如何在Apple Watch上绘制自定义图形?

How can I draw custom graphics on Apple Watch?(如何在Apple Watch上绘制自定义图形?)

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问题描述

如何在Apple Watch上绘制自定义图形?

如果我理解正确的话,我们只能在Apple Watch上使用图像和标准控件。如果是,是否可以在内存中的图像上绘制自定义图形,然后将这些图像放在屏幕上?

推荐答案

WatchOS2中,您可以使用一些CoreGraphics来绘制WKInterfaceImage

作为参考,请查看AWOWwatchOS2 Sampler

绘制图片示例:

 // Create a graphics context
    let size = CGSizeMake(100, 100)
    UIGraphicsBeginImageContext(size)
    let context = UIGraphicsGetCurrentContext()

    // Setup for the path appearance
    CGContextSetStrokeColorWithColor(context, UIColor.whiteColor().CGColor)
    CGContextSetLineWidth(context, 4.0)

    // Draw lines
    CGContextBeginPath (context);
    CGContextMoveToPoint(context, 0, 0);
    CGContextAddLineToPoint(context, 100, 100);
    CGContextMoveToPoint(context, 0, 100);
    CGContextAddLineToPoint(context, 100, 0);
    CGContextStrokePath(context);

    // Convert to UIImage
    let cgimage = CGBitmapContextCreateImage(context);
    let uiimage = UIImage(CGImage: cgimage!)

    // End the graphics context
    UIGraphicsEndImageContext()

    image.setImage(uiimage)

使用Bezier路径示例:

  // Create a graphics context
    let size = CGSizeMake(100, 100)
    UIGraphicsBeginImageContext(size)
    let context = UIGraphicsGetCurrentContext()

    // Setup for the path appearance
    UIColor.greenColor().setStroke()
    UIColor.whiteColor().setFill()

    // Draw an oval
    let rect = CGRectMake(2, 2, 96, 96)
    let path = UIBezierPath(ovalInRect: rect)
    path.lineWidth = 4.0
    path.fill()
    path.stroke()

    // Convert to UIImage
    let cgimage = CGBitmapContextCreateImage(context);
    let uiimage = UIImage(CGImage: cgimage!)

    // End the graphics context
    UIGraphicsEndImageContext()

    image.setImage(uiimage)

并最终使用PocketSVG

显示SVG
  // Create a graphics context
    let size = CGSizeMake(512, 512)
    UIGraphicsBeginImageContext(size)
    let context = UIGraphicsGetCurrentContext()

    // Setup for the path appearance
    UIColor.yellowColor().setFill()

    // Convert SVG -> CGPath -> UIBezierPath
    let pocketSvg = PocketSVG(fromSVGFileNamed: "sample")
    let path = pocketSvg.bezier
    print(path)
    path.fill()

    // Convert to UIImage
    let cgimage = CGBitmapContextCreateImage(context);
    let uiimage = UIImage(CGImage: cgimage!)

    // End the graphics context
    UIGraphicsEndImageContext()

    image.setImage(uiimage)

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本文标题为:如何在Apple Watch上绘制自定义图形?

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