我在采用 NSSecureCoding 时遇到了麻烦。我对包含我的自定义类的对象的数组进行编码,该类NSSecureCoding
正确采用。当我解码它并传递类NSArray
(这是我编码的对象的类)时,它会引发异常。但是,当对字符串数组执行完全相同的操作时,它可以正常工作。我看不出我的班级和 NSString 有什么区别。
#import <Foundation/Foundation.h>
@interface Foo : NSObject <NSSecureCoding>
@end
@implementation Foo
- (id)initWithCoder:(NSCoder *)aDecoder {
return [super init];
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
}
+ (BOOL)supportsSecureCoding {
return YES;
}
@end
int main() {
@autoreleasepool {
NSMutableData* data = [[NSMutableData alloc] init];
NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:@[[Foo new]] forKey:@"foo"];
[archiver encodeObject:@[@"bar"] forKey:@"bar"];
[archiver finishEncoding];
NSKeyedUnarchiver* unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
unarchiver.requiresSecureCoding = YES;
// throws exception: 'value for key 'NS.objects' was of unexpected class 'Foo'. Allowed classes are '{( NSArray )}'.'
[unarchiver decodeObjectOfClass:[NSArray class] forKey:@"foo"];
// but this line works fine:
[unarchiver decodeObjectOfClass:[NSArray class] forKey:@"bar"];
[unarchiver finishDecoding];
}
return 0;
}