where filePath is your destination path.
See the Plist files example on this tutorial.
// Look in Documents for an existing plist file
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
myPlistPath = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"%#.plist", plistName] ];
[myPlistPath retain];
// If it's not there, copy it from the bundle
NSFileManager *fileManger = [NSFileManager defaultManager];
if ( ![fileManger fileExistsAtPath:myPlistPath] ) {
NSString *pathToSettingsInBundle = [[NSBundle mainBundle]
pathForResource:plistName ofType:#"plist"];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *path = [documentsDirectoryPath
stringByAppendingPathComponent:#"myApp.plist"];
NSMutableDictionary *plist = [NSDictionary dictionaryWithContentsOfFile: path];
myKey = (int)[[plist valueForKey:#"myKey"] intValue];
myKey2 = (bool)[[plist valueForKey:#"myKey2"] boolValue];
[plist setValue:myKey forKey:#"myKey"];
[plist writeToFile:path atomically:YES];
Related
I am creating a plist of dictionaries. The plist starts off as empty, and then I do this:
NSMutableArray *favouritesList = [[NSMutableArray alloc] initWithContentsOfFile:path];
[favouritesList addObject:thisPlace]; // where thisPlace is some NSDictionary
[favouritesList writeToFile:path atomically:YES];
When I immediately do:
NSArray *savedFav = [[NSArray alloc] initWithContentsOfFile:path];
NSLog(#"%#", savedFav);
I get an empty array. Why is this? Why isn't it writing properly? I am setting up the plist correctly, I debugged that. But I cannot add a dictionary to it.
The plist is just an empty plist with a root that's an array
EDIT:
Here is how I construct my path:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"favourites.plist"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:path]) {
NSString *sourcePath = [[NSBundle mainBundle] pathForResource:#"favourites" ofType:#"plist"];
[fileManager copyItemAtPath:sourcePath toPath:path error:nil];
}
I do something like below. I add an object using a key. Maybe that's why it's not working.
static NSMutableDictionary *dictionaryStore;
+(void)initialize{
if(dictionaryStore == nil){
dictionaryStore = [[NSMutableDictionary alloc] initWithContentsOfFile:[self getFilePath]];
if(dictionaryStore == nil)
dictionaryStore = [NSMutableDictionary new];
}
}
+(NSString *)getFilePath{
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *plistPath = [rootPath stringByAppendingPathComponent:#"filename.plist"];
return plistPath;
}
+(NSString *)getValueForKey:(NSString *)key{
[self initialize];
return [dictionaryStore objectForKey:key];
}
+(void)setValue:(NSString *)value forKey:(NSString *)key{
[self initialize];
[dictionaryStore setValue:value forKey:key];
}
+(BOOL)save{
[self initialize];
return [dictionaryStore writeToFile:[self getFilePath] atomically:YES];
}
Edit:
So to save a value, I do:
[WAStore setValue:myValue forKey:myKey];
BOOL isSuccessful = [WAStore save];
WAStore is the class name. myValue can be most data types (NSManagedObjectModels won't work). myKey is any NSString.
I have generated a property list which save some hospital names. Now I want to get the names into an array from that plist. please help me. Thanx in advance.
NSString* plistPath = [[NSBundle mainBundle] pathForResource:#"sample" ofType:#"plist"];
contentArray = [NSArray arrayWithContentsOfFile:plistPath];
try this
Try this
NSMutableDictionary* dictionary = [[[NSMutableDictionary alloc] init] autorelease];
NSError *error;
// Look in Documents for an existing plist file
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* metadataPlistPath = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"Metadata.plist"]];
[metadataPlistPath retain];
// If it's not there, copy it from the bundle
NSFileManager *fileManger = [NSFileManager defaultManager];
if ( ![fileManger fileExistsAtPath:metadataPlistPath] ) {
NSString *pathToSettingsInBundle = [[NSBundle mainBundle]
pathForResource:#"Metadata" ofType:#"plist"];
[fileManger copyItemAtPath:pathToSettingsInBundle toPath:metadataPlistPath error:&error];
}
//Now read the plist file from Documents
NSString* myPlistPath = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"Metadata.plist"] ];
dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:myPlistPath];
return dictionary;
}
//fetch the data based on key
- (NSMutableArray*) fetchMetadataArrayForKey:(NSString*)aKey {
NSMutableArray* arrCategories = [[[NSMutableArray alloc] init] autorelease];
NSMutableDictionary* dictionary = [self fetchMetadata];
arrCategories = [dictionary valueForKey:aKey];
return arrCategories;
}
I have write code like this in Viewdidload method. But it don't create file .plist.
I don't know whether code is wi8 or wrong. And where i have to write?
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; //2
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"data1.plist"]; //3
NSFileManager *fileManager = [NSFileManager defaultManager];
if ( ![fileManager fileExistsAtPath:path] ) {
NSString *pathToSettingsInBundle = [[NSBundle mainBundle]
pathForResource:#"data1" ofType:#"plist"];
}
You have just created a path to it, you should try loading it into a NSDictionary.
NSDictionary* mydictionary = [ NSDictionary dictionaryWithContentsOfFile: pathToSettingsInBundle];
Inside your if block add a second line
[fileManager copyItemAtPath:pathToSettingsInBundle toPath:path error:&error];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
plistpath = [[NSString alloc] initWithString:[documentsDirectory stringByAppendingPathComponent:#"Product.plist"]];
And then
[array writeToFile:path atomically:YES];
[Whatever [Array or Dictionary] you want to Write in Plist]
If it is still not creating the plist then check whether your array or dictionary must be empty.
