这段代码给你参考：// scoreDictionary property of NSMutableDictionary class must be declared in selfNSNumber *previousScore = [self.scoreDictionary objectForKey:[NSNumber numberWithInt:[self quizNum]]];if (previousScore != nil) { [self clearQuizBtns]; NSInteger previousScoreValue = [previousScore integerValue]; [self selectButtonAtTag:previousScoreValue];}else { [self clearQuizBtns];}
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