ios - 单击按钮时无法播放一系列图像

Question

我正在尝试通过单击下一步按钮来播放动画图像的分离图像。图像名称作为字符串存储在数组中。当我点击下一步按钮时，图像转换是第一次发生。下一次，它不会发生。当我尝试打印 i 的值以检查单击下一个按钮时发生的情况时，该值没有增加。下面是我的代码:

    import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var image2: UIImageView!
    // @IBOutlet weak var imageView1: UIImageView!

  //        img1.image=UIImage(named:"frame2.gif")

    @IBAction func next(_ sender: Any) {
        var imgarray=["frame2.gif","frame3.gif","frame4.gif","frame5.gif","frame6.gif"]
        var i=0
        if i<7{
            image2.image=UIImage(named:imgarray[i])
            i+=1
        }
        else if i>=7{
            i=0
        }
               print(i)
    }

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


}

Answer 1

将 var i=0 放在按钮操作之外。否则，当您点击按钮时，您的 i 将始终重新初始化为 0

import UIKit

class ViewController: UIViewController {

var i=0
    @IBOutlet weak var image2: UIImageView!
    // @IBOutlet weak var imageView1: UIImageView!

  //        img1.image=UIImage(named:"frame2.gif")

    @IBAction func next(_ sender: Any) {
        var imgarray=["frame2.gif","frame3.gif","frame4.gif","frame5.gif","frame6.gif"]

        if i<7{
            image2.image=UIImage(named:imgarray[i])
            i+=1
        }
        else if i>=7{
            i=0
        }
               print(i)
    }

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


}