带有 UIScrollView 的图像滑块 [英] Image Slider with UIScrollView
本文介绍了带有 UIScrollView 的图像滑块的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在制作一个每 2 秒自动滑动一次的图像滑块.我写的代码立即移动到下一张没有幻灯片动画的图像,我想通过显示滚动视图滚动来以某种方式修复它,这是我的代码:
I am making an image slider that slides automatically every 2 seconds. The code I have wrote moves immediately to the next image without the slide animation, I want to fix it somehow by showing the scrollview scrolling, this is my code:
var imagesArray = [UIImage]()
static var i = 0
override func viewDidLoad() {
super.viewDidLoad()
imagesArray = [image1, image2, image3, image4]
for i in 0..<imagesArray.count{
let imageview = UIImageView()
imageview.image = imagesArray[i]
imageview.contentMode = .scaleAspectFit
let xPosition = self.view.frame.width * CGFloat(i)
imageview.frame = CGRect(x: xPosition, y: 0, width: self.imagesScrollView.frame.width, height: self.imagesScrollView.frame.height)
imagesScrollView.contentSize.width = imagesScrollView.frame.width * CGFloat(i+1)
imagesScrollView.addSubview(imageview)
}
}
override func viewDidAppear(_ animated: Bool) {
let scrollingTimer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(MenuViewController.newStartScrolling), userInfo: nil, repeats: true)
scrollingTimer.fire()
func newStartScrolling()
{
if MenuViewController.i == imagesArray.count {
MenuViewController.i = 0
}
let x = CGFloat(MenuViewController.i) * imagesScrollView.frame.size.width
imagesScrollView.contentOffset = CGPoint(x: x, y: 0)
MenuViewController.i += 1
}
谢谢.
推荐答案
请试试这个代码.
override func viewDidAppear(_ animated: Bool) {
imagesArray = [UIImage(named: "apple.jpg")!, UIImage(named: "empire.jpg")!, UIImage(named: "ottawa.jpg")!]
imagesScrollView.contentSize = CGSize(width: imagesScrollView.frame.width * CGFloat(imagesArray.count), height: imagesScrollView.frame.height)
for i in 0..<imagesArray.count{
let imageview = UIImageView()
imageview.image = imagesArray[i]
imageview.contentMode = .scaleAspectFill
imageview.clipsToBounds = true
let xPosition = self.imagesScrollView.frame.width * CGFloat(i)
imageview.frame = CGRect(x: xPosition, y: 0, width: self.imagesScrollView.frame.width, height: self.imagesScrollView.frame.height)
print(imageview)
imagesScrollView.addSubview(imageview)
}
let scrollingTimer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(ViewController.newStartScrolling), userInfo: nil, repeats: true)
scrollingTimer.fire()
}
func newStartScrolling()
{
if ViewController.i == imagesArray.count {
ViewController.i = 0
}
let x = CGFloat(ViewController.i) * imagesScrollView.frame.size.width
imagesScrollView.setContentOffset(CGPoint(x: x, y: 0), animated: true)
ViewController.i += 1
}
你必须使用 func setContentOffset(_ contentOffset: CGPoint, animation: Bool)
方法来使用动画改变内容偏移.
you have to use func setContentOffset(_ contentOffset: CGPoint, animated: Bool)
method to change content offset using animation.
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