[英]NSUserDefaults are not being written to disk
I set some values to NSUserDefaults and if I retrieve them without exiting the app, everything works fine. 我为NSUserDefaults设置了一些值,如果我在不退出应用程序的情况下检索它们,一切正常。 When I restart the app, the changes disappear in 95% of the time.
当我重新启动应用程序时,更改会在95%的时间内消失。 In 5% of the time everything is being saved ok.
在5%的时间里,一切都被保存好了。
I'm facing this problem for the first time. 我第一次面临这个问题。 In my other apps I don't usually save NSString in NSUserDefaults.
在我的其他应用程序中,我通常不会在NSUserDefaults中保存NSString。 May the fact of saving NSString cause problems?
可能保存NSString会导致问题吗?
Here's my code: 这是我的代码:
-(void) mayShowFeedbackMessage
{
NSDateFormatter *dateFormatter = [ [NSDateFormatter alloc] init];
[dateFormatter setTimeStyle: NSDateFormatterLongStyle];
[dateFormatter setDateStyle: NSDateFormatterMediumStyle];
if ([ [NSUserDefaults standardUserDefaults] objectForKey: @"ratingsMessage_shown_on_date"])
{
NSString *lastRatingDateString = [ [NSUserDefaults standardUserDefaults]
objectForKey: @"ratingsMessage_shown_on_date"];
NSDate *lastRatingDate = [dateFormatter dateFromString: lastRatingDateString];
DebugLog(@"lastRatingDateString: %@", lastRatingDateString);
DebugLog(@"time since last message: %.0f", [ [NSDate date] timeIntervalSinceDate: lastRatingDate]);
if ( [ [NSDate date] timeIntervalSinceDate: lastRatingDate] >= 120.0f )
{
[self showFeedbackMessage];
NSDateFormatter *dateFormatter = [ [NSDateFormatter alloc] init];
[dateFormatter setTimeStyle: NSDateFormatterLongStyle];
[dateFormatter setDateStyle: NSDateFormatterMediumStyle];
NSString *dateString = [dateFormatter stringFromDate: [NSDate date] ];
[dateFormatter release];
[ [NSUserDefaults standardUserDefaults] setObject: dateString
forKey: @"ratingsMessage_shown_on_date" ];
lastRatingDateString = [ [NSUserDefaults standardUserDefaults]
objectForKey: @"ratingsMessage_shown_on_date"];
DebugLog(@"new date: %@", lastRatingDateString);
}
}
else
{
NSDateFormatter *dateFormatter = [ [NSDateFormatter alloc] init];
[dateFormatter setTimeStyle: NSDateFormatterLongStyle];
[dateFormatter setDateStyle: NSDateFormatterMediumStyle];
NSString *dateString = [dateFormatter stringFromDate: [NSDate date] ];
[dateFormatter release];
[ [NSUserDefaults standardUserDefaults] setObject: dateString
forKey: @"ratingsMessage_shown_on_date" ];
NSString *lastRatingDateString = [ [NSUserDefaults standardUserDefaults]
objectForKey: @"ratingsMessage_shown_on_date"];
DebugLog(@"new date: %@", lastRatingDateString);
}
[dateFormatter release];
}
Thanks. 谢谢。
在执行必要的更改后添加以下代码解决了以下问题:
[ [NSUserDefaults standardUserDefaults] synchronize];
For what it's worth you can look at your defaults with the Property Editor to see if it's being written correctly: 对于它的价值,您可以使用属性编辑器查看默认值,以查看它是否正确写入:
open ~/Library/Preferences/org.your.app.plist
or just dump them: 或者只是转储它们:
defaults read org.your.app
NSuserDefualts was not saving my values on game crash. NSuserDefualts没有在游戏崩溃时保存我的值。 by using,
通过使用,
[ [NSUserDefaults standardUserDefaults] synchronize];
the vales are getting saved. vales正在保存。
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