Xcode 9 Swift 4 Playgrounds UIGestureRecognizer 不工作
Posted
技术标签:
【中文标题】Xcode 9 Swift 4 Playgrounds UIGestureRecognizer 不工作【英文标题】:Xcode 9 Swift 4 Playgrounds UIGestureRecognizer not working 【发布时间】:2018-01-06 17:35:44 【问题描述】:最近,我开始着手 WWDC 2018 提交。出于预期,我在一个 swift playground 文件中开始了我的项目(Apple 通常不接受应用程序提交)。大约两个月前,我将 Xcode 更新到了 9.2 版(9C40b)。这样做之后,我意识到我的手势识别器并没有在我的实时视图上工作。一切都在实时视图助手窗口上完美呈现和显示,但我的手势识别器根本没有响应。有没有人遇到过类似的问题,有没有人能够在 Xcode 9 中使用 Swift 4 的 Swift Playgrounds(我在下面附上了我的代码以供参考)?
//: A UIKit based Playground for presenting user interface
import UIKit
import PlaygroundSupport
class HomeViewController : UIViewController, UIGestureRecognizerDelegate
let cardViewOne = UIView()
let cardButtonOne = UIButton()
let cardViewTwo = UIView()
let cardButtonTwo = UIButton()
let cardViewThree = UIView()
let cardButtonThree = UIButton()
let cardViewControllerTitleLabel = UILabel()
override func loadView()
let view = UIView()
view.backgroundColor = .white
//Card One
cardViewOne.frame = CGRect(x: 0, y: 218, width: 375, height: 480)
cardViewOne.backgroundColor = #colorLiteral(red: 1, green: 0.1058823529, blue: 0.3607843137, alpha: 1)
cardButtonOne.frame = CGRect(x: 0, y: 0, width: 375, height: 47)
cardButtonOne.backgroundColor = UIColor(red:0.90, green:0.10, blue:0.31, alpha:0.0)
cardButtonOne.setTitle("About", for: .normal)
cardButtonOne.titleLabel?.font = UIFont(name: "Avenir-Black", size: 18)
cardViewOne.layer.shadowColor = UIColor.black.cgColor
cardViewOne.layer.shadowOpacity = 0.25
cardViewOne.layer.shadowOffset = CGSize.zero
cardViewOne.layer.shadowRadius = 40
cardViewOne.layer.shadowPath = UIBezierPath(rect: cardViewOne.bounds).cgPath
//Card Two
cardViewTwo.frame = CGRect(x: 0, y: 164, width: 375, height: 480)
cardViewTwo.backgroundColor = #colorLiteral(red: 0.8965349741, green: 0.0931719053, blue: 0.3287236417, alpha: 1)
cardButtonTwo.frame = CGRect(x: 0, y: 0, width: 375, height: 47)
cardButtonTwo.backgroundColor = UIColor(red:0.90, green:0.10, blue:0.31, alpha:0.0)
cardButtonTwo.setTitle("Mix", for: .normal)
cardButtonTwo.titleLabel?.font = UIFont(name: "Avenir-Black", size: 18)
cardViewTwo.layer.shadowColor = UIColor.black.cgColor
cardViewTwo.layer.shadowOpacity = 0.25
cardViewTwo.layer.shadowOffset = CGSize.zero
cardViewTwo.layer.shadowRadius = 40
cardViewTwo.layer.shadowPath = UIBezierPath(rect: cardViewTwo.bounds).cgPath
//Card Three
cardViewThree.frame = CGRect(x: 0, y: 109, width: 375, height: 480)
cardViewThree.backgroundColor = #colorLiteral(red: 0.8446810233, green: 0.08778301191, blue: 0.3097108647, alpha: 1)
cardButtonThree.frame = CGRect(x: 0, y: 0, width: 375, height: 47)
cardButtonThree.backgroundColor = UIColor(red:0.90, green:0.10, blue:0.31, alpha:0.0)
