objective-c - 使用 .plist 中的键在数组中创建 (Cocoa/iPhone SDK)

Question

嘿伙计们，尝试以编程方式将(对象？)添加到我的 plist，这是我到目前为止所做的:

 NSString *documentsDirectory = [[NSString alloc] initWithString:[[[[NSBundle mainBundle]  resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents/myfolder"]];
        NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:@"Favourites.plist"];

        NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:writablePath];


        [rootDict setValue:@"My Third PDF" forKey:@"Title"];
        [rootDict writeToFile:writablePath atomically: YES];

这是我的plist:

<plist version="1.0">
<dict>
    <key>Rows</key>
    <array>
        <dict>
            <key>SaveName</key>
            <string>first.pdf</string>
            <key>Title</key>
            <string>My first PDF</string>
        </dict>
        <dict>
            <key>SaveName</key>
            <string>second.pdf</string>
            <key>Title</key>
            <string>My Second PDF</string>
        </dict>
    </array>
</dict>
</plist>

我如何添加另一个(对象？)，例如

<dict>
            <key>SaveName</key>
            <string>third.pdf</string>
            <key>Title</key>
            <string>My third PDF</string>
        </dict>

到我的plist？谢谢!

Answer 1

您首先必须确保 Rows 数组是可变的:

[rootDict setObject:[[rootDict objectForKey:@"Rows"] mutableCopy] forKey:@"Rows"];

您需要创建一个具有该结构的字典，例如

NSDictionary *third = [NDSictionary dictionaryWithObjectsAndKeys:
                       @"third.pdf", @"SaveName",
                       @"My third PDF", @"Title",
                       nil];

并将其添加到数组中:

[[rootDict objectforKey:@"Rows"] addObject:third];