ios – 设置初始NSUserDefaults

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@R_419_2545@明确回答这个问题.在我的appdelegate didFinishLaunchingWithOptions方法我有：

@H_944_7@NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if (![defaults IntegerForKey:@"@R_191_10586@lDays"]) { // if there is no value for the key,set it to 1 [defaults setInteger:0 forKey:@"@R_191_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];