在StackOverflow上有几个关于图像翻转的问题，例如这里。默认情况下，iOS在拍照时会翻转前置摄像头水平图像。我正在尝试防止仅翻转前置摄像头图像或将其翻转回正确的方向。我正在使用一个WKWebview交互。
问题在于我不知道要调用哪个方法或在我的ViewController中放置什么来获取相机并将其设置为正确方向，或者正确的设置以防止此行为。我也不知道如何获取拍摄照片的相机信息。
这是我尝试的一种解决方案，基于将一些Objective-C代码转换为在摄像头完成照片后更改图像的代码。但是，图片变量是一个常量，无法更改：
func didTakePicture(_ picture: UIImage) {
var flippedImage = UIImage(cgImage: picture.cgImage!, scale: picture.scale, orientation: .leftMirrored)
picture = flippedImage
}
任何帮助都将不胜感激。谢谢！
picture变量？你可以使用flippedImage变量，并在需要时传递它。func didTakePicture(_ picture: UIImage) {
var flippedImage = UIImage(CGImage: picture.CGImage!, scale: picture.scale, orientation: .leftMirrored)
// Here you have got flipped image you can pass it wherever you are using image
}
这些可能是一个好的起点
去除EXIF：
https://dev59.com/5Wct5IYBdhLWcg3wNq2v#34161629,
https://dev59.com/AoLba4cB1Zd3GeqPl_iB#25595495
UIImage转换：
这些可能不是完美的解决方案，但希望它们能帮助您更好地理解问题。if captureDevice.position == AVCaptureDevicePosition.back {
if let image = context.createCGImage(ciImage, from: imageRect) {
return UIImage(cgImage: image, scale: UIScreen.main.scale, orientation: .right)
}
}
if captureDevice.position == AVCaptureDevicePosition.front {
if let image = context.createCGImage(ciImage, from: imageRect) {
return UIImage(cgImage: image, scale: UIScreen.main.scale, orientation: .leftMirrored)
}
}
首先获取设备型号 检查UIDevice的设备型号扩展 link
import UIKit
public extension UIDevice {
var modelName: String {
var systemInfo = utsname()
uname(&systemInfo)
let machineMirror = Mirror(reflecting: systemInfo.machine)
let identifier = machineMirror.children.reduce("") { identifier, element in
guard let value = element.value as? Int8 where value != 0 else { return identifier }
return identifier + String(UnicodeScalar(UInt8(value)))
}
switch identifier {
case "iPod5,1": return "iPod Touch 5"
case "iPod7,1": return "iPod Touch 6"
case "iPhone3,1", "iPhone3,2", "iPhone3,3": return "iPhone 4"
case "iPhone4,1": return "iPhone 4s"
case "iPhone5,1", "iPhone5,2": return "iPhone 5"
case "iPhone5,3", "iPhone5,4": return "iPhone 5c"
case "iPhone6,1", "iPhone6,2": return "iPhone 5s"
case "iPhone7,2": return "iPhone 6"
case "iPhone7,1": return "iPhone 6 Plus"
case "iPhone8,1": return "iPhone 6s"
case "iPhone8,2": return "iPhone 6s Plus"
case "iPhone9,1", "iPhone9,3": return "iPhone 7"
case "iPhone9,2", "iPhone9,4": return "iPhone 7 Plus"
case "iPhone8,4": return "iPhone SE"
case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
case "iPad3,1", "iPad3,2", "iPad3,3": return "iPad 3"
case "iPad3,4", "iPad3,5", "iPad3,6": return "iPad 4"
case "iPad4,1", "iPad4,2", "iPad4,3": return "iPad Air"
case "iPad5,3", "iPad5,4": return "iPad Air 2"
case "iPad2,5", "iPad2,6", "iPad2,7": return "iPad Mini"
case "iPad4,4", "iPad4,5", "iPad4,6": return "iPad Mini 2"
case "iPad4,7", "iPad4,8", "iPad4,9": return "iPad Mini 3"
case "iPad5,1", "iPad5,2": return "iPad Mini 4"
case "iPad6,3", "iPad6,4", "iPad6,7", "iPad6,8":return "iPad Pro"
case "AppleTV5,3": return "Apple TV"
case "i386", "x86_64": return "Simulator"
default: return identifier
}
}
}
You call it like this:
let modelName = UIDevice.currentDevice().modelName
高度和宽度，并检查FaceTime（前置）摄像头的分辨率：
主要代码块
//Getting model Name
let modelName = UIDevice.currentDevice().modelName
//Getting the height and the width of the image captured. The apple devices either have a 7 MP,5 MP front camera or a 1.2 MP front camera.
let heightInPoints = image.size.height
let heightInPixels = heightInPoint * image.scale
let widthInPoints = image.size.width
let widthInPixels = widthInPoints * image.scale
//Checking for 7 megapixel
//3,072 x 2304 or 3180x2375 (Sorry I am not sure about the exact resolution)
if (heightInPixels == 2304 && widthInPixels== 3,072)
{
var flippedImage = UIImage(cgImage: picture.cgImage!, scale: picture.scale, orientation: .leftMirrored)
}
//Checking for 5 megapixel
//2592 x 1936 resolution
if (heightInPixels == 1944 && widthInPixels== 2592)
{
if (modelName == "iPad Mini 2" || modelName == "iPad Mini 3" || modelName == "iPad Air" || modelName == "iPad 4")
{
print ("iPad models with 5mp back camera")
}
else
{
var flippedImage = UIImage(cgImage: picture.cgImage!, scale: picture.scale, orientation: .leftMirrored)
}
}
//Checking for 1.2 MP camera
//1200 x 780 pixels 2MP resolution for iPhone 6/6+/someipad Models they have a 1.2MP camera
//No apple iDevice has a main camera below this resolution
else if (heightInPixels == 780 && widthInPixel == 1200)
{
var flippedImage = UIImage(cgImage: picture.cgImage!, scale: picture.scale, orientation: .leftMirrored)
}
我知道这个问题已经有答案了，但我认为人们可能会发现下面的链接很有用。
相机图像始终是横向的，但包含元数据方向字段，指示捕获时的设备方向。
不幸的是，一些查看器不读取此字段并旋转图像。
一个好的方法是读取此变量并相应地旋转图像。
代码来自这里 - https://github.com/nativ18/Swift-Extensions/blob/master/UIImage%2BExtensions
extension UIImage {
func alignOrientationMetadataAndSize() -> UIImage? {
let landscapeMetadata = imageOrientation == .left || imageOrientation == .leftMirrored || imageOrientation == .right || imageOrientation == .rightMirrored
let landscapeSize = size.width > size.height
switch (landscapeSize, landscapeMetadata) {
case (false, true), (true, false):
var newSize = CGSize(width: size.height, height: size.width)
// Trim off the extremely small float value to prevent core graphics from rounding it up
newSize.width = floor(newSize.width)
newSize.height = floor(newSize.height)
UIGraphicsBeginImageContextWithOptions(newSize, false, self.scale)
let context = UIGraphicsGetCurrentContext()!
context.translateBy(x: newSize.width/2, y: newSize.height/2)
self.draw(in: CGRect(x: -self.size.width/2, y: -self.size.height/2, width: self.size.width, height: self.size.height))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
default:
return self
}
}
}