如何为我的iOS Cocos2d游戏保存游戏数据

Question

我有一堆与关卡相关的杂项数据，因此我需要保存，即使玩家关闭/打开手机、重新启动设备、退出游戏等，这些数据也会被保存。基本上是持久数据。我已经考虑了很多选择，但没有找到一个简单、明确的方法来满足我的需求，我希望有人能帮助我，并给出一个明确的例子，说明如何根据我的需求实施最佳方法。

我看过以下内容NSUSerDefaults(显然不是最好的，因为它是针对偏好的，所以我理解)NSCoder/NSKeyedArchiver(无法找到一个简单的方法来保存一个单一类中的简单数据类型，所有数据都保存为属性)SQLite3(完全丢失)

如有任何帮助和指导，我们将不胜感激。

我需要在整个程序中保存和轻松访问的数据类型是。。。NSString、NSArray、Ints、Bools。

谢谢你的帮助，我希望得到一个明确的答案！

Answer 1

保存到NSUserDefaults当然没有错，但如果您想将属性保存到磁盘，我已经为您整理了一些代码，用于保存到.plist文件，然后再进行检索。您也可以在本文中找到它。

正在保存

// 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);
}

正在加载

// 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];
}

如需进一步阅读，请参阅《归档和序列化编程指南》。