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POhow to maintain a plist so you dont lose your values
 

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  1. POhow to maintain a plist so you dont lose your values
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    <p>I have a plist which I read from my bundle into a new plist object that I put in the root directory for reading and writing. My question is what do I do with this or what dose the application do when its quit, and better yet what happens when the app is killed from the "multi task" menu from ios.</p> <p>Also is there a way to save this plist to memory/the bundle for future use when the application is used again.</p> <p>My code is as follows for refrence.</p> <p>Here is my .h</p> <pre><code> #import &lt;Foundation/Foundation.h&gt; @interface EngineProperties : NSObject { NSString *signature; NSNumber *version; NSNumber *request; NSNumber *dataVersion; NSMutableDictionary *cacheValue; //cachevalue Items NSNumber *man; NSNumber *mod; NSNumber *sub; } @property (copy, nonatomic) NSString *signature; @property (copy, nonatomic) NSNumber *version; @property (copy, nonatomic) NSNumber *request; @property (copy, nonatomic) NSNumber *dataVersion; @property (copy, nonatomic) NSMutableDictionary *cacheValue; //cachevalue Items @property (copy, nonatomic) NSNumber *man; @property (copy, nonatomic) NSNumber *mod; @property (copy, nonatomic) NSNumber *sub; //Singletton + (id)sharedManager; - (void) saveData:(NSString *)methodName signature:(NSString *)pSignature Version:(NSNumber *)pVersion request:(NSNumber *)rNumber dataVersion:(NSNumber *)dvReturned cacheValue:(NSNumber *)cValue; @end </code></pre> <p>and Here is my .m</p> <pre><code> #import "EngineProperties.h" static EnginePropertiesController *sharedMyManager = nil; @implementation EngineProperties @synthesize signature; @synthesize version; @synthesize request; @synthesize dataVersion; @synthesize cacheValue; @synthesize man; @synthesize mod; @synthesize sub; #pragma mark Singleton Methods + (id)sharedManager { @synchronized(self) { if (sharedMyManager == nil) sharedMyManager = [[self alloc] init]; } return sharedMyManager; } - (id)init { if (self = [super init]) { // Data.plist code // get paths from root direcory NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); // get documents path NSString *documentsPath = [paths objectAtIndex:0]; // get the path to our Data/plist file NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"EngineProperties.plist"]; // check to see if Data.plist exists in documents if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) { // if not in documents, get property list from main bundle plistPath = [[NSBundle mainBundle] pathForResource:@"EngineProperties" ofType:@"plist"]; } // read property list into memory as an NSData object NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath]; NSString *errorDesc = nil; NSPropertyListFormat format; // convert static property liost into dictionary object NSDictionary *tempRoot = (NSMutableDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&amp;format errorDescription:&amp;errorDesc]; if (!tempRoot) { NSLog(@"Error reading plist: %@, format: %d", errorDesc, format); } // assign values self.signature = [tempRoot objectForKey:@"Signature"]; self.version = [tempRoot objectForKey:@"Version"]; self.request = [tempRoot objectForKey:@"Request"]; self.dataVersion = [tempRoot objectForKey:@"Data Version"]; man = [cacheValue objectForKey:@"Man"]; mod = [cacheValue objectForKey:@"Mod"]; sub = [cacheValue objectForKey:@"SubMod"]; cacheValue = [tempRoot objectForKey:@"Cache Value"]; } - (void) saveData:(NSString *)methodName signature:(NSString *)pSignature Version:(NSNumber *)pVersion request:(NSNumber *)rNumber dataVersion:(NSNumber *)dvReturned cacheValue:(NSNumber *)cValue; { // get paths from root direcory NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); // get documents path NSString *documentsPath = [paths objectAtIndex:0]; // get the path to our Data/plist file NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"EngineProperties.plist"]; // set the variables to the values in the text fields self.signature = pSignature; self.version = pVersion; self.request = rNumber; self.dataVersion = dvReturned; //do some if statment stuff here to put the cache in the right place or what have you. if (methodName == @"manufacturers") { self.man = cValue; } else if (methodName == @"models") { self.mod = cValue; } else if (methodName == @"subMod") { self.sub = cValue; } self.cacheValue = [NSDictionary dictionaryWithObjectsAndKeys: man, @"Manufacturers", mod, @"Models", sub, @"SubModels", nil]; NSDictionary *plistDict = [NSDictionary dictionaryWithObjectsAndKeys: signature, @"Signature", version, @"Version", request, @"Request", dataVersion, @"Data Version", cacheValue, @"Cache Value", nil]; NSString *error = nil; // create NSData from dictionary NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&amp;error]; // check is plistData exists if(plistData) { // write plistData to our Data.plist file [plistData writeToFile:plistPath atomically:YES]; NSString *myString = [[NSString alloc] initWithData:plistData encoding:NSUTF8StringEncoding]; // NSLog(@"%@", myString); } else { NSLog(@"Error in saveData: %@", error); // [error release]; } } @end </code></pre>
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