在我的应用程序中，我有一个用于集中存储我的应用程序数据的单例类。我还使用 nskeyarchiver 在此处加载和保存对象。我有一个管理类，我在其中创建了一系列使用 Singleton 类中的 sequenceCollection 初始化的 numbersequencer 实例。如果我修改存储在我的实例中的每个 evntSequencer 字典中的 self.sequence 和 self.times，则此处更改的值会反映在存储在 Singleton 中的源 sequenceCollection 中。我可以使用 NSkeyArchiver 保存并且写入的值是正确的。但是，如果我通过调用 Singleton 中的 loadProjectWithName 方法来更改值，则源 sequenceCollection 会更改，但是 evntSequencers 以及 numbersequencer 实例中的 self.sequence 和 self.times 不会更新并包含不同的值。我通过在 Management 类中添加 updateSequence 方法解决了这个问题。这一切都有效，但它不是特别优雅，我对为什么需要采取这一步有点困惑？
单人班
+(AppManager *)SharedAppManager{
static AppManager *_sharedAppManager;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_sharedTileManager = [[self alloc]init];
});
return _sharedAppManager;
}
+(id)alloc
{
{
NSAssert(_sharedAppManager == nil,@"Attempted to allocate a second instance of the
singleton");
_sharedAppManager = [super alloc];
return _sharedAppManager;
}
}
-(id)init
{
self = [super init];
if (self)
{
return self;
}
-(NSMutableDictionary *)collateProject {
NSMutableDictionary *projectDict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
self.sequenceCollection,@"sequences",nil];
// other project container not shown
return projectDict;
}
-(void)allocateSequencerStorage:(NSInteger)no {
if (self.sequenceCollection ==nil) {
self.sequenceCollection = [[NSMutableDictionary alloc]init];
for (int i = 0; i < no; i++) {
NSMutableArray *events = [[NSMutableArray alloc]init];
NSMutableArray *eventTimes = [[NSMutableArray alloc]init];
NSMutableDictionary *sequence = [[NSMutableDictionary alloc]initWithObjectsAndKeys:
events,@"events",eventTimes,@"eventtimes", nil];
[events release];
[eventTimes release];
[self.sequenceCollection setObject:sequence forKey:[NSString stringWithFormat:@"sequence%d",i]];
[sequence release];
}
}
}
//File Manager class not shown
-(void)loadProjectWithName:(NSString *)name {
id object = [FileManager loadFileWithName:name andPathID:kProjectFolder];
if ([object isKindOfClass:[NSMutableDictionary class]]) {
NSMutableDictionary *loadProject = object;
//
// SEQUENCES
if ([loadProject objectForKey:@"sequences"] != nil) {
self.sequenceCollection = [loadProject objectForKey:@"sequences"];
//notify loaded
}
用于管理编号排序器的管理类其他代码未显示
#define AppSingleton ((AppManager*)[AppManager sharedAppManager])
-(id)initWithNo:(unsigned int)seqcount andMaxChainLen:(unsigned int)length {
self = [super init];
if (self) {
//create our suite of sequencers
self.sequencers = [[NSMutableArray alloc]init];
// initiate central stores in singleton
[AppSingleton allocateSequencerStorage:seqcount];
for (int i = 0; i < seqcount; i++) {
[self.sequencers addObject:[[NumberSequence alloc]initForSequenceWithLen:length
andTag:i withStore:AppSingleton.sequenceCollection]];
[(NumberSequence*)[self.sequencers objectAtIndex:i]setDelegate:self];
}
}
return self;
}
//This is called after sequenceCollection is updated in Singleton
-(void)updateSequences:(NSNotification *)notification {
[self.sequencers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop)
{
if ([obj isKindOfClass:[NumberSequence class]]) {
NumberSequence *seq = obj;
seq.evnts = [AppSingleton.numberCollection objectForKey:[NSString
stringWithFormat:@"sequence%d",idx]];
seq.sequence = [seq.evnt objectForKey:@"events"];
seq.times = [seq.evnts objectForKey:@"eventTimes"];
}
}];
}
NUMBER SEQUENCE CLASS 其他方法未显示
- (id)initForSequenceWithLen:(unsigned int)seqlen andTag:(unsigned int)tag withStore:
(NSMutableDictionary *)store {
if (self = [super init]){
self.evntSequencer = store;
self.sequence = [self.evntSequencer objectForKey:@"events"];
self.times = [self.evntSequencer objectForKey:@"eventTimes"];
}
return self;