如何在设备上编写plist？目标C iPhone

Question

我有这样的代码：

#define ALERT(X)    {UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Info" message:X delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];[alert show];[alert release];}

- (id)readPlist:(NSString *)fileName {  
    NSData *plistData;  
    NSString *error;  
    NSPropertyListFormat format;  
    id plist;  

    NSString *localizedPath = [[NSBundle mainBundle] pathForResource:fileName 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];  
    }  

    return plist;  
}  

- (void)writeToPlist: (NSString*)a
{
    NSString *path = [[NSBundle mainBundle] bundlePath];
    NSString *finalPath = [path stringByAppendingPathComponent:@"data.plist"];
    NSMutableArray* pArray = [[NSMutableArray alloc] initWithContentsOfFile:finalPath];

    [pArray addObject:a];
    [pArray writeToFile:finalPath atomically: YES];
    ALERT(@"finished");
    /* This would change the firmware version in the plist to 1.1.1 by initing the NSDictionary with the plist, then changing the value of the string in the key "ProductVersion" to what you specified */
} 

- (void)viewDidLoad {
    [super viewDidLoad];
    [self writeToPlist:@"this is a test"];
    NSArray* the = (NSArray*)[self readPlist:@"data"];
    NSString* s = [NSString stringWithFormat:@"%@",the];
    ALERT(s);
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

在模拟器上，第二个警报正确显示文件的内容，但在设备上它什么也没显示？我做错了什么？请显示代码/片段......

Answer 1

问题是您无法将文件写入 mainBundle 文件夹，您的设备上只能访问 Documents 文件夹。

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];