objective-c - 读写plist文件的奇怪问题

Question

我有一个从 plist 文件中读取信息的应用程序。为此，我使用下面的代码:

  NSData *plistData;  
    NSString *error;  
    NSPropertyListFormat format;  
    id plist;  
    localizedPath = [[NSBundle mainBundle] pathForResource:@"settings" ofType:@"plist"];  
    plistData = [NSData dataWithContentsOfFile:localizedPath];   
    
    plist = [NSPropertyListSerialization propertyListFromData:plistData mutabilityOption:NSPropertyListImmutable format:&format errorDescription:&error];  
    if (!plist) {  
        NSLog(@"Error reading plist from file '%s', error = '%s'", [localizedPath UTF8String], [error UTF8String]);  
        [error release];  
    }  
    
    
    
   
    NSString *tel=[NSString stringWithFormat:@"tel:%@",[plist objectForKey:@"number"]];
    NSURL *telephoneURL = [NSURL URLWithString:tel];
    [[UIApplication sharedApplication] openURL:telephoneURL];

为了编写它，我使用以下代码:

- (IBAction) saveSetting:(id)sender{
    
    NSData *plistData;  
    NSString *error;  
    NSPropertyListFormat format;  
    id plist;  
    
    NSString *localizedPath = [[NSBundle mainBundle] pathForResource:@"settings" ofType:@"plist"];  
    plistData = [NSData dataWithContentsOfFile:localizedPath];   
    
    plist = [NSPropertyListSerialization propertyListFromData:plistData mutabilityOption:NSPropertyListMutableContainers format:&format errorDescription:&error];  
    if (!plist) {  
        NSLog(@"Error reading plist from file '%s', error = '%s'", [localizedPath UTF8String], [error UTF8String]);  
        [error release];  
    }  
    
    NSLog([plist objectForKey:@"message"]);
    [plist setValue:textMex.text forKey:@"message"];
    NSLog([plist objectForKey:@"message"]);
    
    NSLog([plist objectForKey:@"number"]);
    [plist setValue:textNumero.text forKey:@"number"];
    NSLog([plist objectForKey:@"number"]);
    
    [plist setValue:@"NO" forKey:@"firstTime"];
    
    [plist writeToFile:localizedPath atomically:YES];
    
    [self aggiorna];
    
    [settingScreen removeFromSuperview];
    
}

现在我遇到了一个大问题，该应用程序在我的所有开发设备和模拟器中都能正常工作，并且该应用程序可以正确读取和写入文件。

我在 Apple 商店提交了应用程序，但其他用户无法读取/写入此文件。

这是为什么？

Answer 1

您无法写回应用程序包。您必须将原始 plist 文件复制到文档目录或任何其他可写位置，然后才能写入。

示例

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString libraryPath = [paths objectAtIndex:0];
NSString plistPath = [libraryPath stringByAppendingPathComponent:@"settings.plist"];

// Checks if the file exists at the writable location.
if ( ![[NSFileManager defaultManager] fileExistsAtPath:plistPath] ) {
    NSString *masterFilePath = [[NSBundle mainBundle] pathForResource:@"settings" ofType:@"plist"];

    // Try to copy the master file to the writable location
    NSError *error;
    if ( ![[NSFileManager defaultManager] copyItemAtPath:masterFilePath toPath:plistPath error:&error] ) {
        NSLog(@"Error: %@", [error localizedDescription]); 
        // Serious error.
    }
}

...
// Ready for use.
NSData *plistData = [NSData dataWithContentsOfFile:plistPath];