将密钥添加到 NSDictionary (iPhone SDK)

发布于 2024-10-19 14:26:14 字数 341 浏览 3 评论 0原文

非常快速地尝试将密钥添加到 .plist。我差不多明白了，第四行的正确版本是什么？

    NSString *path = [[NSBundle mainBundle] pathForResource:@"Favourites" ofType:@"plist"];
    NSDictionary *rootDict = [[NSDictionary alloc] initWithContentsOfFile:path];
    [rootDict addKey:@"Test"]; //guessed code
    [rootDict writeToFile:path atomically: YES];

原文

A really quickly trying to add a key to a .plist. I almost have it, what is the correct version of the fourth line?

    NSString *path = [[NSBundle mainBundle] pathForResource:@"Favourites" ofType:@"plist"];
    NSDictionary *rootDict = [[NSDictionary alloc] initWithContentsOfFile:path];
    [rootDict addKey:@"Test"]; //guessed code
    [rootDict writeToFile:path atomically: YES];

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病毒体 2024-10-26 14:26:14

您无法向 NSDictionary 添加元素，您需要使用 NSMutableDictionary，然后使用 setObject:forKey: 方法。

[rootDict setObject:someObject forKey:@"someKey"];

请参阅 NSMutableDictionary 类参考

You can't add elements to a NSDictionary, you need to use a NSMutableDictionary then use the setObject:forKey: method.

[rootDict setObject:someObject forKey:@"someKey"];

See NSMutableDictionary class reference

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心在旅行 2024-10-26 14:26:14

差不多了

。

您无法更改 NSDictionary。您无法写入主包。

工作代码：

NSString *path = [[NSBundle mainBundle] pathForResource:@"Favourites" ofType:@"plist"];
NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
[rootDict setObject:@"Test" forKey:@"Key"];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:@"Favourites.plist"];
[rootDict writeToFile:writablePath atomically: YES];
[rootDict release];

almost have it

not really.

You can't change a NSDictionary. You can't write to the mainbundle.

working code:

NSString *path = [[NSBundle mainBundle] pathForResource:@"Favourites" ofType:@"plist"];
NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
[rootDict setObject:@"Test" forKey:@"Key"];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:@"Favourites.plist"];
[rootDict writeToFile:writablePath atomically: YES];
[rootDict release];

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~没有更多了~