ios - 不推荐使用 initForReadingWithData - initForReadingFromData 返回 nil

Question

我有以下警告(Xcode 10.1 - iOS 12.1)

'initForReadingWithData:' is deprecated: first deprecated in iOS 12.0 - Use -initForReadingFromData:error: instead*

当我将方法更改为 initForReadingFromData 时，NSKeyedUnarchiver 返回 nil。

// Current code which produces the warning (but works fine) : 

NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

NSMutableArray *loadedCredentialIdentities = (NSMutableArray *)[unarchiver decodeObjectForKey:kStoredCredentialIdentities];

[unarchiver finishDecoding];

...

// using initForReadingFromData produces no warning (but doesn't work - loadedCredentialIdentities is nil) : 


NSError *error = nil;
NSKeyedUnarchiver *unarchiver = unarchiver = [[NSKeyedUnarchiver    alloc] initForReadingFromData:data error:&error];

NSMutableArray *loadedCredentialIdentities = (NSMutableArray *)[unarchiver decodeObjectForKey:kStoredCredentialIdentities];

[unarchiver finishDecoding];

Answer 1

关闭 secureCoding 解决了这个问题。

[[NSKeyedUnarchiver alloc] initForReadingFromData:data error:&error]; 

unarchiver.requiresSecureCoding = NO;

[unarchiver decodeObjectForKey:...] 

如果您不必向后兼容，最好不要关闭 secureCoding