[iOS Dev] NSUserDefaults Save/Read/Clear 儲存/讀取/清除 速記

	// 定義名稱 define key
	#define kIsActive @"isActive"
	#define kUserName @"userName"
	// 讀取資料
	-(void)loadInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	NSLog(@"Name : %@", [defaults stringForKey:kUserName]);
	NSLog(@"isActive : %@", ([defaults boolForKey:kIsActive] ? @"YES" : @"NO"));
	}
	// 儲存資料
	-(void)saveInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	NSString *userName = @"Hank";
	BOOL isActive = YES;
	[defaults setObject:userName forKey:kUserName];
	[defaults setBool:isActive forKey:kIsActive];
	}
	// 清除資料
	-(void)clearInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	[defaults removeObjectForKey:kUserName];
	[defaults removeObjectForKey:kIsActive];
	}
	// 執行
	- (void)viewDidLoad
	{
	[super viewDidLoad];
	[self saveInfo];
	[self loadInfo];
	[self clearInfo];
	[self loadInfo];
	}

view raw NSUserDefaultsSample.m hosted with ❤ by GitHub

參考: NSUserDefaults Class Reference