我以为我知道是什么导致了这个错误，但我似乎不知道我做错了什么。
以下是我得到的完整错误信息:
Attempt to set a non-property-list object (
"<BC_Person: 0x8f3c140>"
) as an NSUserDefaults value for key personDataArray
我有一个Person类，我认为它符合NSCoding协议，在我的Person类中我有这两个方法:
- (void)encodeWithCoder:(NSCoder *)coder {
[coder encodeObject:self.personsName forKey:@"BCPersonsName"];
[coder encodeObject:self.personsBills forKey:@"BCPersonsBillsArray"];
}
- (id)initWithCoder:(NSCoder *)coder {
self = [super init];
if (self) {
self.personsName = [coder decodeObjectForKey:@"BCPersonsName"];
self.personsBills = [coder decodeObjectForKey:@"BCPersonsBillsArray"];
}
return self;
}
在应用程序的某个地方，NSString在BC_PersonClass中被设置，我有一个DataSave类，我认为它在处理BC_PersonClass中的属性编码。
下面是我从DataSave类中使用的代码:
- (void)savePersonArrayData:(BC_Person *)personObject
{
// NSLog(@"name of the person %@", personObject.personsName);
[mutableDataArray addObject:personObject];
// set the temp array to the mutableData array
tempMuteArray = [NSMutableArray arrayWithArray:mutableDataArray];
// save the person object as nsData
NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:personObject];
// first add the person object to the mutable array
[tempMuteArray addObject:personEncodedObject];
// NSLog(@"Objects in the array %lu", (unsigned long)mutableDataArray.count);
// now we set that data array to the mutable array for saving
dataArray = [[NSArray alloc] initWithArray:mutableDataArray];
//dataArray = [NSArray arrayWithArray:mutableDataArray];
// save the object to NS User Defaults
NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
[userData setObject:dataArray forKey:@"personDataArray"];
[userData synchronize];
}
我希望这些代码足够让您了解我正在尝试做什么。
再次，我知道我的问题在于我是如何编码我的属性在我的BC_Person类，我似乎不能弄清楚什么，虽然我做错了。
谢谢你的帮助!
您发布的代码尝试将一个自定义对象数组保存到NSUserDefaults中。你不能这么做。实现NSCoding方法没有帮助。你只能在NSUserDefaults中存储像NSArray, NSDictionary, NSString, NSData, NSNumber和NSDate这样的东西。
你需要将对象转换为NSData(就像你在一些代码中那样)，并将NSData存储在NSUserDefaults中。如果需要，你甚至可以存储NSData的NSArray。
当你读回数组时，你需要解压缩NSData来得到你的BC_Person对象。
也许你想要这样:
- (void)savePersonArrayData:(BC_Person *)personObject {
[mutableDataArray addObject:personObject];
NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:mutableDataArray.count];
for (BC_Person *personObject in mutableDataArray) {
NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:personObject];
[archiveArray addObject:personEncodedObject];
}
NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
[userData setObject:archiveArray forKey:@"personDataArray"];
}
Swift 3解决方案
简单实用程序类
class ArchiveUtil {
private static let PeopleKey = "PeopleKey"
private static func archivePeople(people : [Human]) -> NSData {
return NSKeyedArchiver.archivedData(withRootObject: people as NSArray) as NSData
}
static func loadPeople() -> [Human]? {
if let unarchivedObject = UserDefaults.standard.object(forKey: PeopleKey) as? Data {
return NSKeyedUnarchiver.unarchiveObject(with: unarchivedObject as Data) as? [Human]
}
return nil
}
static func savePeople(people : [Human]?) {
let archivedObject = archivePeople(people: people!)
UserDefaults.standard.set(archivedObject, forKey: PeopleKey)
UserDefaults.standard.synchronize()
}
}
模型类
class Human: NSObject, NSCoding {
var name:String?
var age:Int?
required init(n:String, a:Int) {
name = n
age = a
}
required init(coder aDecoder: NSCoder) {
name = aDecoder.decodeObject(forKey: "name") as? String
age = aDecoder.decodeInteger(forKey: "age")
}
public func encode(with aCoder: NSCoder) {
aCoder.encode(name, forKey: "name")
aCoder.encode(age, forKey: "age")
}
}
如何打电话
var people = [Human]()
people.append(Human(n: "Sazzad", a: 21))
people.append(Human(n: "Hissain", a: 22))
people.append(Human(n: "Khan", a: 23))
ArchiveUtil.savePeople(people: people)
let others = ArchiveUtil.loadPeople()
for human in others! {
print("name = \(human.name!), age = \(human.age!)")
}
