我想将多个图像水平拼接在一起并将其另存为一个图像。在这个问题下,我找到了这个建议的解决方案:
import UIKit
import AVFoundation
func stitchImages(images: [UIImage], isVertical: Bool) -> UIImage {
var stitchedImages : UIImage!
if images.count > 0 {
var maxWidth = CGFloat(0), maxHeight = CGFloat(0)
for image in images {
if image.size.width > maxWidth {
maxWidth = image.size.width
}
if image.size.height > maxHeight {
maxHeight = image.size.height
}
}
var totalSize : CGSize
let maxSize = CGSize(width: maxWidth, height: maxHeight)
if isVertical {
totalSize = CGSize(width: maxSize.width, height: maxSize.height * (CGFloat)(images.count))
} else {
totalSize = CGSize(width: maxSize.width * (CGFloat)(images.count), height: maxSize.height)
}
UIGraphicsBeginImageContext(totalSize)
for image in images {
let offset = (CGFloat)(images.index(of: image)!)
let rect = AVMakeRect(aspectRatio: image.size, insideRect: isVertical ?
CGRect(x: 0, y: maxSize.height * offset, width: maxSize.width, height: maxSize.height) :
CGRect(x: maxSize.width * offset, y: 0, width: maxSize.width, height: maxSize.height))
image.draw(in: rect)
}
stitchedImages = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
return stitchedImages
}
但是,我不知道如何使用它。有人可以举例说明如何将其与图像数组一起使用吗?
谢谢!
一点更新斯威夫特 4
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)
}
}
}
}
真的吗?
您找到的代码正是您要查找的代码,但您不知道如何调用它?
如果你不知道如何调用一个函数,那么以一种有用的方式帮助你有点困难。下面是一些通用代码,可以加载图像数组并将它们拼接在一起:
//Create an array of image names
let imageNames = ["Fish", "Dog", "Eggplant", "Wombat"]
//create an array of images with those names (images must exist in app bundle)
let images = imageNames.flatMap{UIImage(named:$0)}
//Stitch the images together horizontally
let stichedImage = stitchImages(images: images, isVertical: false)
你可能应该停下来阅读一些关于 Swift 的内容。我建议下载Apple Swift的书并阅读它。它非常好,而且很容易遵循。我就是这样学习这门语言的。