1.设置tileInfo
AGSSpatialReference *spatialReference = [AGSSpatialReference spatialReferenceWithWKID:4326]; //WKID根据具体情况调整
//origin
AGSPoint *origin = AGSPointMake(-180, 90, spatialReference);
//levelsOfDetail数组
NSArray *loadsArr = @[[AGSLevelOfDetail levelOfDetailWithLevel:2 resolution:0.3515625 scale:147748796.52937502],
[AGSLevelOfDetail levelOfDetailWithLevel:3 resolution:0.17578125 scale:73874398.264687508],
[AGSLevelOfDetail levelOfDetailWithLevel:4 resolution:0.087890625 scale: