数组中的UIImage名称不断返回nil值. [英] UIImage name from array keeps returning nil value.
问题描述
在容器内部设置页面视图.遵循了我可以找到的所有说明(初学者).
Setting up a page view inside of a container. Followed all instructions I could find (beginner).
这两个数组位于主视图控制器中，它们具有我要填充页面的图像的名称.
These two arrays are in the main view controller which have names of the images I want to populate the pages.
self.shirtImage = NSArray(objects: "shirt1", "shirt2")
self.pantsImage = NSArray(objects: "pants1", "pants2")
每当我运行程序时，这两行:
Whenever I run the program, these two lines:
self.todayShirt.image = UIImage(named: self.shirtName)
self.todayPants.image = UIImage(named: self.pantsName)
返回错误fatal error: unexpectedly found nil while unwrapping an Optional value或CUICatalog: Invalid asset name supplied:，这意味着它们以某种方式从数组接收nil值.
return the error fatal error: unexpectedly found nil while unwrapping an Optional value or CUICatalog: Invalid asset name supplied: which means somehow they are receiving a nil value from the arrays.
页面内容类如下:
class TodayPicksViewController: UIViewController {
@IBOutlet weak var todayShirt: UIImageView!
@IBOutlet weak var todayPants: UIImageView!
var pageIndex: Int!
var shirtName: String!
var pantsName: String!
override func viewDidLoad() {
super.viewDidLoad()
self.todayShirt.image = UIImage(named: self.shirtName)
self.todayPants.image = UIImage(named: self.pantsName)
和主视图控制器的设置如下:
and the main view controller is set up like this:
class ViewController: UIViewController, UIPageViewControllerDataSource {
var pageViewController: UIPageViewController!
var shirtImage: NSArray!
var pantsImage: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
self.shirtImage = NSArray(objects: "shirt1", "shirt2")
self.pantsImage = NSArray(objects: "pants1", "pants2")
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController
self.pageViewController.dataSource = self
let startVC = self.viewControllerAtIndex(0) as TodayPicksViewController
let viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers((viewControllers as! [UIViewController]), direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0, 30, self.view.frame.width, self.view.frame.height - 60)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
}
func viewControllerAtIndex(index: Int) -> TodayPicksViewController {
if ((self.shirtImage.count == 0) || index >= self.shirtImage.count){
return TodayPicksViewController()
}
let vc: TodayPicksViewController = self.storyboard?.instantiateViewControllerWithIdentifier("TodayPicksViewController") as! TodayPicksViewController
vc.shirtName = self.shirtImage[index] as! String
vc.pantsName = self.pantsImage[index] as! String
vc.pageIndex = index
return vc
}
我有另一个项目具有与此相似的工作页面视图，并且一切运行正常，并且我已完全复制了几乎所有内容，因此我无法弄清楚为什么主视图控制器中的值未正确传递给这个.任何帮助表示赞赏.
I have another project that has a working page view similar to this and everything works perfectly and I have copied over almost everything exactly so I cannot figure out why the value from the main view controller is not properly passing to the page view in this one. Any assistance is appreciated.
推荐答案
更改UIImageView的图像时出现了问题.尝试todayShirt.image = UIImage(imageLiteral: "\(shirtName)")和todayPants.image = UIImage(imageLiteral: "\(pantsName)").
Something is going wrong when you change the image of the UIImageView. Try todayShirt.image = UIImage(imageLiteral: "\(shirtName)") and todayPants.image = UIImage(imageLiteral: "\(pantsName)").
然后非常确定，您已在XCode项目中插入了4张图像:shirt1.png，shirt2.png，pants1.png和pants2.png.如果它们是shirt1.jpg等，也可以.
Then be very very sure that you have 4 images inserted in your XCode project: shirt1.png, shirt2.png, pants1.png, and pants2.png. It's also ok if they are shirt1.jpg, etc.
如果仍然不能解决问题，请尝试更改数组创建方法.只需使用创建数组&而不是使用NSArray并仅在viewdidload()部分中向其添加对象即可.在全局范围内添加对象.因此，现在在具有var shirtImage: NSArray和var shirtImage: NSArray的位置，将它们都删除，并添加var shirtsArray:NSMutableArray = ["shirt1", "shirt2"]和var pantsArray:NSMutableArray = ["pants1", "pants2"].
If this still isn't helping, try changing your array-creation method. Instead of using NSArray and only adding objects to it in the viewdidload() section, just create the arrays & add objects in the global scope. So, right now where you have var shirtImage: NSArray and var shirtImage: NSArray, remove both of those and add var shirtsArray:NSMutableArray = ["shirt1", "shirt2"] and var pantsArray:NSMutableArray = ["pants1", "pants2"].
这篇关于数组中的UIImage名称不断返回nil值.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
