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extension Array where Element: UIImage {
func stitchImages(isVertical: Bool) -> UIImage {
let maxWidth = self.compactMap { $0.size.width }.max()
let maxHeight = self.compactMap { $0.size.height }.max()
let maxSize = CGSize(width: maxWidth ?? 0, height: maxHeight ?? 0)
let totalSize = isVertical ?
CGSize(width: maxSize.width, height: maxSize.height * (CGFloat)(self.count))
: CGSize(width: maxSize.width * (CGFloat)(self.count), height: maxSize.height)
let renderer = UIGraphicsImageRenderer(size: totalSize)
return renderer.image { (context) in
for (index, image) in self.enumerated() {
let rect = AVMakeRect(aspectRatio: image.size, insideRect: isVertical ?
CGRect(x: 0, y: maxSize.height * CGFloat(index), width: maxSize.width, height: maxSize.height) :
CGRect(x: maxSize.width * CGFloat(index), y: 0, width: maxSize.width, height: maxSize.height))
image.draw(in: rect)
}
}
}
}
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