iOS游戏中心:在沙箱的排行榜上没有显示的分数

I'm developing a Game Center enabled game and I'm running into an issue in the sandbox environment. I can successfully report the score without error. However, when I show the leaderboard, there are no scores visible. To verify that the score actually got there, I query the local user's score with the following code:I'm developing a Game Center enabled game and I