我正在使用 MKMapItem
对象,并且很想探索一些私有成员值。这是读取工作正常的业务对象的尝试:
func exploreGeoItem(item:MKMapItem) {
let geoPlace = item.value(forKey: "place") as! NSObject
let geoBusiness = geo_place.value(forKey: "business") as! NSArray
if geoBusiness.count > 0{
let business = geo_business[0] as AnyObject
print("business is \(String(describing: business))")
}
印刷品:
business is <GEOBusiness: 0x283c90780> {
UID = 3751359433484994387;
URL = "https://www.colorfactory.co";
localizedCategories = (
{
alias = "";
level = 1;
localizedNames = (
{
languageCode = en;
name = "Arts & Entertainment";
}
);
},
但是,如果我尝试访问业务对象中的 UID,则会失败
if geoBusiness.count > 0{
let business = geo_business[0] as AnyObject
print("business is \(String(describing: business.value(forKey: "UID")))")
}
是我访问错误还是有什么特别关于私人成员的问题?