如何合并两个UIImages？ [英] How to merge two UIImages?

问题描述

我正在尝试合并两个不同的图像并创建一个新图像。这是我想要的方式：
我有这个图像（A）：

I am trying to merge two different images and create a new one. This is the way I would like to do: I have this image (A):

这是一张PNG图片，我想合并这个与另一个图像（B），我从手机上创建这样的东西：

It's a PNG image and I would like to merge this one with another image (B) which I took from the phone to create something like this:

我需要合并A的功能B创建C.尺寸必须保留在A图像中，图像B应自动调整尺寸以适应宝丽来（A）。有可能吗？感谢您的帮助！

I need a function who merge A with B creating C. The size must remain from the A image and the image B should auto adapt the size to fit into the polaroid (A). Is it possible to do that? Thank for your help!

更新
只需一件事，图像（A）是一个正方形，我拍摄的图像是一个16：9，我怎么能解决这个问题？如果我使用你的功能，我拍摄的图像（B）会变得拉长！

UPDATE Just one thing, the image (A) is a square and the image i took is a 16:9, how can i fix that?? If i use your function the image (B) that i took become stretched!

推荐答案

希望这可以帮到你，

var bottomImage = UIImage(named: "bottom.png")
var topImage = UIImage(named: "top.png")

var size = CGSize(width: 300, height: 300)
UIGraphicsBeginImageContext(size)

let areaSize = CGRect(x: 0, y: 0, width: size.width, height: size.height)
bottomImage!.draw(in: areaSize)

topImage!.draw(in: areaSize, blendMode: .normal, alpha: 0.8)

var newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()

所有最佳：）

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