NSKeyedArchiver archivedDataWithRootObject: 的参数应该是我要保存的数组，还是转换为 NSData 的数组？
裕二的回答是对的。但更准确地说，您的数组元素必须实现协议并将您自己的代码填充到方法 initWithCoder: 和encodeWithCoder:
喜欢：
- (id)initWithCoder:(NSCoder *)decoder {
if (self = [super init]) {
self.title = [decoder decodeObjectForKey:@"title"];
self.author = [decoder decodeObjectForKey:@"author"];
self.published = [decoder decodeBoolForKey:@"published"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder {
[encoder encodeObject:title forKey:@"time"];
[encoder encodeObject:author forKey:@"author"];
[encoder encodeBool:published forKey:@"published"];
}
然后你可以使用 archiver 和 unchariver，例如：
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:notes];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"notes"];
NSData *notesData = [[NSUserDefaults standardUserDefaults] objectForKey:@"notes"];
NSArray *notes = [NSKeyedUnarchiver unarchiveObjectWithData:notesData];
更多内容，您可以参考“使用 NSCoding 归档 Objective-C 对象 http://soff.es/archiving-objective-c-objects-with-nscoding".
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