NSMutableArray *arr = [[NSMutableArray alloc]init];
arr = [dic objectForKey:key];
出现stored to 'datesArray' during its initialization is never read
改成
NSMutableArray *arr = nil;
arr = [dic objectForKey:key];
即可
NSMutableArray *arr = [[NSMutableArray alloc]init];
arr = [dic objectForKey:key];
出现stored to 'datesArray' during its initialization is never read
改成
NSMutableArray *arr = nil;
arr = [dic objectForKey:key];
即可