Я пытаюсь сохранить пару массивов, используя NSUserDefaults. Я пытаюсь сделать все внутри appDelegate, когда приложение либо завершается, либо запускается. Однако мне трудно заставить его работать ... Я могу получить доступ к своим массивам (проектам, задачам и teamMembers) из любого другого класса приложения, включая возможность добавлять и удалять данные в них. Я знаю, что они работают, но я не могу сохранить данные и получить их снова. Хотя у меня есть некоторый объективный опыт, я никогда не пытался сохранить данные приложения. У кого-нибудь есть предложения? Вот код из моего AppDelegate
#import "AppDelegate.h"
@implementation AppDelegate
@synthesize window = _window;
@synthesize tasks;
@synthesize teamMembers;
@synthesize projects;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
tasks = [[NSMutableArray alloc]init];
tasks = [prefs objectForKey:@"tasks"];
NSLog(@"There are this many tasks in TASKS after the app loads %@", [tasks count]);
teamMembers = [prefs objectForKey:@"teamMembers"];
projects = [prefs objectForKey:@"projects"];
// Override point for customization after application launch.
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application
{
/*
Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
*/
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *theTasks = [[NSString alloc]initWithString:@"tasks"];
NSString *theTeamMembers = [[NSString alloc]initWithString:@"teamMembers"];
NSString *theProjects = [[NSString alloc]initWithString:@"projects"];
[prefs setObject:tasks forKey:theTasks];
[prefs setValue:teamMembers forKey:theTeamMembers];
[prefs setValue:projects forKey:theProjects];
[prefs synchronize];
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
/*
Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
*/
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *theTasks = [[NSString alloc]initWithString:@"tasks"];
NSString *theTeamMembers = [[NSString alloc]initWithString:@"teamMembers"];
NSString *theProjects = [[NSString alloc]initWithString:@"projects"];
[prefs setObject:tasks forKey:theTasks];
[prefs setValue:teamMembers forKey:theTeamMembers];
[prefs setValue:projects forKey:theProjects];
[prefs synchronize];
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
/*
Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
*/
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
tasks = [prefs objectForKey:@"tasks"];
teamMembers = [prefs objectForKey:@"teamMembers"];
projects = [prefs objectForKey:@"projects"];
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
/*
Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
*/
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
tasks = [prefs objectForKey:@"tasks"];
teamMembers = [prefs objectForKey:@"teamMembers"];
projects = [prefs objectForKey:@"projects"];
}
- (void)applicationWillTerminate:(UIApplication *)application
{
/*
Called when the application is about to terminate.
Save data if appropriate.
See also applicationDidEnterBackground:.
*/
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *theTasks = [[NSString alloc]initWithString:@"tasks"];
NSString *theTeamMembers = [[NSString alloc]initWithString:@"teamMembers"];
NSString *theProjects = [[NSString alloc]initWithString:@"projects"];
[prefs setObject:tasks forKey:theTasks];
[prefs setValue:teamMembers forKey:theTeamMembers];
[prefs setValue:projects forKey:theProjects];
[prefs synchronize];
}
@end