ios - Combine two images

Question

I would like to take an image and duplicate it. Then increase it by 105% and overlay it on the original image.

What is the correct way to do this on iOS?

Answer 1

这是您绘制图像然后再次将其另存为图像的基本代码：

- (UIImage *)renderImage:(UIImage *)image atSize:(CGSize)size
    {
        UIGraphicsBeginImageContext(size);
        [image drawInRect:CGRectMake(0.0, 0.0, size.width, size.height)];

        // draw anything else into the context

        UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        return newImage;
    }

在它说“在上下文中绘制任何其他内容”的地方，您可以通过设置适当的矩形来绘制以缩小尺寸的图像。然后，renderImage使用您希望完整图像的任何尺寸调用该方法。您可以使用CGContextSetAlpha来设置透明度。