如何在plist中写入数据？

Question

我在资源文件夹中创建了save.plist.我直接在其中写了一些数据(不使用编码).我能够读取该数据,但我无法通过代码写入同一个save.plist.通过使用以下代码,我试图写入数据,但它存储在我的.app plist中.代码在这里

NSString *errorDesc = nil;

NSPropertyListFormat format;

NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"save" ofType:@"plist"];

NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];

NSMutableDictionary *temp = (NSMutableDictionary *)[NSPropertyListSerialization
                     propertyListFromData:plistXML
                              mutabilityOption:NSPropertyListMutableContainersAndLeaves
                  format:&format errorDescription:&errorDesc];

if (!temp) {

    NSLog(errorDesc);

    [errorDesc release];        
    }
    //  [temp setValue:@"123" forKey:@"line1"];
    //  [temp writeToFile:plistPath atomically: YES];

    //Reading data from save.plist
    NSLog([temp objectForKey:@"name"]);
    NSLog([temp objectForKey:@"wish"]);
    NSNumber *num=[temp valueForKey:@"roll"];
    int i=[num intValue];
    printf("%d",i);
        //writitng the data in save.plist

    [temp setValue:@"green" forKey:@"color"];
    [temp writeToFile:plistPath atomically: NO];
    NSMutableDictionary *temp1 = (NSMutableDictionary *)[NSPropertyListSerialization
                propertyListFromData:plistXML                                                            
                                mutabilityOption:NSPropertyListMutableContainersAndLeaves
                format:&format errorDescription:&errorDesc];

    NSLog([temp objectForKey:@"color"]);

我想要的是,我想写的数据应该只写入存储在引用中的save.plist.我是这个概念的新手.所以,如果有人知道,请帮助我.提前致谢.:-)

Answer 1

我不知道我是否理解你的问题,但如果你想在.app包中写入.plist,你可能做错了.如果要存储首选项,则应考虑使用NSUserDefaults.
如果你真的想修改捆绑的.plist - 这里有一些代码:

NSString *plistPath = nil;
NSFileManager *manager = [NSFileManager defaultManager];
if (plistPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"Contents/Info.plist"]) 
{
    if ([manager isWritableFileAtPath:plistPath]) 
    {
        NSMutableDictionary *infoDict = [NSMutableDictionary dictionaryWithContentsOfFile:plistPath];
        [infoDict setObject:[NSNumber numberWithBool:hidden] forKey:@"LSUIElement"];
        [infoDict writeToFile:plistPath atomically:NO];
        [manager changeFileAttributes:[NSDictionary dictionaryWithObject:[NSDate date] forKey:NSFileModificationDate] atPath: [[NSBundle mainBundle] bundlePath]];
    }
}

更新:
Nate Flink指出上面使用的一些NSFileManager方法已被弃用.他发布了以下替换方法的答案:https: //stackoverflow.com/a/12428472/100848

Answer 2

weichsel最新版本的原始实例(谢谢!).Xcode抛出了一些警告,其中一个是NSFileManager上不推荐使用的方法.此处更新了iOS 5.1中不推荐使用的方法

    NSString *plistPath = nil;
NSFileManager *manager = [NSFileManager defaultManager];
if ((plistPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"mySpecial/PathTo.plist"])) 
{
    if ([manager isWritableFileAtPath:plistPath]) 
    {
        NSMutableDictionary *infoDict = [NSMutableDictionary dictionaryWithContentsOfFile:plistPath];
        [infoDict setObject:@"foo object" forKey:@"fookey"];
        [infoDict writeToFile:plistPath atomically:NO];
        [manager setAttributes:[NSDictionary dictionaryWithObject:[NSDate date] forKey:NSFileModificationDate] ofItemAtPath:[[NSBundle mainBundle] bundlePath] error:nil];
    }
}