Question

我正在努力学习ScrollView的工作方式。我在scrollview上观看视频教程，你必须添加一个scrollview，然后是UIView，然后添加约束，并将View Controller设置为自由形式，并将高度设置为1000.

在我的应用中，我正在加载3张优惠券，这些优惠券是图片视图，这些图片视图是以编程方式设置的。这是代码，任何人都可以帮我滚动浏览器？感谢。

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var scrollView: UIScrollView!

@IBOutlet weak var UIView: UIView!

struct MyCoupons {
    static var couponsString: UIImage?
    static var siteCoupons: [String?] = []
    static var count: Int = 0
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewDidAppear(_ animated: Bool) {
    var i: Int = 0
    var x: Int = 0
    var y: Int = 0
    var width: Int = 0
    var height: Int = 0

    ViewController.PopulateDataCoupons()

    i=0
    height = 300
    repeat {
        let imageName = MyCoupons.siteCoupons[i]//"Coupons1.jpg"
        let image = UIImage(named: imageName!)
        let imageView = UIImageView(image: image!)

        y = i * height + 50
        imageView.frame = CGRect(x: 50, y: y, width: 250, height: 300)

        view.addSubview(imageView)
        i += 1

    }
        while (i < MyCoupons.count-1)
}

public class func PopulateDataCoupons() {
    var i = 0
    var abc: String


    if let path = Bundle.main.path(forResource: "Coupons", ofType: "txt") {
        do {
            let data = try String(contentsOfFile: path, encoding: .utf8)
            let myStrings = data.components(separatedBy: .newlines)
            abc = myStrings.joined(separator: ",")

            let couponsArr = abc.components(separatedBy: ",")
            print("couponsArr.count", couponsArr.count)

            repeat {
                MyCoupons.siteCoupons.append(couponsArr[i])
                i+=1
            } while i < ((couponsArr.count)-1)

            MyCoupons.count = couponsArr.count
        } catch {
            print(error)
        }
    }

}

}

Answer 1

您将图像添加到viewController的视图中，而不是添加到scrollView中您的viewController高度为1000，每张图像的垂直偏移量为50 它是这样的：
50 + 300 + 50 + 300 + 50 + 300 = 1050
它超过1000

Answer 2

使用以下代码

 let bottomOffset = CGPoint(x: 0, y: self.scrollView.contentSize.height - self.scrollView.bounds.size.height)
     self.scrollView.setContentOffset(bottomOffset, animated: true)

Scrollview不会滚动到底部

2 个答案: