objective-c - iOS 12.0 替代使用已弃用的 archiveRootObject :toFile:

Question

使用 iOS 12，archiveRootObject:toFile:已被弃用。谁能建议一种简化的替代方法来将对象归档到文件中？

//Generic example of archiver prior to iOS 12.0    
-(BOOL) archive:(id)archiveObject withFileName:(NSString*)filename
{
    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    return [NSKeyedArchiver archiveRootObject:archiveObject toFile:path];
}

Answer 1

感谢@vadian 的提示，这是我在 iOS 12 下进行归档和取消归档的方法:

NSError *error = nil;

NSString *docsDir;
NSArray *dirPaths;

//Get the device's data directory:
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent:@"appData.data"]];

//Archive using iOS 12 compliant coding:
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:@"foo" requiringSecureCoding:NO error:&error];
[data writeToFile:databasePath options:NSDataWritingAtomic error:&error];
NSLog(@"Write returned error: %@", [error localizedDescription]);

//Unarchive the data:
NSData *newData = [NSData dataWithContentsOfFile:databasePath];
NSString *fooString = [NSKeyedUnarchiver unarchivedObjectOfClass:[NSString class] fromData:newData error:&error];