Ios NSUserDefaults与EXC_BAD_指令一起崩溃
我的应用程序因EXC_BAD_指令代码=EXC_i386_INVOP,子代码=0x0而崩溃。控制台记录lldb。我正在尝试将NSUserDefaults与NSKeyedArchiver和NSKeyedUnachiver一起使用。我试图序列化的类是NSManagedObject的一个子类,所以我不能直接序列化它,实际上我可以,但是我不能反序列化它,因为它需要一个NSManagedObject上下文。但实际上,如果有一种方法可以直接序列化类,请这样说= 为了解决这个问题,我创建了一个与对象具有相同属性的NSDictionary,然后将其序列化。以下是方法:Ios NSUserDefaults与EXC_BAD_指令一起崩溃,ios,swift,nsuserdefaults,nskeyedunarchiver,exc-bad-instruction,Ios,Swift,Nsuserdefaults,Nskeyedunarchiver,Exc Bad Instruction,我的应用程序因EXC_BAD_指令代码=EXC_i386_INVOP,子代码=0x0而崩溃。控制台记录lldb。我正在尝试将NSUserDefaults与NSKeyedArchiver和NSKeyedUnachiver一起使用。我试图序列化的类是NSManagedObject的一个子类,所以我不能直接序列化它,实际上我可以,但是我不能反序列化它,因为它需要一个NSManagedObject上下文。但实际上,如果有一种方法可以直接序列化类,请这样说= 为了解决这个问题,我创建了一个与对象具有相同属
var userDefaults: NSUserDefaults = NSUserDefaults.standardUserDefaults();
var data: NSData? = userDefaults.dataForKey(DefaultSessionProfileKey);
// Only saves if necessary
if data == nil {
var dict: NSDictionary = [
"firstName": profile.firstName,
"lastName": profile.lastName,
"nameFormat": profile.nameFormat,
"gender": profile.gender,
"birthday": profile.birthday,
"picture": profile.picture,
"uid": profile.uid
];
// Save the profile to user defaults
data = NSKeyedArchiver.archivedDataWithRootObject(dict);
userDefaults.setObject(data, forKey: DefaultSessionProfileKey);
}
然后做相反的事情。从标准用户默认值检索数据时,此代码在第二行崩溃:
var userDefaults: NSUserDefaults = NSUserDefaults.standardUserDefaults();
var data: NSData? = userDefaults.dataForKey(DefaultSessionProfileKey);
var profile: Profile?;
if data != nil {
// Unserialize the profile data. We must serialize/deserialize an NSDictionary instead of directly using a Profile instance because Profile is NSMutableObject, which means that it cannot exist without an NSManagedObjectContext. We don't have one for the serialization/deserialization process, so we generate this dictionary first
var dict = NSKeyedUnarchiver.unarchiveObjectWithData(data) as NSDictionary;
if dict != nil {
// Create the profile instance
var appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate;
var entity: NSEntityDescription = NSEntityDescription.entityForName("Profile", inManagedObjectContext: appDelegate.managedObjectContext);
var profile: Profile = Profile(entity: entity, insertIntoManagedObjectContext: appDelegate.managedObjectContext);
profile.firstName = dict.objectForKey("first_name") as String;
profile.lastName = dict.objectForKey("last_name") as String;
profile.nameFormat = dict.objectForKey("name_format") as String;
profile.gender = dict.objectForKey("gender") as String;
profile.birthday = dict.objectForKey("birthday") as NSDate;
profile.picture = dict.objectForKey("picture") as String;
profile.uid = dict.objectForKey("uid") as String;
}
else {
// A profile exists in user defaults, but it's not a valid profile, so we take the chance to clean up
userDefaults.removeObjectForKey(DefaultSessionProfileKey);
}
}
NSUserDefaults.dataForKey返回隐式展开的可选值。尝试更改您的第二行数据?到NSData!,或者完全删除该类型 另外,通常在使用NSKeyedArchiver时,您应该保存到磁盘,而不是NSUserDefault。默认值是一个键/值存储,因此无需将其归档到一个键中,只需使用data.writeToFile保存数据即可