Question

我对读/写plist有一些疑问。我用这个cose读取plist

NSString *strFilePath = [ [NSBundle mainBundle] pathForResource:@"miodb" ofType:@"plist" ] ;

NSMutableDictionary *dictMioDB = [[NSMutableDictionary alloc] initWithContentsOfFile:strFilePath] ;

NSString *strValue ;
strValue = [dictMioDB objectForKey: @"stringa1" ] ;
NSLog( @"%@" , strValue ) ;

对于写plist我使用此代码：

NSString *strFilePath = [ [NSBundle mainBundle] pathForResource:@"miodb" ofType:@"plist" ] ;
NSLog( @"%@" , strFilePath ) ;

NSMutableDictionary *dictMioDB = [[NSMutableDictionary alloc] initWithContentsOfFile:strFilePath] ;

NSString *strTextField = [NSString stringWithFormat: @"%@" , [txtField text] ] ;

// ga - salvataggio del valore nella chiave nel NSMutableDictionary
[dictMioDB setValue: strTextField forKey:@"stringa1"];
[dictMioDB writeToFile: strFilePath atomically:YES];

现在的问题是plist必须保存在Documents目录中所以我使用了这段代码：

//percorso file su cartella documents
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *path = [documentsDir stringByAppendingPathComponent:@"iOre.sqlite"];
    //[[NSFileManager defaultManager] removeItemAtPath:path error:nil];

//controllo se il file esiste
if(![[NSFileManager defaultManager] fileExistsAtPath:path])
{
    //se non esiste lo copio nella cartella cosuments
    NSString *pathLocale=[[NSBundle mainBundle] pathForResource:@"iOre" ofType:@"sqlite"];
    if ([[NSFileManager defaultManager] copyItemAtPath:pathLocale toPath:path error:nil] == YES) 
    {
        NSLog(@"copia eseguita");
    }
}

现在我加入了两段代码：

  //percorso file su cartella documents
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *path = [documentsDir stringByAppendingPathComponent:@"LevelsD.plist"];
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];

NSString *pathLocale;

//controllo se il file esiste
if(![[NSFileManager defaultManager] fileExistsAtPath:path])
{
    //se non esiste lo copio nella cartella documents
    pathLocale=[[NSBundle mainBundle] pathForResource:@"LevelsD" ofType:@"plist"];
    if ([[NSFileManager defaultManager] copyItemAtPath:pathLocale toPath:path error:nil] == YES)
    {
        NSLog(@"copia eseguita");
    }
}

// ga - trovo la posizione del .plist
//NSString *strFilePath = [ [NSBundle mainBundle] pathForResource:@"LevelsD" ofType:@"plist" ] ;
NSLog( @"%@" ,documentsDir) ;

// ga - copio tutto il .plist (la root è un Dictionary) in un NSMutableDictionary
NSMutableDictionary *dictMioDB = [[NSMutableDictionary alloc] initWithContentsOfFile:documentsDir] ;

NSString * txtField = @"1";

//NSString *strTextField = [NSString stringWithFormat: @"%@" , txtField ] ;

// ga - salvataggio del valore nella chiave nel NSMutableDictionary
[dictMioDB setValue: txtField forKey:@"LevelHere1"];
[dictMioDB writeToFile: pathLocale atomically:YES];

这不行，但现在我有些疑惑。在我的plist文件中，我没有看到任何变化，但'txtField'的值可能保存到'dictMioDB'中？如何在我的plis中插入记录/字符串？另一个疑问：当我使用模拟器在Document文件夹中写入内容时，当我关闭它或者我将重新编译应用程序时，数据将被删除？在Iphone中，当我删除应用程序时，这些数据会被删除吗？对？最后一个dubt：当我读到文件夹中的一个plist时，我可以使用第一个自动搜索plist路径的代码吗？

Answer 1

在编写文件时，由于无法将文件写入主包，因此操作错误。它必须写在文档目录中：

+ (NSString *) getFilePathInDocsDir: (NSString *)fileName
{
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                                 NSUserDomainMask, YES);

    NSString *docsDir = documentPaths[0];
    NSString *filePathInDocsDir = [docsDir stringByAppendingPathComponent:fileName];
    return filePathInDocsDir;
}

因此，请使用此函数并将文件写入返回的路径，而不是在主程序包

中

读/写plist

1 个答案: