【发布时间】：2017-04-21 19:12:49
【问题描述】：
我尝试在 Interface Builder 的 HomeViewcontroller 中添加我的 customView。这是故事板的截图：
所有网点都链接到 CarouselView IBOutlets。
这里是 UIView 文件（Interface Builder 的屏幕截图中的轮播视图）：
CarouselScrollView.swift
import UIKit
class CarouselView: UIView {
@IBOutlet weak var assignmentStatusLabel: UILabel!
@IBOutlet weak var assignmentCustomerLabel: UILabel!
@IBOutlet weak var assignmentAgencyLabel: UILabel!
@IBOutlet weak var assignmentPeriodLabel: UILabel!
@IBOutlet weak var nextAssignmentButton: UIButton!
@IBOutlet weak var previousAssignmentButton: UIButton!
init(frame: CGRect, _ status: String, _ customer: String, _ agency: String, _ period: String) {
super.init(frame: frame)
self.setupView("status", "customer", "agency", "period")
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
func setupView(_ status: String, _ customer: String, _ agency: String, _ period: String) {
// self.assignmentStatusLabel.text = status
// self.assignmentCustomerLabel.text = customer
// self.assignmentAgencyLabel.text = agency
// self.assignmentPeriodLabel.text = period
}}
这里是我的 ViewController，我用 3 个 CarouselView 填充我的滚动视图：
import UIKit
class HomeViewController: BaseViewController, HomeView {
@IBOutlet weak var carouselScrollView: UIScrollView!
@IBOutlet weak var carouselView: CarouselView!
var presenter: HomePresenter?
var currentAssignmentView: Int = 0
// create array of assignments for test
let arrayOfAssignments = [["status":"Mission en cours", "customer":"customer1", "agency":"bourg", "startDate":"09-05-2016", "endDate":"10-05-2016"],
["status":"Mission à venir", "customer":"customer2", "agency":"agency paris", "startDate":"09-01-2017", "endDate":"03-04-2017"],
["status":"Mission passée", "customer":"customer3", "agency":"agency lyon", "startDate":"09-09-2017", "endDate":"29-05-2018"]
]
override func initPresenter() -> BasePresenter {
let presenter = HomePresenter(self, Navigator(self))
self.presenter = presenter
return presenter
}
override func setup() {
self.navBarTitleImageSetup()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
self.scrollViewSetup()
}
func scrollViewSetup() {
let carouselScrollViewWidth:CGFloat = self.carouselScrollView.frame.width
let carouselScrollViewHeight:CGFloat = self.carouselScrollView.frame.height
let numberOfAssignments = self.arrayOfAssignments.count
self.carouselScrollView.contentSize = CGSize(width: carouselScrollViewWidth * CGFloat(numberOfAssignments), height: carouselScrollViewHeight)
for i in 0...numberOfAssignments - 1 {
let carouselView = CarouselView(frame: CGRect(x: carouselScrollViewWidth * CGFloat(i), y: CGFloat(0), width: carouselScrollViewWidth, height: carouselScrollViewHeight), "iuhiuh", "oiojoij", "iuhiuh", "iuhiuhiuh")
switch i {
case 0:
carouselView.backgroundColor = UIColor.blue
case 1:
carouselView.backgroundColor = UIColor.yellow
case 2:
carouselView.backgroundColor = UIColor.gray
default:
break
}
self.carouselScrollView.addSubview(carouselView)
}
self.carouselScrollView.delegate = self
}
func navBarTitleImageSetup() {
let image: UIImage = #imageLiteral(resourceName: "NavLogo")
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 97, height: 24))
imageView.contentMode = .scaleAspectFit
imageView.image = image
self.navigationItem.titleView = imageView
}}
extension HomeViewController: UIScrollViewDelegate {
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let viewWidth: CGFloat = self.carouselScrollView.frame.width
let currentAssignmentNumber: CGFloat = floor((self.carouselScrollView.contentOffset.x - viewWidth/2)/viewWidth)+1
self.currentAssignmentView = Int(currentAssignmentNumber)
}}
当我像这样构建和运行时，我可以滚动滚动视图（添加了 3 个视图）但没有标签（正常，因为已评论）：
但是当我在 CarouselScrollView.swift 文件中取消注释其中一行时：
// self.assignmentStatusLabel.text = status
// self.assignmentCustomerLabel.text = customer
// self.assignmentAgencyLabel.text = agency
// self.assignmentPeriodLabel.text = period
我在控制台中有这个错误：
致命错误：在展开可选值时意外发现 nil
我不明白为什么我的标签是nil。一切似乎都很好。有人有解决方案或想法吗？提前感谢您的时间和帮助。
【问题讨论】：
-
检查标签是否正确连接到 Interface Builder 中的插座。
-
谢谢你，但已经做了几次，问题不在于。
-
也许您在调用
awakeFromNib之前使用了标签。 -
不要在 Storyboard 中创建自定义视图，而是尝试在单独的 Nib 文件中创建它们。
-
Paramasivan Samuttiram 我按照你的建议做了，但我希望有另一种解决方案，以便能够将 customView 保留在我的 Storyboard 中（将其保留在我的 HomeController 上方）。然后在 CarouselView 我添加了这个：class func instanceFromNib() -> UIView { return UINib(nibName: "CarouselView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as！ UIView } 和 HomeViewController 我在循环中实例化了我的 3 个自定义视图：让 carouselView = CarouselView.instanceFromNib() 为！ CarouselView 谢谢，
标签： ios swift uiview uiscrollview