阅读/写作plist

Question

我对阅读/写作plist有一些疑问。 我用这个COSE读的plist

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

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

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

而写的plist我用这个代码：

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中必须保存在文档目录 所以我用这个代码：

//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"); 
    } 
} 

现在我已经加入代码的两片这样的：

//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]; 

这不起作用，但现在我有一些疑虑。在我的plist文件中，我没有看到任何改变，但'txtField'的值可能被保存到'dictMioDB'中？我如何看到一个记录/字符串是否插入到我的plis中？另一个疑问：当我用模拟器写入文档文件夹的时候，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中删除应用程序时，这些数据会被删除吗？对？ 最后一个dubt：当我将读取一个位于文档文件夹中的plist时，我可以使用自动搜索plist路径的第一个代码？

Answer 1

写入文件时，由于无法将文件写入主包，因此出错。它必须写在文件目录：

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

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

所以使用这个功能，将文件写入返回的路径而已，不是在主束