iOS 图片裁剪 + 旋转

static func cropImage(_ image: UIImage, withRect rect: CGRect, angle: Double) -> UIImage? { // Creates a bitmap-based graphics context with rect size // and makes it the current context UIGraphicsBeginImageContext(rect.size) // Get current graphics context guard let context = UIGraphicsGetCurrentContext() else { return nil } // Move context origin to rect center context.translateBy(x: rect.width / 2, y: rect.height / 2) // Convert angle to radian and rotate context.rotate(by: CGFloat(angle / 180 * M_PI)) // Move context origin back (-rect.width / 2, -rect.height / 2) // and move opposite direction of rect origin (-rect.minX, -rect.minY) context.translateBy(x: -rect.width / 2 - rect.minX, y: -rect.height / 2 - rect.minY) // Draw image at context origin image.draw(at: .zero) // Get image let finalImage = UIGraphicsGetImageFromCurrentImageContext() // Removes the current bitmap-based graphics context from the top of the stack UIGraphicsEndImageContext() // Return image return finalImage}