问题描述:根据地图的层级(mapView.zoomLevel),在数组内寻找到最接近这个层级的数值123456789101112131415161718- (NSInteger)getMinValueShowLevel:(NSArray *)showLevels mapZoomLevel:(CGFloat)mapZoomLevel{ NSInteger suitValue = (int)mapZoomLevel; NSInteger diffLevel = 9999; for (NSNumber *showLevel in showLevels) { NSInteger diffLevelTmp = fabs(mapZoomLevel - [showLevel intValue]); if (diffLevelTmp < diffLevel) { diffLevel = diffLevelTmp; suitValue = [showLevel intValue]; } } return suitValue;}注:代码中showLevels:存有数值对象,如: showLevels = @[@(12), @(7), @(9)];suitValue:找到的最合适的值diffLevel:层级差mapZoomLevel:参照层级,根据这个层级,找到数组中最接近这个数的值