cardButtonThree.setTitle("Experiment", for: .normal)
cardButtonThree.titleLabel?.font = UIFont(name: "Avenir-Black", size: 18)
cardViewThree.layer.shadowColor = UIColor.black.cgColor
cardViewThree.layer.shadowOpacity = 0.25
cardViewThree.layer.shadowOffset = CGSize.zero
cardViewThree.layer.shadowRadius = 40
cardViewThree.layer.shadowPath = UIBezierPath(rect: cardViewThree.bounds).cgPath
cardViewControllerTitleLabel.text = "Vibe"
cardViewControllerTitleLabel.frame = CGRect(x: 158, y: 20, width: 81, height: 34)
cardViewControllerTitleLabel.font = UIFont(name: "Avenir-Black", size: 32)
cardViewControllerTitleLabel.textColor = #colorLiteral(red: 1, green: 0.1215686275, blue: 0.3529411765, alpha: 1)
//ViewController Title
cardViewOne.layer.zPosition = 3
cardViewTwo.layer.zPosition = 2
//z-index adjustment
view.addSubview(cardViewOne)
view.addSubview(cardViewTwo)
view.addSubview(cardViewThree)
cardViewOne.addSubview(cardButtonOne)
cardViewTwo.addSubview(cardButtonTwo)
cardViewThree.addSubview(cardButtonThree)
view.addSubview(cardViewControllerTitleLabel)
self.view = view
override func viewDidLoad()
let tap = UITapGestureRecognizer(target: self, action: #selector(handleTap))
tap.delegate = self
cardButtonTwo.addGestureRecognizer(tap)
print("Gesture recognizer added")
self.navigationController?.isNavigationBarHidden = true
@objc func handleTap(sender: UITapGestureRecognizer? = nil)
let detail = TestViewController()
navigationController?.pushViewController(detail, animated: true)
class TestViewController: UIViewController
let root = HomeViewController()
let nav = UINavigationController(rootViewController: root)
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = nav
【问题讨论】:
我不知道,为什么你使用了太多代码?您也可以通过设计来实现这一点。 @KhawarIslam 我正在考虑使用情节提要,但我无法正确编译它以用于 swift playground。 您使用了 StoryBard。如果您卡住了,请提出问题。 @KhawarIslam 那仍然没有回答我的问题。即便如此,在 Swift Playgrounds 文件中使用情节提要并不是设计 UI 原型的最有效方式。 创建一个 Xcode 项目而不是游乐场。这是制作原型的最佳方式。 【参考方案1】:您在卡片视图中使用了不正确的高度值。 将高度值更改为较小的值 47 有效:
cardViewOne.frame = CGRect(x: 0, y: 218, width: 375, height: 47)
cardViewTwo.frame = CGRect(x: 0, y: 164, width: 375, height: 47)
cardViewThree.frame = CGRect(x: 0, y: 109, width: 375, height: 47)
另外,因为cardButtonTwo
是UIButton
,所以您不需要使用UITapGestureRecognizer
。您可以简单地为touchUpInside
事件添加目标。
override func viewDidLoad()
cardButtonTwo.addTarget(self, action: #selector(HomeViewController.handleTap(sender:)), for: .touchUpInside)
self.navigationController?.isNavigationBarHidden = true
【讨论】:
@KawaiiFX:编辑了答案。您只需要更改视图的高度。另外,由于您使用的是按钮,因此无需添加 TapGestureRecognizer。以上是关于Xcode 9 Swift 4 Playgrounds UIGestureRecognizer 不工作的主要内容,如果未能解决你的问题,请参考以下文章
Xcode 9:使用 Swift 3.1 编译的模块无法在 Swift 4.0 中导入
Xcode 9 Swift 4 Playgrounds UIGestureRecognizer 不工作
Xcode 9.3(Swift 4.1)中的 Codable '没有初始化器'