stored to '*' during its initialization is never read

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NSMutableArray *datesArray = [[NSMutableArray alloc]init];
 datesArray = [_onDemandDictionary objectForKey:key];
出现了

stored to 'datesArray' during its initialization is never read

改成

NSMutableArray *datesArray = nil;
 datesArray = [_onDemandDictionary objectForKey:key];

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