ios – iCloud – 如何保存包含自定义对象数组的存档

@property (nonatomic,copy) NSString    *name;
@property (nonatomic,copy) NSString    *dateCreated;
@property (nonatomic,copy) NSString    *desc;
@property (nonatomic,copy) NSString    *url;

self.list = [[NSMutableArray alloc] init];
Snippet *newEntry = [[Snippet alloc] init];
[self.list addObject:newEntry];

example in the docs确实显示了一个只有一个字符串的UIDocument子类,但它从-contentsForType返回一个NSData：error：.您可以使用NSKeyedArchiver在NSData中存储任意数量的对象.阅读 Serializing Objects以了解如何使用NSKeyedArchiver编码对象(并继续阅读以了解如何将它们取回！).

以您的房产为例……

@interface MyDocument : UIDocument
{
}
@property (nonatomic,copy) NSString    *url;
@end

@implementation MyDocument

//...

- (id)contentsForType:(NSString *)typename error:(NSError **)outError
{
    NSMutableData *data = [NSMutableData data];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWriTingWithMutableData:data];
    [archiver encodeObject:name forKey:@"name"];
    [archiver encodeObject:dateCreated forKey:@"created"];
    [archiver encodeObject:desc forKey:@"desc"];
    [archiver encodeObject:url forKey:@"url"];
    [archiver finishEncoding];
    // release archiver if you're not using ARC
    return data;
}
@end;

警告：我没有编译上面的代码,所以没有保证.这应该作为一个示例来说明如何使用归档程序将多个对象存储在单个数据对象中,您可以将其作为文档的内容返回.