Question

我试过阅读很多问题/教程，但我找不到答案！我正在尝试从textField获取一个字符串并将其保存在我创建的datas.plist文件中（在默认键Root下）我试过这段代码：

//Save Name to plist
        if([name.text length] > 0){
            NSString *string = name.text;
            [array addObject:string];
            //plist path
            NSString *path = [[NSBundle mainBundle] pathForResource:@"datas" ofType:@"plist"];
            //save object
            [array writeToFile: path atomically:YES];

        }

其中array是

@interface DetailViewController (){
    NSMutableArray* array;
}

但是当我尝试保存时，应用程序崩溃（之前我写过的动作连接到按钮）会出现此错误：

* 由于未捕获的异常'NSInvalidArgumentException'而终止应用，原因：'无法创建 NSPersistentStoreCoordinator与nil模型'

我认为写入的代码不正确，因为我从不输入密钥保存位置（如@“Root”）或类似的东西。提前致谢

修改

我试过这段代码，但没有写任何东西：

- (void)addToMyPlist {
    NSString *destPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    destPath = [destPath stringByAppendingPathComponent:@"dati"];

    // If the file doesn't exist in the Documents Folder, copy it.
    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath:destPath]) {
        NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"dati" ofType:@"plist"];
        [fileManager copyItemAtPath:sourcePath toPath:destPath error:nil];
    }

    // Load the Property List.
    array = [[NSMutableArray alloc] initWithContentsOfFile:destPath];

        //NSString *path = [[NSBundle mainBundle] pathForResource:@"dati" ofType:@"plist"];
        NSString *string = self.name.text;

        NSArray *values = [[NSArray alloc] initWithObjects:string, nil];
        NSArray *keys = [[NSArray alloc] initWithObjects:@"Root", nil];
        NSDictionary *dict = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
        [array addObject:dict];
        [array writeToFile:destPath atomically:YES];
}

出了什么问题？

Answer 1

捆绑包中的所有文件都是只读的。

您必须将您的pList移动到您的应用程序的私人文档（或另一个，其中有3个可用）文件夹中才能拥有写入权限。

例如，将您的包文件复制到Documents目录：

if([name.text length] > 0){
        NSString *string = name.text;
        [array addObject:string];

        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSError *error;
        //Path to document directory
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];

        //Path to your datas.plist inside documents directory
        NSString *documentsPath = [documentsDirectory stringByAppendingPathComponent:@"datas.plist"];

        //If the file doesn't exists yet
        if ([fileManager fileExistsAtPath:documentsPath] == NO) {
            //Let's copy it in your Documents folder
            NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"datas" ofType:@"plist"];

            [fileManager copyItemAtPath:bundlePath toPath:documentsPath error:&error];
        }

        [array writeToFile: documentsPath atomically:YES];

    }

将NSString添加到.plist（属性列表）文件

1 个答案: