我有一组图像,我正在使用滚动视图移动图像,所有工作都很精细。 因为我是Swift的新手所以现在我需要一个解决方案,当图像移动时,我如何检查图像总数中显示的图像编号(或图像索引编号),然后相应地更新导航栏。
以下是我正在寻找的附件样本:
移动图片代码
class ImageScrollViewController: UIViewController {
@IBOutlet weak var mainScrollView: UIScrollView!
var imageArray = [UIImage]()
override func viewDidLoad() {
//mainScrollView.frame = view.frame
imageArray.append(UIImage(named: "nature-2")!)
imageArray.append(UIImage(named: "nature")!)
imageArray.append(UIImage(named: "nature4")!)
imageArray.append(UIImage(named: "nature5")!)
imageArray.append(UIImage(named: "nature6")!)
for i in 0..<imageArray.count{
let imageView = UIImageView()
imageView.image = imageArray[i]
imageView.contentMode = .scaleAspectFit
let xPosition = (self.view.frame.width * CGFloat(i)) + CGFloat(8)
imageView.frame = CGRect(x: xPosition , y: 0, width: self.mainScrollView.frame.width - CGFloat(16), height: self.mainScrollView.frame.height)
mainScrollView.contentSize.width = mainScrollView.frame.width * CGFloat(i+1)
mainScrollView.addSubview(imageView)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
希望你们这些人,理解我的问题。 任何帮助将不胜感激。
先谢谢。
答案 0 :(得分:0)
您可以使用..... .on(click, function (){
headers: { 'X-CSRF-TOKEN': $('meta[name="csrf_token"]').attr('content') },
$.ajax({
url: "adminUser/exportselected/1",
type:'POST', data: {selected:selected,
selectedField:selectedField},
dataType : "json",
success: function(data) { window.location = data.path; if($.isEmptyObject(data.error)){ //alert(data); }else{ //alert(data.error); } } });
在contentOffset
方法UIScrollViewDelegate
中持续跟踪排名。
因此,如果屏幕宽度为1000px:
scrollViewDidScroll
下面,func scrollViewDidScroll(_ scrollView: UIScrollView) {
// how far from beginning of scrollView (ex: user scrolls 3300px to the right)
let scrollDistance = mainScrollView.contentOffset.x
// size of 1 image (each is 1000px wide + 8px spacing between images)
let sizeOfOneImage = self.view.frame.width + 8
// number of images scrolled (3300px scrolled right = ~3.3 images scrolled so far...)
let numberOfScreensScrolled = scrollDistance / sizeOfOneImage
// floor(#) turns 3.3 into 3 (removes everything after decimal)
var imageInteger = floor(numberOfScreensScrolled)
// need +1, or else 1st image will be "0", 2nd image will be "1", etc.
imageInteger = imageInteger + 1
// # / total
self.title = "\(imageInteger)/\(imageArray count)"
}
存在,当下一个图像的~50%出现在屏幕上时,可以转换到下一个数字(可以更改为最好的)。
+ self.view.frame.width/2