UIDocument不能保存?

问题描述

不管我尝试什么，这都行不通...

No matter what I try, this isn't working...

我正在尝试使用UIDocument在本地保存我的(文本)文件.当我创建文件(即未加载)时，它可以保存. 但是，如果我先打开然后加载文件，然后再保存，则文件将无法保存.

I am trying to use UIDocument to save my (text) files locally. When I create a file (i.e. it isn't loaded), it saves fine. However, if I load my file by opening it and then save it, it simply won't save.

编辑:当应用进入后台时，我尝试保存我的文档.但是，当我进入前台时，该应用程序似乎实际上完成了保存"文档.我的应用程序在后台时是否不允许保存文档?

EDIT: I try to save my documents when the app enters the background. However, it seems that the app actually "finishes saving" the documents when I enter the foreground. Is my app not allowed to save documents while in the background?

我检查了我的URL，它们都是有效的.

I've checked my URLs and they're all valid.

这是从头开始制作文档的代码:

Here is the code for making the document from scratch:

document = [[MyDocumentClass alloc] initWithFileURL:fileURL];

fileURL是先前制作的.加载时，我不会打开或创建它，只是在用户退出应用程序时保存它.

fileURL was made previously.When loading I don't open or create it, I simply save it when the user quits the app.

如果文件已经在磁盘上:

If the file already exists on disk:

以下是打开代码:

[document openWithCompletionHandler:^(BOOL success){
    if (!success) {
        NSLog(@"FAILED TO OPEN DOCUMENT");
    }

    // Code to handle document's data
}];

并保存:

[document saveToURL:[NSURL fileURLWithPath:path] forSaveOperation:UIDocumentSaveForOverwriting completionHandler:^(BOOL success){
    if (!success || document.documentState == UIDocumentStateSavingError) {
    NSLog(@"FAILED TO CLOSE DOCUMENT");
    }
}];

我的文档在contentsForType: error:中正确编码并提供了数据，因为它在初次创建时可以正确保存.

My document encodes and provides its data correctly in contentsForType: error:, given that it saves correctly when first being created.

我在handleError: userInteractionPermitted:中没有任何错误

有什么想法吗?

N.B.(我将数据保存在applicationDidEnterBackground:

saveToURL: forSaveOperation: completionHandler:的完成处理程序永远不会被调用...

And the completion handler for saveToURL: forSaveOperation: completionHandler: is never called...

推荐答案

您首先在某处创建了文档吗?

Have you first created the document somewhere?

例如，用于创建:

[document saveToURL:[NSURL fileURLWithPath:path] forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success){
    if (!success || document.documentState == UIDocumentStateSavingError) {
    NSLog(@"FAILED TO CLOSE DOCUMENT");
}
}];

并覆盖:

[document saveToURL:[NSURL fileURLWithPath:path] forSaveOperation: UIDocumentSaveForOverwriting completionHandler:^(BOOL success){
    if (!success || document.documentState == UIDocumentStateSavingError) {
    NSLog(@"FAILED TO CLOSE DOCUMENT");
}
}];

这篇关于UIDocument不能保存?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！