在UIPasteboard中存储NSArray [英] Storing NSArray in UIPasteboard

问题描述

我有几个文本文件，我想在2个应用程序之间传输. (即同一应用的免费和付费版本).

I have several text files which I want to transfer between 2 Apps. (ie. free and paid versions of the same App).

我正在使用UIPasteboard来执行此操作.这些文件的内容作为NSArray保存在内存中，因此我想将这些NSArray复制到粘贴板(精简版)，然后从粘贴板读取它们(完整版).

I'm using UIPasteboard to do this. The contents of the files are held in memory as NSArrays, and so I want to copy these NSArrays to the pasteboard (lite version), and read them from the pasteboard (full version).

由于某些原因，无法从粘贴板中读取数据.数据将作为NSData对象而不是NSArray返回，我认为这意味着它不是我正在使用的粘贴板类型的必需格式，即"public.utf8-plain-text".

For some reason the data cannot be read back from the pasteboard. The data is being returned as a NSData object, rather than NSArray, which I think means that it is not in the required format for the pasteboard type I am using, which is "public.utf8-plain-text".

当我使用这种粘贴板类型读取/写入NSString时，效果很好.

When I read/write NSStrings with this pasteboard type, it works fine.

我搜索了Apple文档等，以查看是否应该为NSArrays(或其他属性列表对象)使用其他类型，但画了一个空白.

I searched through Apple docs, etc, to see if there is a different type I should be using for NSArrays, (or other property list objects), but drew a blank.

写到粘贴板:(在下面的pDataOutput中是一个字符串数组，文件内容):

Writing to the pasteboard: (In the following pDataOutput is an array of strings, file contents) :

NSMutableArray *lArrayCopy = [gGlobalData.cPasteBoard.items mutableCopy];
[lArrayCopy replaceObjectAtIndex:pDataFileIdx
                  withObject:[NSDictionary dictionaryWithObject:pDataOutput
                                                         forKey:@"public.utf8-plain-text"]];
gGlobalData.cPasteBoard.items = lArrayCopy;
[lArrayCopy release];

从粘贴板上读取:

NSArray *lPBItems = [pPasteBoard valuesForPasteboardType:@"public.utf8-plain-text"
                                               inItemSet:nil];
NSLog(@"PB Items = NSArray of count %d", lPBItems.count);

以上返回:

PB Items = NSArray of count 0

如上所述，如果以NSString形式编写，它将以NSString形式正确返回数据.

As mentioned above, it returns the data correctly as NSStrings if written as NSStrings.

任何帮助将不胜感激. 谢谢 斯蒂芬·C

Any help would be very much appreciated. Thanks Stephen C

推荐答案

我遇到了同样的问题，我认为valueForPasteboardType系列方法已损坏，总是返回NSData. 这是我的解决方案:

I ran into the same issue and I think the valueForPasteboardType family of methods are broken and always return NSData. Here is my solution:

NSArray * lArrayFromPasteBoard = [pPasteBoard valueForPasteboardType:@"com.my.custom.type"];
if ([lArrayFromPasteBoard isKindOf:[NSData class]])
{
    lArrayFromPasteBoard = [[NSPropertyListSerialization propertyListWithData:(NSData*)lArrayFromPasteBoard options:0 format:0 error:0];
}

希望这会成功，以便一旦苹果修复了他们的错误后，if中的代码将不再被调用

hopefully this will make it so the code in the if won't get called anymore once apple fixes their bug

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