编译器不喜欢使用Swift的UIScrollViewDelegate [英] Compiler not liking UIScrollViewDelegate with Swift

问题描述

在将 UIScrollView 实现到 UITableViewCell 时，我收到错误。

I am getting an error, when implementing a UIScrollView into a UITableViewCell.

class MyItemTableViewCell: UITableViewCell, UIScrollViewDelegate {

...  

var scrollView: UIScrollView = {
        let scroll = UIScrollView()
        scroll.showsHorizontalScrollIndicator = false
        scroll.delegate = self
        return scroll;
        }()

...

func scrollViewDidScroll(scrollView: UIScrollView!) {
     ...   
    }

func scrollViewWillEndDragging(scrollView: UIScrollView!, velocity: CGPoint, targetContentOffset: CMutablePointer<CGPoint>) {
     ...   
    }
...
}

编译器在行上给出了一个错误 scroll.delegate = self 说类型MyItemTableViewCell不符合协议'UIScrollViewDelegate'

The compiler gives me an error on the line scroll.delegate = self saying that the Type MyItemTableViewCell does not conform to protocol ‘UIScrollViewDelegate’

没关系这个事实，协议中的方法都记录为可选（ https://developer.apple.com/library/prerelease/iOS/documentation/UIKit/Reference/UIScrollViewDelegate_Protocol/index.html ），但我实施了两个。

Never mind the fact, that the methods in the protocol are all documented as optional (https://developer.apple.com/library/prerelease/iOS/documentation/UIKit/Reference/UIScrollViewDelegate_Protocol/index.html), but I have two implemented.

编译器对我有什么要求？

What does the compiler want from me?

谢谢

推荐答案

在初始化循环期间，在初始化所有属性之前，self不可用。将其更改为：

During the init cycle, self isn't usable until all properties have been initialized. Change it to:

class MyItemTableViewCell: UITableViewCell, UIScrollViewDelegate {

    var scrollView: UIScrollView

    func scrollViewDidScroll(scrollView: UIScrollView!) {
    }

    func scrollViewWillEndDragging(scrollView: UIScrollView!, velocity: CGPoint, inout targetContentOffset: CGPoint) {
    }

    init() {
        scrollView = UIScrollView()
        scrollView.showsHorizontalScrollIndicator = false
        super.init(style:UITableViewCellStyle.Default, reuseIdentifier:"cell")
        scrollView.delegate = self
    }
}

这篇关于编译器不喜欢使用Swift的UIScrollViewDelegate的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！