在 ScrollView 中加载自定义 UIView
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【中文标题】在 ScrollView 中加载自定义 UIView【英文标题】:Load Custom UIView in ScrollView 【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,
【参考方案1】:
如果您在将carouselView
添加为子视图后调用setupView
,则该问题将得到解决,因为只有在添加为子视图后,您的标签才会被初始化。
【讨论】:
如何在不制作 2 个循环而不是 1 个循环的情况下做到这一点?比你用户3057272 如果你在谈论'for'循环,那么你应该在'setupView'中创建一个跟踪它的属性【参考方案2】:就像 Paramasivan Samuttiram 所说,我必须在单独的 Nib(.xib) 文件中创建我的 customView。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),但这确实成功了。
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
现在 CarouselView 文件如下所示:
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!
class func instanceFromNib() -> UIView
return UINib(nibName: "CarouselView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView
override init(frame: CGRect)
super.init(frame: frame)
required init?(coder aDecoder: NSCoder)
super.init(coder: aDecoder)
在 HomeViewController 中,我在 func scrollViewSetup 的循环中实例化了我的 3 个自定义视图:
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.instanceFromNib() as! CarouselView
carouselView.frame = CGRect(x: carouselScrollViewWidth * CGFloat(i), y: CGFloat(0), width: carouselScrollViewWidth, height: carouselScrollViewHeight)
carouselView.assignmentStatusLabel.text = self.arrayOfAssignments[i]["status"]
carouselView.assignmentCustomerLabel.text = self.arrayOfAssignments[i]["customer"]?.uppercased()
carouselView.assignmentAgencyLabel.text = self.arrayOfAssignments[i]["agency"]?.uppercased()
carouselView.assignmentPeriodLabel.text = "\(self.arrayOfAssignments[i]["startDate"]!) - \(self.arrayOfAssignments[i]["endDate"]!)"
self.carouselScrollView.addSubview(carouselView)
self.carouselScrollView.delegate = self
现在一切正常。
谢谢大家,
【讨论】:
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