我使用了一些图形库并将网页加载到我的 Swift 项目中的 UIWebview 中。
是否可以从 Swift UIViewController 更新 HTML 文件图表 Y 轴值。
如果可能的话，请给我一些例子。
更多信息请在下面找到代码和快照。
Startup.html
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
window.onload = function () {
// initial values of dataPoints
var dps = [
{label: "Management Wing", y: 125} ,
{label: "Production Lab", y: 332},
{label: "Cafeteria", y: 55},
{label: "Library", y: 46},
{label: "Recreation Centre", y: 32}
];
alert(dps.y);
var totalEmployees = "Total people on campus: 590";
var chart = new CanvasJS.Chart("chartContainer",{
theme: "theme2",
title:{
text: "People On Campus"
},
axisY: {
title: "Number of People"
},
legend:{
verticalAlign: "top",
horizontalAlign: "centre",
fontSize: 18
},
data : [{
type: "column",
showInLegend: true,
legendMarkerType: "none",
legendText: totalEmployees,
indexLabel: "{y}",
dataPoints: dps
}]
});
// renders initial chart
chart.render();
var sum = 590; //initial sum
var updateInterval = 1000; // milliseconds
var updateChart = function () {
// Selecting a random dataPoint
var dataPointIndex = Math.round(Math.random()*4);
// generating random value
var deltaY = Math.round(2 + Math.random() *(-2-2));
// adding random value to random dataPoint
dps[dataPointIndex].y = (dps[dataPointIndex].y + deltaY) > 0 ? dps[dataPointIndex].y + deltaY : 0 ;
// updating legend text.
sum = sum + deltaY;
totalEmployees = "total people on campus: " + sum;
chart.options.data[0].legendText = totalEmployees;
chart.render();
};
// update chart after specified interval
setInterval(function(){updateChart()}, updateInterval);
}
</script>
<script type="text/javascript" src="/Users/wipro/Shiv_Suthan_M_Drive/Suthan_Drive/Apple_Dev/Projects/Swift/SwiftScript/SwiftScript/canvasjs.min.js"></script>
</head>
<body>
<div id="chartContainer" style="height:300px; width:100%;">
</div>
</body>
Viewcontroller.Swift
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let localfilePath = NSBundle.mainBundle().URLForResource("startup", withExtension: "html")
let myRequest = NSURLRequest(URL: localfilePath!);
modelWebView.loadRequest(myRequest);
/*
let url = NSURL (string: "https://www.sourcefreeze.com");
let requestObj = NSURLRequest(URL: url!);
modelWebView.loadRequest(requestObj);
*/
}
所以我想从 Swift 更新 javascript 数据点(Y 轴)。
最佳答案
更新您的 html 文件，如下所示
var dps = [
{label: "Management Wing", y: %ld},
{label: "Production Lab", y: %ld},
{label: "Cafeteria", y: %ld},
{label: "Library", y: %ld},
{label: "Recreation Centre", y: %ld}
];
现在像这样更改您的代码
let localfilePath = NSBundle.mainBundle().URLForResource("demo", withExtension: "html")
do {
var myHTMLString = try NSString(contentsOfURL: localfilePath!, encoding: NSUTF8StringEncoding)
myHTMLString = NSString(format: myHTMLString, 123, 25, 100, 46, 85) // Add 5 number that you want to change
webView.loadHTMLString(myHTMLString as String, baseURL: NSBundle.mainBundle().URLForResource("", withExtension: "")) //Add your js file here
}
catch let error as NSError
{
print("Error: \(error.description)")
}
希望这对您有帮助。
关于javascript - 从 Swift 更新 Javascript 值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37827760/