NSUserDefaults에 저장하는 데는 아무런 문제가 없지만 디스크에 속성을 저장하려면 .plist 파일로 저장 한 다음 나중에 검색 할 수 있도록 몇 가지 코드를 작성해야합니다. 이 gist에서도 찾을 수 있습니다.
// Fetch NSDictionary containing possible saved state
NSString *errorDesc = nil;
NSPropertyListFormat format;
NSString *plistPath;
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES) objectAtIndex:0];
plistPath = [rootPath stringByAppendingPathComponent:@"SavedState.plist"];
NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
NSDictionary *unarchivedData = (NSDictionary *)[NSPropertyListSerialization
propertyListFromData:plistXML
mutabilityOption:NSPropertyListMutableContainersAndLeaves
format:&format
errorDescription:&errorDesc];
// If NSDictionary exists, look to see if it holds a saved game state
if (!unarchivedData)
{
NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);
}
else
{
// Load property list objects directly
NSString *myString = [unarchivedData objectForKey:@"MyString"];
// Load primitives
NSNumber *boolValue = [unarchivedData objectForKey:@"SomeBoolValue"];
BOOL someBool = [boolValue boolValue];
NSNumber *integerValue = [unarchivedData objectForKey:@"SomeIntegerValue"];
BOOL someBool = [integerValue integerValue];
// Load your custom objects that conform to NSCoding
NSData *someObjectData = [unarchivedData objectForKey:@"SomeObject"];
MyClass *someObject = [NSKeyedUnarchiver unarchiveObjectWithData:someObjectData];
}
// We're going to save the data to SavedState.plist in our app's documents directory
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *plistPath = [rootPath stringByAppendingPathComponent:@"SavedState.plist"];
// Create a dictionary to store all your data
NSMutableDictionary *dataToSave = [NSMutableDictionary dictionary];
// Store any NSData, NSString, NSArray, NSDictionary, NSDate, and NSNumber directly. See "NSPropertyListSerialization Class Reference" for more information.
NSString *myString = @"Hello!"
[dataToSave setObject:myString forKey:@"MyString"];
// Wrap primitives in NSValue or NSNumber objects. Here are some examples:
BOOL someBool = YES;
NSNumber *boolValue = [NSNumber numberWithBool:someBool];
[dataToSave setObject:boolValue forKey:@"SomeBoolValue"];
int someInteger = 99;
NSInteger *integerValue = [NSNumber numberWithInteger:someInteger];
[dataToSave setObject:integerValue forKey:@"SomeIntegerValue"];
// Any objects that conform to NSCoding can be archived to an NSData instance. In this example, MyClass conforms to NSCoding.
MyClass *someObject = [[MyClass alloc] init];
NSData *archivedStateOfSomeObject = [NSKeyedArchiver archivedDataWithRootObject:someObject];
[dataToSave setObject:archivedStateOfSomeObject forKey:@"SomeObject"];
// Create a serialized NSData instance, which can be written to a plist, from the data we've been storing in our NSMutableDictionary
NSString *errorDescription;
NSData *serializedData = [NSPropertyListSerialization dataFromPropertyList:dataToSave
format:NSPropertyListXMLFormat_v1_0
errorDescription:&errorDescription];
if(serializedData)
{
// Write file
NSError *error;
BOOL didWrite = [serializedData writeToFile:plistPath options:NSDataWritingFileProtectionComplete error:&error];
NSLog(@"Error while writing: %@", [error description]);
if (didWrite)
NSLog(@"File did write");
else
NSLog(@"File write failed");
}
else
{
NSLog(@"Error in creating state data dictionary: %@", errorDescription);
}
저장.
NSUserDefaults는 완벽 할 것입니다. 저장하는 데이터의 양에 대한 올바른 저장 옵션입니다. – MaxGabriel
고맙습니다. NSUserDefaults는 단순함 때문에 끝났지 만 저장하지는 않습니다. 다른 저장 방법에 대한 코드 오버 헤드는 데이터가 얼마나 간단한 지 이해할 수 없습니다. –