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我有以下 PLIST，需要访问嵌套在字典中的 Assistant Identifier。问题是 Accounts 下的第一个键（以 4FD9E669... 开头）对于每个设备都是唯一的。如何在不知道字典键的情况下返回助手标识符？

这是我的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>Accounts</key>
    <dict>
        <key>4FD9E669-A5EA-4526-A6D2-0440858221A6</key>
        <dict>
            <key>Assistant Identifier</key>
            <string>05483ADC-23E1-400E-83E8-F7365063F56F</string>
            <key>Last Assistant Data Anchor</key>
            <string>c1e3ad3c51d7fb962b29ca2deb4990c0f6ae8962</string>
            <key>Speech Identifier</key>
            <string>dcaf7c87-c023-456c-a200-7db8bd5e10f1</string>
            <key>Validation Expiration</key>
               <date>2012-07-17T22:37:37Z</date>
        </dict>
    </dict>
    <key>Session Language</key>
    <string>en-US</string>
</dict>
</plist>

如果 A.Identifier 已知，我已经尝试了以下方法......（这没有帮助）

NSString* filename = @"/var/mobile/Library/Preferences/com.apple.assistant.plist";
NSMutableDictionary* prefs = [[NSMutableDictionary alloc] initWithContentsOfFile:filename];

NSMutableDictionary* nestedPrefs = (NSMutableDictionary*)[prefs valueForKey:@"Accounts"];

NSMutableDictionary* aPrefs = (NSMutableDictionary*)[nestedPrefs valueForKey:@"4FD9E669-A5EA-4526-A6D2-0440858221A6"];

NSString* assistantPref = (NSString*)[aPrefs valueForKey:@"Assistant Identifier"];

UIAlertView *theAlert = [[UIAlertView alloc] initWithTitle:@"Assistant Identifier" message:assistantPref  delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[theAlert show];
[theAlert release];

请帮忙！谢谢你！

4

1 回答 1

1

乍一看，您可以遍历所有键，直到找到您想要的键。

for (NSString *key in [nestedPrefs allKeys]) {
    // Pick which key is the one you want
}

我不认为你需要这样做。这是跳过找到正确密钥的步骤的逻辑。

for (NSMutableDictionary *aPrefs in [nestedPrefs allValues]) {
    NSString* assistantPref = [aPrefs valueForKey:@"Assistant Identifier"];
    if (assistantPref) {
       // Whatever you need.
    }
}

希望有帮助。

于 2012-07-18T00:05:46.880 回答