我的应用程序的背景有一系列图像。如何让它们以 1 秒的间隔自动更改？

Posted 2023-02-23

【中文标题】我的应用程序的背景有一系列图像。如何让它们以 1 秒的间隔自动更改？

【英文标题】：I have array of images for the background on my app. How can I make them change automatically with interval 1 sec?

【发布时间】：2017-04-05 12:38:01

【问题描述】：

我的应用中有一系列图片作为背景。如何让它们以 1 秒的间隔自动更改？

let myImagesArray = [UIImage(named:"1.png"),UIImage(named:"2.png"),UIImage(named:"3.png")

【参考方案1】：

您可以使用 animationImages。

//if you programmatically create your image view
let iv=UIImageView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
view.addSubview(iv)

//assign your images to your image view
let myImagesArray=[UIImage(named:"1.png"),UIImage(named:"2.png"),UIImage(named:"3.png")]
iv.animationImages=myImagesArray
iv.animationDuration=1*myImagesArray.count
//to make it loop infinitely
iv.animationRepeatCount=0 
iv.startAnimating()

【讨论】：

xcode 让我将其更改为： super.viewDidLoad() let iv = UIImageView() let myImagesArray = [UIImage(named:"1.png"),UIImage(named:"2.png" ),UIImage(named:"3.png")] 但它仍然不起作用。 iv.animationImages = myImagesArray 为！ [UIImage] iv.animationDuration = TimeInterval(1 * myImagesArray.count) //使其循环 iv.animationRepeatCount=0 iv.startAnimating()

什么不完全有效？我假设你放了一个 UIImageView 来显示你的背景图片？您是通过编程方式还是从情节提要中进行操作？您可以在 viewDidLoad 中启动图像，但也许您应该在 viewDidAppear 中调用 iv.startAnimating()。

另外@ЮлияКордюкова 也许你应该从 iv.animationRepeatCount=10 开始看看它是否有效，然后替换为 iv.animationRepeatCount=0

我是这样做的：backgroundImageView.animationImages = [UIImage(named: "IMG_8667")!, UIImage(named:"IMG_8658")!, UIImage(named: "IMG_8670")!] backgroundImageView .animationDuration = 1.0 //使其循环 backgroundImageView.animationRepeatCount = 0 backgroundImageView.startAnimating()

@ЮлияКордюкова 太好了，它会无限循环吗？如果可行，请不要忘记将我的答案标记为正确的答案；）

【参考方案2】：

使用 NSTimer

https://developer.apple.com/reference/foundation/nstimer/1412416-scheduledtimerwithtimeinterval

var iNSTimer = NSTimer.scheduledTimerWithTimeInterval(60.0,target: self, selector: Selector("methodName"), userInfo: nil, repeats: true)

func methodName() 

   //This Method Execute after every 60 sec.

【参考方案3】：

使用 NSTimer 检测 1 秒是否结束。此代码将从数组中获取随机图像并将其放入背景中的 imageView 中

Swift 3.0

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool 
    //SNIP, some code to setup the windos.   
    Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(self.handleTimer), userInfo: nil, repeats: true)
    return true


func handle(_ timer: Timer) 
        // Hanlde the timed event.
    var rnd: UInt32 = arc4random_uniform(imageArray.count)
    var imageName: String? = (tips[rnd] as? String)
    imageView.image = UIImage(named: imageName)


    - (void) handleTimer:(NSTimer *)timer 
        // Hanlde the timed event.

        uint32_t rnd = arc4random_uniform([imageArray count]);

        NSString *imageName = [tips objectAtIndex:rnd];
        imageView.image=[UIImage imageNamed:imageName]
    

斯威夫特 2.2

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool 
    //SNIP, some code to setup the windos.   
    NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: #selector(self.handleTimer), userInfo: nil, repeats: true)
    return true


func handleTimer(timer: NSTimer) 
        // Hanlde the timed event.
    var rnd = arc4random_uniform(imageArray.count)
    var imageName = tips[rnd]
    imageView.image! = UIImage(named: imageName)!

【讨论】：

谢谢！还有什么更简单的吗？我完全是初学者。

是 swift 吗？