问题描述
我找到了相同问题的答案Objective-C@ Saving two UIImages side-by-side as one combined image? 但不适用于 Swift。
我想并排组合两个 UIImage 以创建一个 UIImage。两个图像将在边界处合并并保持原始分辨率（无屏幕截图）。
图像A + 图像B = 图像C
解决方法
您可以使用 linked question 中的想法，使用 UIGraphicsContext 和 UIImage.draw 并排绘制 2 个图像，然后从上下文。
UIImage用法（假设 extension UIImage {
func mergedSideBySide(with otherImage: UIImage) -> UIImage? {
let mergedWidth = self.size.width + otherImage.size.width
let mergedHeight = max(self.size.height,otherImage.size.height)
let mergedSize = CGSize(width: mergedWidth,height: mergedHeight)
UIGraphicsBeginImageContext(mergedSize)
self.draw(in: CGRect(x: 0,y: 0,width: mergedWidth,height: mergedHeight))
otherImage.draw(in: CGRect(x: self.size.width,height: mergedHeight))
let mergedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return mergedImage
}
}
和 leftImage 都是 rightImage）：
UIImage功能演示（使用 SwiftUI 以使用预览更快地显示）：
let mergedImage = leftImage.mergedSideBySide(with: rightImage)
struct Playground_Previews: PreviewProvider {
static let leftImage = UIColor.blue.image(CGSize(width: 128,height: 128))
static let rightImage = UIColor.red.image(CGSize(width: 128,height: 128))
static let mergedImage = leftImage.mergedSideBySide(with: rightImage) ?? UIImage()
static var previews: some View {
VStack(spacing: 10) {
Image(uiImage: leftImage)
Image(uiImage: rightImage)
Image(uiImage: mergedImage)
}
}
}
函数来自 Create UIImage with solid color in Swift。