iOS - Levels of Baidu Maps

Baidu Map itself has 17 levels, as follows:

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1. {"20m","50m","100m","200m","500m","1km","2km","5km","10km","20km","25km","50km","100km","200km","500km","1000km","2000km"}  

However, the provided development kit only supports 16 levels, Level: 3~18, and the scale is as follows:

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1. {"50m_18","100m_17","200m_16","500m_15","1km_14","2km_13","5km_12","10km_11","20km_10","25km_9","50km_8","100km_7","200km_6","500km_5","1000km_4","2000km_3"}