I am using the method below to get an array from my plist and then increase a certain value by 1, then save it. However I log the array and the value doesn't actually go up each time.
In my plist, I have an array and in that number values, each one is set to 0. So every time I run this again it goes back to 0 it seems.
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:#"Words.plist"];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:finalPath];
NSMutableArray *errors = [dict objectForKey:[NSString stringWithFormat:#"Errors%d.%d", [[stageSelectionTable indexPathForSelectedRow] section] +1, [[stageSelectionTable indexPathForSelectedRow] row] +1]];
int a = [[errors objectAtIndex:wordIndexPath] intValue];
a += 1;
NSNumber *b = [NSNumber numberWithInt:a];
[errors replaceObjectAtIndex:wordIndexPath withObject:b];
[errors writeToFile:finalPath atomically:YES];
You can only write to a file in the documents-folder. You can't write to your bundle!
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"Namelist.plist"];
You can use NSFilemanager to copy your Plist-File to the documents-folder.
To get the path of your file:
- (NSString *)filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"MyFile.plist"];
return filePath;
}
To copy the file if it doesn't exist:
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:[self filePath]]) {
NSString *path = [[NSBundle mainBundle] pathForResource:#"MyFile" ofType:#"plist"];
[fileManager copyItemAtPath:path toPath:[self filePath] error:nil];
}
Now you can write your NSDictionary to the Documents-Directory:
[dict writeToFile:[self filePath] atomically:YES];
But you really need to update the array in the dict!
You are writing the array to disk, instead of the dictionary that the array originated from:
[dict writeToFile:finalPath atomically:YES];
Also, you will need to replace the Errors%d.%d object with the updated one before saving it:
[dict setObject:errors forKey:/* your formatted key*/];
Finally, as #mavrick3 pointed out, you cannot save files to your bundle, only to your application's documents directory.
I'm making a application where I need to store some information the user have provided. I try to use a .plist file to store the information, I found this:
NSString *filePath = #"/Users/Denis/Documents/Xcode/iPhone/MLBB/data.plist";
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
[plistDict setValue:#"Man" forKey:#"Gender"];
[plistDict writeToFile:filePath atomically: YES];
The problem is that the application will only work as long as I'm testing it in the iPhone simulator. I've tried this Changing Data in a Plist but without luck. I have also read something about that I need to add it to my bundle, but how?
New code:
- (IBAction)segmentControlChanged{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:#"data.plist"];
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];
if (Gender.selectedSegmentIndex == 0) {
[plistDict setObject:#"Man" forKey:#"Gender"];
[plistDict writeToFile:plistLocation atomically: YES];
}
else
{
[plistDict setObject:#"Women" forKey:#"Gender"];
[plistDict writeToFile:plistLocation atomically: YES];
}
}
I guess you have added your plist file to your resources folder in Xcode (where we place image, if not then you need to place that first). Resources data goes to [NSBundle mainBundle] by default and iOS does not allow us to change data inside bundle. So first you need to copy that file to Documents Directory.
Here is the code for copying file from NSBundle to the Documents directory.
- (NSString *)copyFileToDocumentDirectory:(NSString *)fileName {
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *documentDirPath = [documentsDir
stringByAppendingPathComponent:fileName];
NSArray *file = [fileName componentsSeparatedByString:#"."];
NSString *filePath = [[NSBundle mainBundle]
pathForResource:[file objectAtIndex:0]
ofType:[file lastObject]];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL success = [fileManager fileExistsAtPath:documentDirPath];
if (!success) {
success = [fileManager copyItemAtPath:filePath
toPath:documentDirPath
error:&error];
if (!success) {
NSAssert1(0, #"Failed to create writable txt file file with message \
'%#'.", [error localizedDescription]);
}
}
return documentDirPath;
}
Now you can use the returned documentDirPath to access that file and manipulate (Read/Write) over that.
The plist structure is:
<array>
<dict>key-value data</dict>
<dict>key-value data</dict>
</array>
Here is code to write data into plist file:
/* Code to write into file */
- (void)addToMyPlist {
// set file manager object
NSFileManager *manager = [NSFileManager defaultManager];
// check if file exists
NSString *plistPath = [self copyFileToDocumentDirectory:
#"MyPlistFile.plist"];
BOOL isExist = [manager fileExistsAtPath:plistPath];
// BOOL done = NO;
if (!isExist) {
// NSLog(#"MyPlistFile.plist does not exist");
// done = [manager copyItemAtPath:file toPath:fileName error:&error];
}
// NSLog(#"done: %d",done);
// get data from plist file
NSMutableArray * plistArray = [[NSMutableArray alloc]
initWithContentsOfFile:plistPath];
// create dictionary using array data and bookmarkKeysArray keys
NSArray *keysArray = [[NSArray alloc] initWithObjects:#"StudentNo", nil];
NSArray *valuesArray = [[NSArray alloc] initWithObjects:
[NSString stringWithFormat:#"1234"], nil];
NSDictionary plistDict = [[NSDictionary alloc]
initWithObjects:valuesArray
forKeys:keysArray];
[plistArray insertObject:poDict atIndex:0];
// write data to plist file
//BOOL isWritten = [plistArray writeToFile:plistPath atomically:YES];
[plistArray writeToFile:plistPath atomically:YES];
plistArray = nil;
// check for status
// NSLog(#" \n written == %d",isWritten);
}
Are you using that same path on your device? Apps on a device are sandboxed and can only read/write files in their documents directory. Grab that file path like this and append your plist name. This approach will also work on the simulator.
Try this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:#"myplist.plist"];