如何在运行时Ios中实现委托方法

Question

本地脚本版本5.1.1

Xcode 10及更高版本，Mojave OS

iOS运行时问题。 任何人都知道如何在nativescript angular

中实现委托方法

export class searchDelegateImpl extends NSObject implements UISearchBarDelegate{
    public static ObjCProtocols = [UISearchBarDelegate];

    // static new(): searchDelegateImpl {
    //     return <searchDelegateImpl>super.new() 
    // }

    searchBarTextDidBeginEditing( searchBar: UISearchBar){ 
        console.log("TestIOSFoCusedBegin");
    }
    searchBarTextDidEndEditing( searchBar: UISearchBar){ 
        console.log("TestIOSFoCusedEnd");
    }
    searchBarCancelButtonClicked( searchBar: UISearchBar){ 
        console.log("TestIOSFoCusedCancel");
    }
    searchBarSearchButtonClicked( searchBar: UISearchBar){ 
        console.log("TestIOSFoCusedOk");
    }

}

interface UISearchBarDelegate extends NSObjectProtocol {
    searchBarShouldEndEditing?(searchBar: UISearchBar);
    searchBarTextDidEndEditing?(searchBar: UISearchBar);
    searchBarCancelButtonClicked?(searchBar: UISearchBar);
    searchBarSearchButtonClicked?(searchBar: UISearchBar);
}

对应HTML的搜索栏加载功能定义

export class RestaurantHomeComponent implements OnInit{
//ngOnit and some other functions
searchBarloaded(args)
    {
        this.searchbar=<SearchBar>args.object
        if(isIOS){
            this.searchbar.ios.delegate = 
 searchDelegateImpl.new();
            console.log("After IOS"+this.searchbar.focus());
        }
    }
}
}