iphone - iOS 将字典从一个 plist 导入到另一个 plist

Question

我正在尝试让我的应用程序从电子邮件中将设置导入到自身中。这将起作用的方式是用户将向自己发送一个 settings.properties 文件，这实际上是一个看起来像这样的 plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Viewer</key>
    <array>
        <string>username</string>
        <string>password</string>
        <string>http://www.example.com</string>
        <string>/example</string>
        <string>urlparam=whatever</string>
    </array>
</dict>

我可以使用 NSLog 打开并正确读取文件，但我需要将 dictionary 导入到我的应用程序主 Data.plist 中而不覆盖已经存在的内容，然后从 Documents/Inbox 文件夹中删除导入的 plist。

任何线索都会很棒 :)

//编辑

我已经根据下面的评论更新了我的方法。它现在仅在文件 Data.plist 已存在于我的应用程序文档目录中时才有效。因此，如果它不存在，我需要创建它，然后添加到我的 .properties 文件中。

这是我目前使用的代码。

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
if (url){

        NSDictionary *openedDictionary = [NSDictionary dictionaryWithContentsOfURL:url];

        // get paths from root direcory
        NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
        // get documents path
        NSString *documentsPath = [paths objectAtIndex:0];
        // get the path to our Data/plist file
        NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
        NSDictionary *originalDictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath];

        NSMutableDictionary *newDictionary = [originalDictionary mutableCopy];
        for (NSString *key in openedDictionary) {
            if (!newDictionary[key]) {
                newDictionary[key] = openedDictionary[key];
            }
        }

        [newDictionary writeToFile:plistPath atomically:YES];

    }
    NSError *error = nil;
    if (![[NSFileManager defaultManager] removeItemAtURL:url error:&error]) {
        NSLog(@"error while deleting: %@", [error localizedDescription]);
    }
    return YES;
}

Answer 1

首先，如果你的数据结构是错误的。你有字典而不是数组来设置，它更具可读性，你解析它会更简单，不会出错。

我建议将您的文件编辑成这样

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>username</key>
    <string>username_value</string>
    <key>password</key>    
    <string>password_value</string>
    <key>url</key>
    <string>www.example.com</string>
    <key>url2</key>
    <string>/example</string>
    <key>urlparam</key>
    <string>urlparam=whatever</string>
</dict>

将 plist 转换为字典非常简单。

NSData* plistData = [source dataUsingEncoding:NSUTF8StringEncoding];
NSString *error;
NSPropertyListFormat format;
NSDictionary* plist = [NSPropertyListSerialization propertyListFromData:plistData mutabilityOption:NSPropertyListImmutable format:&format errorDescription:&error];

您应该阅读更多关于 Serializing a Property List 的内容

转换 plist 后，比较值并进行适当的更改并将字典写入 plist 文件。

这是代码片段:

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    if (url){

        NSDictionary *openedDictionary = [NSDictionary dictionaryWithContentsOfURL:url];

        // get paths from root direcory
        NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
        // get documents path
        NSString *documentsPath = [paths objectAtIndex:0];
        // get the path to our Data/plist file
        NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
        NSDictionary *originalDictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath];

        NSMutableDictionary *newDictionary = [originalDictionary mutableCopy];
        for (NSString *key in openedDictionary) {
            if (!newDictionary[key]) {
                newDictionary[key] = openedDictionary[key];
            }
        }

        [newDictionary writeToFile:plistPath atomically:YES];

    }
    NSError *error = nil;
    if (![[NSFileManager defaultManager] removeItemAtURL:url error:&error]) {
        NSLog(@"error while deleting: %@", [error localizedDescription]);
    }
    return YES;
}