ios – 设置初始NSUserDefaults

@H_607_4@ 我已经看到一些指南说这样做,而其他人说这样设置NSUserDefaults的初始值和键会在应用程序更新时引起问题.我希望我能在这里明确回答这个问题.在我的appdelegate didFinishLaunchingWithOptions方法我有：

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if (![defaults IntegerForKey:@"@R_380_10586@lDays"]) {

        // if there is no value for the key,set it to 1
        [defaults setInteger:0 forKey:@"@R_380_10586@lDays"];

    }
    if (![defaults objectForKey:@"currentDate"]) {
        [defaults setObject:@"32 01" forKey:@"currentDate"];
    }
    if (! [defaults boolForKey:@"marked"]) {
        [defaults setBool:NO forKey:@"marked"];

    }
    if (![defaults arrayForKey:@"checkedrows"]) {
        NSMutableArray *arr1  = [NSMutableArray arrayWithArray:[defaults arrayForKey:@"checkedrows"]];
    }
[defaults synchronize];@H_404_12@