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如何在UIScrollView中实现缩放图像?

我的ScrollView运行顺畅.我有资产库中的图像.名称从1开始并结束39.我想放大我的图像.我尝试了不同的方法,但我不能成功.

这是我的代码:

import UIKit

class fotolarView: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var mainScroolView: UIScrollView!

    var imageArray = [UIImage]()

    override func viewDidLoad() {
        super.viewDidLoad()

        mainScroolView.delegate = self
        mainScroolView.frame = view.frame

        imageArray = [#imageLiteral(resourceName: "1"), #imageLiteral(resourceName: "2"), #imageLiteral(resourceName: "3"), #imageLiteral(resourceName: "4"), #imageLiteral(resourceName: "5"), #imageLiteral(resourceName: "6"), #imageLiteral(resourceName: "7"), #imageLiteral(resourceName: "10"), #imageLiteral(resourceName: "8"), #imageLiteral(resourceName: "9"), #imageLiteral(resourceName: "11"), #imageLiteral(resourceName: "12"), #imageLiteral(resourceName: "20"), #imageLiteral(resourceName: "13"), #imageLiteral(resourceName: "21"), #imageLiteral(resourceName: "22"), #imageLiteral(resourceName: "15"), #imageLiteral(resourceName: "23"), #imageLiteral(resourceName: "16"), #imageLiteral(resourceName: "31"), #imageLiteral(resourceName: "24"), #imageLiteral(resourceName: "17"), #imageLiteral(resourceName: "25") , #imageLiteral(resourceName: "32"), …
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zooming uiscrollview uiimageview ios swift3

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