从未知字典键名读取iOS Plist值?
问题描述:
我有以下PLIST,需要访问嵌套在字典中的助手标识符。问题是帐户下的第一个密钥(以4FD9E669开头)对每个设备都是唯一的。如何在不知道字典密钥的情况下返回助手标识符?从未知字典键名读取iOS Plist值?
这里是我的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>
我都试过,如果A.Identifier是已知的,其工作原理如下...(这不利于)
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];
请帮帮忙!谢谢!
答
乍一看,你可以循环所有的钥匙,直到你找到你想要的。
for (NSString *key in [nestedPrefs allKeys]) {
// Pick which key is the one you want
}
我不认为你需要那样做。这是逻辑,只是跳过找到正确的钥匙的步骤。
for (NSMutableDictionary *aPrefs in [nestedPrefs allValues]) {
NSString* assistantPref = [aPrefs valueForKey:@"Assistant Identifier"];
if (assistantPref) {
// Whatever you need.
}
}
希望有所帮助。