Question

通常情况下，我将数据保存到plist（只是我不太关心的数据，如果JailBroken手机被黑客攻击，比如用户偏好和内容），除非用户首次启动应用程序时我创建了这样的plist：

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

NSString *pathFirstTime = [documentsDirectory stringByAppendingPathComponent:@"FirstTime.plist"];

NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath: pathFirstTime])
{
    NSString *bundleFirstTime = [[NSBundle mainBundle] pathForResource:@"FirstTime" ofType:@"plist"];

    [fileManager copyItemAtPath:bundleFirstTime toPath:pathFirstTime error:&error];
}

所以我在xcode中创建一个空白plist文件并将其放入包中，第一次用户启动应用程序时将其复制到documentsDirectory ...

无论如何，我可以在objective-c中第一次创建空白plist文件，这样我实际上不必在Xcode中创建一个并将其放入包中，但它会在第一次自动创建用户启动应用程序......

基本上只是避免使用此代码：[fileManager copyItemAtPath:bundleFirstTime toPath:pathFirstTime error:&error];

Answer 1

[@{} writeToFile: pathFirstTime atomically: NO];

Answer 2

创建NSArray或NSDictionary个实例并使用writeToFile:atomically:。

Answer 3

删除整个代码，这样做就可以了。

    if(![[NSUserDefaults standardUserDefaults] objectForKey:@"FirstRun"]){
            NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            NSString *pathFirstTime = [documentsDirectory stringByAppendingPathComponent:@"MyPlistFile.plist"];

            [@{} writeToFile: pathFirstTime atomically: YES];

            [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:NO] forKey:@"FirstRun"];
        }

想要添加新记录吗？

        NSString *pathFirstTime = [documentsDirectory stringByAppendingPathComponent:@"MyPlistFile.plist"];
        NSMutableDictionary *mdic = [[NSMutableDictionary alloc] initWithDictionary:[NSDictionary dictionaryWithContentsOfFile:pathFirstTime]];

        [mdic setObject:[NSNumber numberWithInt:3] forKey:@"user-selected-color-scheme"];
        [mdic writeToFile: pathFirstTime atomically: YES];

稍后阅读plist文件？

        NSString *pathFirstTime = [documentsDirectory stringByAppendingPathComponent:@"MyPlistFile.plist"];
        NSMutableDictionary *mdic = [[NSMutableDictionary alloc] initWithDictionary:[NSDictionary dictionaryWithContentsOfFile:pathFirstTime]];
        NSLog(@"%@", mdic);

以编程方式创建空白plist（在DocumentsDirectory中）

3 个答案: