我想保留一个 NSDictionary,里面装满了自定义对象到光盘:
NSDictionary *menuList = [[NSMutableDictionary alloc]initWithDictionary:xmlParser.items];
//here the "Menu List"`s Object are filled correctly
//persisting them to disc:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *directory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithUTF8String:MENU_LIST_NAME];
NSString *filePath = [directory stringByAppendingPathComponent:fileName];
//saving using NSKeyedArchiver
NSData* archiveData = [NSKeyedArchiver archivedDataWithRootObject:menuList];
[archiveData writeToFile:filePath options:NSDataWritingAtomic error:nil];
//here the NSDictionary has the correct amount of Objects, but the Objects` class members are partially empty or nil
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSDictionary *theMenu = (NSDictionary*)[NSKeyedUnarchiver unarchiveObjectWithData:data];
这里是自定义对象的 .m(存储在 NSDictionary 中的对象类型)
- (id)initWithTitle:(NSString*)tTitle level:(NSString*)tLevel state:(NSString*)tState visible:(BOOL)tVisible link:(NSString*)tLink linkType:(NSString*)tLinkType anId:(NSString*)tId {
if ((self = [super init])) {
self.anId = tId;
self.title = tTitle;
self.level = tLevel;
self.state = tState;
self.visible = tVisible;
self.link = tLink;
self.linkType = tLinkType;
}
return self;
}
- (void) encodeWithCoder:(NSCoder *)encoder {
[encoder encodeObject:self.anId forKey:@"anId"];
[encoder encodeObject:self.level forKey:@"level"];
[encoder encodeObject:self.state forKey:@"state"];
[encoder encodeBool:self.visible forKey:@"visible"];
[encoder encodeObject:self.title forKey:@"title"];
[encoder encodeObject:self.link forKey:@"link"];
[encoder encodeObject:self.linkType forKey:@"linkType"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if(self == [super init]){
self.anId = [decoder decodeObjectForKey:@"anId"];
self.level = [decoder decodeObjectForKey:@"level"];
self.state = [decoder decodeObjectForKey:@"state"];
self.visible = [decoder decodeBoolForKey:@"visible"];
self.title = [decoder decodeObjectForKey:@"title"];
self.link = [decoder decodeObjectForKey:@"link"];
self.linkType = [decoder decodeObjectForKey:@"linkType"];
}
return self;
}
@end
我不知道为什么对象未正确归档,但对象的成员在某处丢失。我认为 NSCoding 方法中的某个地方一定有错误,但我找不到它,非常感谢任何帮助。