如何在設置動態值後將數據保存到plist中？

<plist version="1.0"> 
    <dict> 
      <key>InfoValue</key> 
      <string>false</string> 
      <key>AudioValue</key> 
      <string>true</string> 
      <key>VideoValue</key> 
      <string>true</string> 
      <key>DescValue</key> 
      <string>true</string> 
      <key>LinkValue</key> 
      <string>true</string> 
    </dict> 
</plist>

這是plist文件，我想更改InfoValue的dyanamically。在我的代碼我米使用像如何在設置動態值後將數據保存到plist中？

settingsPath=[[NSBundle mainBundle] pathForResource:@"SettingsValue" ofType:@"plist"]; 
settingsItem = [[NSMutableDictionary alloc] initWithContentsOfFile:settingsPath]; 

[settingsItem setObject:@"false" forKey:@"InfoValue"];

並在此之後

[settingsItem writeToFile:settingsPath atomically:YES];

，但它不是將數據保存到plist文件。而不是我得到以下錯誤：

-[NSConcreteValue getFileSystemRepresentation:maxLength:]: unrecognized selector sent to instance 0x8fad490 
2013-02-27 10:26:44.479 vCamView[1577:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '-[NSConcreteValue getFileSystemRepresentation:maxLength:]: unrecognized selector sent to instance 0x8fad490' 
*** First throw call stack: 
(0x33dc012 0x2944e7e 0x34674bd 0x33cbbbc 0x33cb94e 0x2354915 0x23548b9 0x2354872 
    0x235468f 0x1e207 0x2958705 0x188f920 0x188f8b8 0x1950671 0x1950bcf 0x1a90747 
    0x2342e83 0x339b376 0x339ae06 0x3382a82 0x3381f44 0x3381e1b 0x376f7e3 0x376f668 
    0x188c65c 0x27e2 0x2715)

來源

2013-02-27 iOSGhost

檢查此鏈接http://stackoverflow.com/questions/4075056/what-are-the-options-for-saving-data-in-ios – 2013-02-27 05:22:01

的應用程序的包是隻讀的。你不能將plist數據寫回到包中。 – rmaddy 2013-02-27 05:23:54

您不能修改束中的文件。它是隻讀的。試圖保存的plist在DocumentDirectory

NSString *directoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]; 
    NSString *filePath = [directoryPath stringByAppendingPathComponent:@"SettingsValue.plist"]; 

    // Read from document directory 
    settingsItem = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath]; 

    // update the dictionary 
    [settingsItem setObject:@"false" forKey:@"InfoValue"]; 

    // write back to file 
    [settingsItem writeToFile:filePath atomically:YES];

來源

2013-02-27 05:38:52

如何在設置動態值後將數據保存到plist中？

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