Question

我已经实现了switch语句。现在，我正在努力添加一个双击手势，以显示更多有关从开关中选择的盒子的信息。

#here's the data
df <- structure(list(`Year` = c(2012, 2012, 2012, 2013, 2013, 2013, 2014, 2014, 2014), 
                 `continent` = c("Africa", "Asia", "Europe", "Africa", "Asia", "Europe", "Africa", "Asia", "Europe"),
                 `Cash` = c(400000, 410000, 200000, 300000, 500000, 250000, 400000, 600000, 500000)),
            row.names = c(NA, -9L), class = c("tbl_df", "tbl", "data.frame"))



#here's my attempt at plotting it
ggplot(df, aes(Year, Cash, group = continent)) +
  geom_line(aes(colour = continent)) +
  geom_segment(aes(xend = 2012, yend = Cash), linetype = 2, colour = 'grey')+
  geom_point(size = 2, colour = "white") + 
  geom_text(aes(x = 2012.1, label = continent), hjust = 0)+
  transition_reveal(continent, Year) + 
  coord_cartesian(clip = 'off') + 
  theme(plot.margin = margin(5.5, 40, 5.5, 5.5), legend.position = "none")
#I am getting the error below
Error in ggproto(NULL, TransitionReveal, params = list(along_quo = along_quo,  : 
  object 'Year' not found

#when I remove continent from transition_reveal, i get a plot but it doesn't look nice at all.
#I would like to plot something similar to the picture below

Answer 1

我只写一些示例代码。希望对您有所帮助。

就像下面的代码一样，您可以使用双击动作。

class ViewController: UIViewController {

    var singleTap: UITapGestureRecognizer!
    var doubleTap: UITapGestureRecognizer!

    override func viewDidLoad() {
        super.viewDidLoad()

        doubleTap = UITapGestureRecognizer(target: self, action: #selector(tap(gesture:)))
        view.addGestureRecognizer(doubleTap)
        doubleTap.numberOfTapsRequired = 2
        doubleTap.delaysTouchesBegan = true

        singleTap = UITapGestureRecognizer(target: self, action: #selector(tap(gesture:)))
        singleTap.delaysTouchesBegan = true
        singleTap.require(toFail: doubleTap)
        view.addGestureRecognizer(singleTap)
    }

    @objc
    func tap(gesture: UITapGestureRecognizer) {
        switch gesture {
        case singleTap:
            moreInfo(option: 1)
        case doubleTap:
            moreInfo(option: 2)
        default:
            print("---")
        }
    }

    func moreInfo(option: Int) {
        switch option {
        case 1:
            print("more information for 1")

        case 2:
            print("more information for 2")
        default:
            print("---")
        }
    }
}

如何实施双击以采取进一步措施，如了解更多信息？

1 个答案: