您可以在Settings.bundle默认设置，即使您没有打开设置应用程序 [英] Can you make the settings in Settings.bundle default even if you don't open the Settings App

问题描述

我有一个带有settings.bundle的iPhone应用程序，可处理我的应用程序的各种设置。我可以在我的root.plist文件中设置默认值（使用DefaultValue属性），但这些只在用户第一次打开设置应用程序时使用。有什么办法可以在应用程序安装时写出这些值吗？我知道我可以写代码检查我的应用程序的第一次启动，然后写出来，但是他们在两个不同的地方。

I have an iPhone application with a settings.bundle that handles various settings for my application. I can set default values in my root.plist file (using the DefaultValue property), but these only get used the first time the user opens the settings app. Is there any way to get these values written out when your application installs? I know I can just write code that checks for the first launch of my app and then write them out, but then they are in two different places.

这里是一个条目以我的root.plist为例：

Here is an entry from my root.plist as an example:

<dict>
    <key>Type</key>
    <string>PSToggleSwitchSpecifier</string>
    <key>Title</key>
    <string>Open To Top Location</string>
    <key>Key</key>
    <string>open_top_location</string>
    <key>DefaultValue</key>
    <string>YES</string>
    <key>TrueValue</key>
    <string>YES</string>
    <key>FalseValue</key>
    <string>NO</string>
</dict>

最后的结果应该是，如果我请求'open_to_top_location'，我得到一个YES，

The end result should be that if I ask for 'open_to_top_location' I get a YES, instead of it not being there at all until the first time the user opens the Settings app.

任何想法？

推荐答案

如果我正确理解你，你想避免默认值指定两次（在Settings.bundle / Root.plist文件中一次为DefaultValue键，在应用程序初始化代码中为一次）因此您不必保持它们同步。

If I understood you correctly, you want to avoid having default values specified twice (once as "DefaultValue" keys in your Settings.bundle/Root.plist file, and once in your app initialization code) so you do not have to keep them in sync.

由于Settings.bundle存储在应用程序包本身中，您可以只读取默认值。我把一些示例代码放在一起，看看设置包，并读取每个键的默认值。注意，这不写出默认键;如果他们不存在，你需要在每次发布时阅读和注册它们（随时改变）。我只做了一些粗略的测试，所以确保它适用于所有情况下。

Since Settings.bundle is stored within the app bundle itself, you can just read the default values given there. I put together some sample code that looks at the Settings bundle and reads the default values for every key there. Note that this does not write out the default keys; if they don't exist, you'll need to read and register them at every launch (feel free to change this). I've only done some cursory tests, so make sure it works for you in all cases.

- (void)applicationDidFinishLaunching:(UIApplication *)application {    
    NSString *name = [[NSUserDefaults standardUserDefaults] stringForKey:@"name"];
    NSLog(@"name before is %@", name);

    // Note: this will not work for boolean values as noted by bpapa below.
    // If you use booleans, you should use objectForKey above and check for null
    if(!name) {
        [self registerDefaultsFromSettingsBundle];
        name = [[NSUserDefaults standardUserDefaults] stringForKey:@"name"];
    }
    NSLog(@"name after is %@", name);
}

- (void)registerDefaultsFromSettingsBundle {
    NSString *settingsBundle = [[NSBundle mainBundle] pathForResource:@"Settings" ofType:@"bundle"];
    if(!settingsBundle) {
        NSLog(@"Could not find Settings.bundle");
        return;
    }

    NSDictionary *settings = [NSDictionary dictionaryWithContentsOfFile:[settingsBundle stringByAppendingPathComponent:@"Root.plist"]];
    NSArray *preferences = [settings objectForKey:@"PreferenceSpecifiers"];

    NSMutableDictionary *defaultsToRegister = [[NSMutableDictionary alloc] initWithCapacity:[preferences count]];
    for(NSDictionary *prefSpecification in preferences) {
        NSString *key = [prefSpecification objectForKey:@"Key"];
        if(key && [[prefSpecification allKeys] containsObject:@"DefaultValue"]) {
            [defaultsToRegister setObject:[prefSpecification objectForKey:@"DefaultValue"] forKey:key];
        }
    }

    [[NSUserDefaults standardUserDefaults] registerDefaults:defaultsToRegister];
    [defaultsToRegister release];
}

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