Question

使用shinobi图表

寻找示例如何添加手势识别器（在触摸屏上）以勾选标记和schart annoations

我看到了与系列数据系列交互的文档，但我需要将GestureRecognizers添加到刻度标记和注释事件

我尝试使用tickMark / datapoint标签而没有运气：

 func sChart(chart: ShinobiChart!, alterTickMark tickMark: SChartTickMark!, beforeAddingToAxis axis: SChartAxis!) {

    if let label = tickMark.tickLabel {
        //added a gesture recognizer here but it didn't work
    }

对于SchartAnnotations，不知道如何添加一个

Answer 1

我认为你几乎带着标签。我发现我只需要设置userInteractionEnabled = true例如

func sChart(chart: ShinobiChart!, alterTickMark tickMark: SChartTickMark!, beforeAddingToAxis axis: SChartAxis!) {
    if let label = tickMark.tickLabel {

        let tapRecognizer = UITapGestureRecognizer(target: self, action: "labelTapped")
        tapRecognizer.numberOfTapsRequired = 1
        label.addGestureRecognizer(tapRecognizer)

        label.userInteractionEnabled = true
    }
}

注释有点棘手，因为它们位于SChartCanvasOverlay（负责监听手势）下方的视图上。这会导致手势被吞噬。在他们得到注释之前。

但是，您可能需要在图表中添加UITapGestureRecognizer，然后循环显示图表的注释，以检查触摸点是否在注释中。 E.g：

在viewDidLoad中：

let chartTapRecognizer = UITapGestureRecognizer(target: self, action: "annotationTapped:")
chartTapRecognizer.numberOfTapsRequired = 1
chart.addGestureRecognizer(chartTapRecognizer)

然后是annotationTapped函数：

func annotationTapped(recognizer: UITapGestureRecognizer) {

    var touchPoint: CGPoint?

    // Grab the first annotation so we can grab its superview for later use
    if let firstAnnotation = chart.getAnnotations().first as? UIView {
        // Convert touch point to position on annotation's superview

        let glView = firstAnnotation.superview!

        touchPoint = recognizer.locationInView(glView)
    }

    if let touchPoint = touchPoint {

        // Loop through the annotations
        for item in chart.getAnnotations() {
            let annotation: SChartAnnotation = item as SChartAnnotation

            if (CGRectContainsPoint(annotation.frame, touchPoint as CGPoint)) {
                chart.removeAnnotation(annotation)
            }
        }
    }
}

ShinobiCharts数据标签/注释/ Tick Mark手势识别器

1 个答案: