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我想在用戶單擊它時着色PNG。UIImage PNG着色
我在Xcode here中找到了一個例子,但是當我在C#中嘗試時,我無法檢索圖像。
這裏是我寫的代碼:
public UIImage DrawSelectedBorder(UIImage image)
{
UIGraphics.BeginImageContextWithOptions(image.Size, false, image.CurrentScale); // for correct resolution on retina, thanks @MobileVet
CGContext context = UIGraphics.GetCurrentContext();
context.TranslateCTM(0, image.Size.Height);
context.ScaleCTM((System.nfloat)1.0, (System.nfloat)(-1.0));
CGRect rect = new CGRect(0, 0, image.Size.Width, image.Size.Height);
context.SetBlendMode(CGBlendMode.Normal);
context.SetFillColor(UIColor.Black.CGColor);
context.FillRect(rect);
// draw original image
context.SetBlendMode(CGBlendMode.Normal);
context.DrawImage(rect,image.CGImage);
// tint image (losing alpha) - the luminosity of the original image is preserved
context.SetBlendMode(CGBlendMode.Color);
context.FillRect(rect);
// mask by alpha values of original image
context.SetBlendMode(CGBlendMode.DestinationIn);
context.DrawImage(rect, image.CGImage);
UIImage coloredImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return coloredImage;
}
謝謝,我會嘗試,我看到類似'[tintColor setFill]'在原來的職位,但我想這是一個註釋。 – SunLiker67
不是這樣,原始文章不會告訴你'tintColor'是一個用顏色設置的變量。要使用它,你必須在上下文中調用SetFillColor。所以要使用'tintColor'變量,你可以像初始化它'CGColor tintColor = UIColor.Red.CGColor;',然後調用'context.SetFillColor(tintColor);' – Leze
非常感謝Leze額外的信息。 – SunLiker67