Question

这是我的方案：我需要保存50行文本，并在应用程序启动后访问每行文本。也就是说，对于控制参数的改变，iPhone上显示的文本应该改变（即指向第二行文本，然后指向第三行......）。我希望将这些数据存储在属性列表中，然后相应地访问数据（不需要更改所需的数据模型），而不是去SQLite。

最初，我想过创建一个NSDictionary实例并存储字符串对象（文本行）。但是，困境是：如何为上述案例创建属性列表，然后在运行时访问数据。

示例代码将非常感激。我一直试图让我的头脑周围的财产清单，但我仍然无法弄明白。感谢。

Answer 1

如果我理解得很清楚，那么您正试图在应用程序的文档目录中保存plist文件。这是您阅读应用程序包中嵌入的plist文件的方法，然后将其保存在文档目录中：

- (void)applicationDidFinishLaunching:(UIApplication *)application 
{
    // If your plist file is in the app bundle, and is called "file.plist":
    NSString *path = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"plist"];
    NSArray *array = [[NSArray alloc] initWithContentsOfFile:path];

    // Do something with your array...

    // If your plist has to be created or saved at runtime, you can't store it in the
    // main bundle, but you can do it in the app's document directory:
    NSString *documents = [self documentsDirectory];
    path = [documents stringByAppendingPathComponent:@"another_file.plist"];
    [array writeToFile:path atomically:YES];
    [array release];

    // ~/Library/Application Support/iPhone Simulator/User/Applications/[YOUR_APP_ID_HERE]/Documents/another_file.plist
    NSLog(@"%@", path);

    // You can read the file later again doing initWithContentsOfFile: again
    // with the new file path.

    [window makeKeyAndVisible];
}

- (NSString *)documentsDirectory
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    return [paths objectAtIndex:0];
}

file.plist文件可能是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <string>test</string>
    <string>wetwert</string>
    <string>dfdfh</string>
    <integer>345634</integer>
</array>
</plist>

如何在iPhone的属性列表中存储文本行？

1 个答案: