writeToFile在sim中工作，但不在设备上工作 [英] writeToFile working in sim but not on device

问题描述

此代码在模拟器上有效，但在设备上无效。我肯定这与写入文件有关：

This code works on simulator but not on device. I am positive this has something to do with writing to file:

NSString *path = [[NSBundle mainBundle] pathForResource:@"SongData" ofType:@"plist"];
        NSArray *tempData = [[NSArray alloc] initWithContentsOfFile: path];

        NSMutableArray *arr = [[NSMutableArray alloc] init];
        for (NSDictionary *dict in tempData) {
            NSMutableDictionary *new = [[dict mutableCopy] autorelease];
            if ([[new objectForKey:@"Song Title"] isEqualToString:[[tableData objectAtIndex:[indexPath row]] objectForKey:@"Song Title"]]) {
                BOOL fav = [[new objectForKey:@"Favorite"] boolValue];
                [new setObject:[NSNumber numberWithBool:!fav] forKey:@"Favorite"];
            }
            [arr addObject:new];
        }
        [arr writeToFile:path atomically:YES];

我基本上是写NSMutableArray的文件，我不确定原子上是什么意思，但是我已经尝试过是和否，两者都不起作用。

I am basically writing to file the NSMutableArray, I am not sure what atomically means, but I have tried both yes and no, both don't work.

谢谢。

推荐答案

您无法写入应用包，由于沙箱的限制（这也会破坏您的代码签名）。您应该改为写入应用程序的documents目录。

You cannot write into your app bundle, because of sandbox restrictions (it would also break your code signature). You should write to your app's documents directory instead.

您可以使用以下命令获取Documents目录：

You can get your Documents directory with:

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

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