Hello All.
I'm trying to use Core Graphics to draw to a UIView. I'm purposely avoiding
using UIKit drawing methods for UIView because I'd like to go deeper into
drawing: i have a button whose push down implementation in the View Controller
is:
let colorSpace = CGColorSpaceCreateDeviceRGB()
a = CGContext(data: nil, width: 100, height: 100, bitsPerComponent:
8, bytesPerRow: 0, space: colorSpace, bitmapInfo:
CGImageAlphaInfo.premultipliedLast.rawValue);
a?.setFillColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 0.0);
a?.fill(CGRect(x: 0, y: 0, width: 100, height: 100));
let i = a?.makeImage();
UIGraphicsPushContext(a!);
let v1 = DGView(frame: CGRect(x: 0, y: 0, width: 500, height: 550));
v1.tag = 100;
v1.image = UIImage(cgImage: i!);
self.view.addSubview(v1);
self.view.viewWithTag(100)?.backgroundColor = UIColor.white;
when i push the button, a UIView subclass (DGView) pops up with white
background. in the draw method of DGView, I added this code:
UIGraphicsPopContext();
let c = UIGraphicsGetCurrentContext();
c?.draw((c?.makeImage())!, in: CGRect(x: 0, y: 0, width: 100, height:
100));
The problem is nothing is being drawn. Output should've been a red rectangle. I
would really appreciate some guidance on this. Thanks.
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