在UIImage上绘制另一个图像 [英] Draw another image on a UIImage
本文介绍了在UIImage上绘制另一个图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否可以将另一个较小的图像添加到UIImage / UIImageView?如果是这样,怎么样?如果没有,那我怎么画一个小的三角形?
Is it possible to add another, smaller, image to a UIImage/UIImageView? If so, how? If not, then how can I draw a small filled triangle?
谢谢
推荐答案
您可以在 UIImageView
中添加一个子视图,其中包含另一个带有小填充三角形的图像。或者你可以在第一张图片里面画画:
You could add a subview to your UIImageView
containing another image with the small filled triangle. Or you could draw inside of the first image:
CGFloat width, height;
UIImage *inputImage; // input image to be composited over new image as example
// create a new bitmap image context at the device resolution (retina/non-retina)
UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, height), YES, 0.0);
// get context
CGContextRef context = UIGraphicsGetCurrentContext();
// push context to make it current
// (need to do this manually because we are not drawing in a UIView)
UIGraphicsPushContext(context);
// drawing code comes here- look at CGContext reference
// for available operations
// this example draws the inputImage into the context
[inputImage drawInRect:CGRectMake(0, 0, width, height)];
// pop context
UIGraphicsPopContext();
// get a UIImage from the image context- enjoy!!!
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
// clean up drawing environment
UIGraphicsEndImageContext();
此代码( source here )将创建一个新的 UIImage
,您可以使用它来初始化 UIImageView
。
This code (source here) will create a new UIImage
that you can use to initialize a UIImageView
.
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