我想要的是某些NSObjectProtocol的自动实现委托方法符合某些协议,但我努力,但没有完成它。
演示低于
更新更准确
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我有一个协议PagedLoadable
来获取collectionView需要的信息,然后是extension NSObjectProtocol where Self: Delegatable
,对象实现的自动配置PagedLoadable
protocol PagedLoadable {
var count: Int { get }
}
protocol Delegatable: UICollectionViewDelegate, UICollectionViewDataSource {
}
extension PagedLoadable where Self: Delegatable {
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return count
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = UICollectionViewCell()
return cell
}
}
class vc: UIViewController {
}
extension vc: PagedLoadable {
var count: Int {
return 1
}
}
extension vc: Delegatable {
}
答案 0 :(得分:0)
创建协议
// Class SurveyDownloadHandler
protocol SurveyDownloadHandlerDelegate {
func surveyDownloadSuccessfully(notiExpireRemainingTime : Int)
func surveyDownloadConnectionFail()
}
class SurveyDownloadHandler: NSObject {
var delegate: SurveyDownloadHandlerDelegate! = nil
}
//用于将方法调用回A类delegate.surveyDownloadSuccessfully(notiExpireRemainingTime)
// A类
class A : UIViewController,SurveyDownloadHandlerDelegate{
let surveyDownloadHandlerObject : SurveyDownloadHandler = SurveyDownloadHandler()
@IBAction func onTapClick(sender: AnyObject) {
self.surveyDownloadHandlerObject.delegate = self
self.surveyDownloadHandlerObject.startDownloadingSurvey()
}
}
func surveyDownloadSuccessfully(notiExpireRemainingTime : Int)
{
}
func surveyDownloadConnectionFail()
{
}
}
答案 1 :(得分:0)
您正尝试实现协议扩展,但继承除外。经过一些实验后,我可以通过以下方法删除您的错误。
//: [Next](@next)
protocol PagedLoadable {
var count: Int { get }
}
protocol Delegatable: UICollectionViewDelegate, UICollectionViewDataSource {
}
extension Delegatable {
}
//Removed since code will not be able to resolve dependency
extension PagedLoadable /*where Self: Delegatable*/ {
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return count
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = UICollectionViewCell()
return cell
}
}
//一种方法是
class vc: UIViewController,PagedLoadable, Delegatable {
var count: Int {
return 1
}
}
//或者你也可以这样做
extension vc: PagedLoadable, Delegatable {
var count: Int {
return 1
}
}