修改数组里某个字典的key对应的值

@property(nonatomic,strong)NSMutableArray *dataArray;//数据
self.dataArray = [NSMutableArray arrayWithObjects:
@{@"customName":@"姓名",@"isCheck":@"1"}.mutableCopy,
@{@"customName":@"手机",@"isCheck":@"1"}.mutableCopy, nil];

修改数组里某个字典的key对应的值:
self.dataArray[1][@"isCheck"] = @"0";(要保证数组可变,数组里的字典可变)

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