我创建了一个简单的 plist 文件,其中包含一些我正在编写的纸牌游戏的用户偏好。我还创建了一个控制器来读取和写入这个 plist 文件,它是一个单例。一切正常,但经过几次尝试后它停止工作。将值记录到控制台它会显示返回值 0 的列表,这会导致我的应用程序崩溃我已经删除了 plist 并创建了一个新的,然后是相同的故事,可以正常工作 2 或 3 次,然后繁荣为零。
这是控制器singelton代码的副本:
@implementation userOptionsController
static userOptionsController* _sharedOptionsController = nil;
@synthesize backgroundSound=_backgroundSound;
@synthesize soundEffects = _soundEffects;
@synthesize coach = _coach;
@synthesize numberOfDecks = _numberOfDecks ;
+(userOptionsController*)sharedOptionsController{
@synchronized([userOptionsController class])
{
if(!_sharedOptionsController)
[[self alloc]init];
return _sharedOptionsController;
}
return nil;
}
+(id)alloc
{
@synchronized ([userOptionsController class])
{
NSAssert(_sharedOptionsController == nil, @"Attempted to allocate a second instance of userOptionsController singleton");
_sharedOptionsController = [super alloc];
return _sharedOptionsController;
}
return nil;
}
- (id) init {
self = [super init];
if (self) {
}
return self;
}
-(void)readPlistFile
{
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"playerPrefOptions.plist"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: path])
{
NSString *bundle = [[NSBundle mainBundle] pathForResource:@"playerPrefOptions" ofType:@"plist"];
[fileManager copyItemAtPath:bundle toPath: path error:&error];
}
NSMutableDictionary *temp = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
self.backgroundSound = [[temp objectForKey:@"backgroundSounds"]boolValue];
self.soundEffects = [[temp objectForKey:@"soundEffects"]boolValue];
self.coach =[[temp objectForKey:@"coach"]boolValue];
self.numberOfDecks = [[temp objectForKey:@"numberOfDecks"]intValue];
}
-(void)writeOptionsToFile
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"playerPrefOptions.plist"];
NSMutableDictionary *infoDict = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
NSNumber *moshe = [NSNumber numberWithInt:self.numberOfDecks];
[infoDict setObject: moshe forKey:@"numberOfDecks"];
[infoDict setObject:[NSNumber numberWithBool:self.coach] forKey:@"coach"];
[infoDict setObject:[NSNumber numberWithBool:self.backgroundSound] forKey:@"backgroundSounds"];
[infoDict setObject:[NSNumber numberWithBool:self.soundEffects] forKey:@"soundEffects"];
[infoDict writeToFile:path atomically:YES];
}
@end
所以属性:
int numberOfDecks =[userOptionsController sharedOptionsController].numberOfDecks;
将返回零。
有任何想法吗?
谢谢。