从 ViewController 调用 UIView 方法答案

【问题标题】：Call UIView method from ViewController从 ViewController 调用 UIView 方法
【发布时间】：2016-07-31 10:37:37
【问题描述】：

我为折线图和条形图创建了两个单独的 xib 文件，并将其链接到我场景中的视图。我根据数据类型分配了笔尖。我的 UIView 类中有一个函数 setChart()，我需要从 ViewController 调用它来绘制图表。

如何从我的 ViewController 调用函数 setChart()？我的代码不起作用

UIView：

class BarChartDashboard: UIView {

@IBOutlet weak var barChartView: BarChartView!

override func awakeFromNib() {
    .....
}

func setChart(dataPoints: [String], values: [Double]) {

    .....
}


}

视图控制器：

class DetailDashboardViewController: UIViewController {

@IBOutlet weak var chartView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()

    runQueries(2)

    if index != 3{
        chartView = NSBundle.mainBundle().loadNibNamed("BarChartDashboard", owner: self, options: nil)[0] as? UIView
    }
    else{
        chartView = NSBundle.mainBundle().loadNibNamed("LineChartDashboard", owner: self, options: nil)[0] as? UIView
    }
}
}

private extension DetailDashboardViewController {

func runQueries(period: Int) {

    self.query(false, periodIndex: period){ (success) -> Void in
        if success {
            // do second task if success
            dispatch_async(dispatch_get_main_queue(), {
                if self.index != 3{
                    (self.chartView as! BarChartDashboard).setChart(self.yAxis, values: self.xAxis)
                }
                else{
                    (self.chartView as! LineChartDashboard).setChartData(self.yAxis, yAxisMax: self.xAxisMax, yAxisMin : self.xAxisMin)
                }
            })
        }
    }
}


func query(min: Bool, periodIndex: Int, completion: (success: Bool) -> Void) {
    .......
}

}

【问题讨论】：

标签： ios swift uiview

【解决方案1】：

在您的 ViewController 中创建一个新变量 chart 并将此图表作为 subView 添加到从 xib 连接的 view outlet

您的 ViewController 类如下所示：

class DetailDashboardViewController: UIViewController {

@IBOutlet weak var chartView: UIView!
var chart: UIView!

override func viewDidLoad() {
    super.viewDidLoad()

        if index != 3{
            chart = NSBundle.mainBundle().loadNibNamed("BarChartDashboard", owner: self, options: nil)[0] as? BarChartDashboard
     }
        else{
            chart = NSBundle.mainBundle().loadNibNamed("LineChartDashboard", owner: self, options: nil)[0] as? LineChartDashboard
        }

    self.chartView.addSubView(chart)
    self.chart.frame = self.chartView.bounds
    runQueries(2)
    }

private extension DetailDashboardViewController {

func runQueries(period: Int) {

    self.query(false, periodIndex: period){ (success) -> Void in
        if success {
            // do second task if success
            dispatch_async(dispatch_get_main_queue(), {
                if self.index != 3{
                    (self.chart as! BarChartDashboard).setChart(self.yAxis, values: self.xAxis)
                }
                else{
                    (self.chart as! LineChartDashboard).setChartData(self.yAxis, yAxisMax: self.xAxisMax, yAxisMin : self.xAxisMin)
                }
            })
        }
    }
}

【讨论】：

【解决方案2】：

在您的DetailDashboardViewController 中，您已将视图实例设置为UIView 类型，而您的自定义UIView 类名为BarChartDashboard，因此为了能够调用方法setChart()，您应该设置您在类检查器中的视图类为 BarChartDashboard 以及您的 DetailDashboardViewController 实例变量应更改如下：

@IBOutlet weak var chartView: BarChartDashboard!

所以现在实例变量的类型是BarChartDashboard，现在可以从您的DetailDashboardViewController 调用方法setChart()。

在你的DetailDashboardViewController

@IBOutlet weak var chartView: BarChartDashboard!
override func viewDidLoad() {
     super.viewDidLoad()

     runQueries(2)

     if index != 3{
        chartView = NSBundle.mainBundle().loadNibNamed("BarChartDashboard", owner: self, options: nil)[0] as? UIView
     }
     else{
        chartView = NSBundle.mainBundle().loadNibNamed("LineChartDashboard", owner: self, options: nil)[0] as? UIView
     }
     chartView.setChart(dataPoints: ["hello","world"], values: [20.0,21.5])
}

【讨论】：