Arcgis OC 修改图层某一段颜色

Arcgis For Ios OC 版 在已有的图层上,修改图层的某一段颜色

// 主要方法 修改Layer的render
AGSServiceFeatureTable *trailheadsTable = [[AGSServiceFeatureTable alloc] initWithURL:url];AGSFeatureLayer *trailheadsFeatureLayer = [[AGSFeatureLayer alloc] initWithFeatureTable:trailheadsTable];AGSSimpleLineSymbol *simbol = [[AGSSimpleLineSymbol alloc] initWithStyle:AGSSimpleLineSymbolStyleSolid color:[UIColor redColor] width:2];
//这个就是你url里面field里面字段 key = value 找到对应字段对应的值 找到对应图层 
//修改图层颜色 你要修改多个颜色 要创建多个layer 一个一个修改
trailheadsFeatureLayer.definitionExpression = @"line = '东线'";trailheadsFeatureLayer.renderer = [[AGSSimpleRenderer alloc] initWithSymbol:simbol];[self.map.operationalLayers addObject:trailheadsFeatureLayer];