我创建了导航自定义类,我想装饰它,我拿了Navdecoration.
swift类并声明了下面代码中显示的扩展,我在这个函数中添加了搜索条形码,我想在这个扩展中设置搜索栏代理但是它的给定错误不能指定类型’UIViewController’来键入’UISearchBarDelegate
extension UINavigationController {
func makeBlackNavigationbar (viewController: UIViewController,animated: Bool) {
viewController.navigationController?.navigationBar.backgroundColor? = UIColor.blackColor()
let add = UIBarButtonItem(barButtonSystemItem: .Add,target: viewController,action: "addTapped")
let play = UIBarButtonItem(title: "Play",style: .Plain,action: "addTapped")
viewController.navigationItem.rightBarButtonItems = [add,play]
let left = UIBarButtonItem(barButtonSystemItem: .Add,action: "addTapped")
viewController.navigationItem.leftBarButtonItems = [left]
let searchBar = UISearchBar(frame: CGRectZero)
searchBar.placeholder = "Search"
searchBar.delegate = viewController
viewController.navigationItem.titleView = searchBar
}}
解决方法
您必须符合UISearchBarDelegate协议：
extension UINavigationController : UISearchBarDelegate {
...
}