如何检查多张图片 != nil

Question

我正在尝试使用 if 语句和 && 运算符检查是否有多个 UIImageView != nil 但问题是当用户选择 3 driverPImg.image != nil && passImg.image != nil && carImg.image != nil 下一个代码的任何照片时exited，它不会检查其余条件

这张图片显示了 3 张水平排列的图片，在 Btn 将颜色更改为红色之前，所有这些图片都应该被填充或不为零，但它应该发生的事情并没有发生

extension VC: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            
        if let editedImg = info[.editedImage] as? UIImage {
            
            SelectedImg = editedImg.withRenderingMode(.alwaysOriginal)
            
        } else if let originalImg = info[.originalImage] as? UIImage {
            SelectedImg = originalImg.withRenderingMode(.alwaysOriginal)
            
        }
        
        if let image = SelectedImg {
            if pictureSelectionType == .profilePicture {
                driverPImg.image = image
                
            }else if pictureSelectionType == .idPicture{
                passImg.image = image
                
            }else if pictureSelectionType == .vhiclePicture{
                carImg.image = image
                
            }else {
                backCarImg.image = image
                
            }

            if driverPImg.image != nil && passImg.image != nil && carImg.image != nil{
                sendApplyBtn.backgroundColor = UIColor.delevareColor
            }else {
                sendApplyBtn.backgroundColor = UIColor.lightGray
            }
            
            
        }
        dismiss(animated: true, completion: nil)
    }
        
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.dismiss(animated: true, completion: nil)
    }
    
}

Answer 1

我使用了您的代码并在 playground 上创建了一个片段。它似乎工作正常，我已经初始化了代码工作所需的变量。

var btnColor = UIColor.gray

var SelectedImg: UIImage? = UIImage.init(systemName: "house")

enum PictureSelectionType {
    case profilePicture
    case idPicture
    case vhiclePicture
}

var pictureSelectionType: PictureSelectionType? = .idPicture

var driverPImg: UIImageView! = UIImageView()
var passImg: UIImageView! = UIImageView()
var carImg: UIImageView! = UIImageView()
var backCarImg: UIImageView! = UIImageView()

func imagePickerController() {
    
//    if let editedImg = info[.editedImage] as? UIImage {
//
//        SelectedImg = editedImg.withRenderingMode(.alwaysOriginal)
//
//    } else if let originalImg = info[.originalImage] as? UIImage {
//        SelectedImg = originalImg.withRenderingMode(.alwaysOriginal)
//
//    }
    
    if let image = SelectedImg {
        if pictureSelectionType == .profilePicture {
            let image = UIImage()
            driverPImg.image = image
            
        }else if pictureSelectionType == .idPicture{
            passImg.image = image
            
        }else if pictureSelectionType == .vhiclePicture{
            carImg.image = image
            
        }else {
            backCarImg.image = image
        }
        
        if driverPImg.image != nil && passImg.image != nil && carImg.image != nil{
            btnColor = UIColor.red
            print("Red color")
        }else {
            btnColor = UIColor.lightGray
            print("Gray color")
        }
    }
}

imagePickerController()
pictureSelectionType = .profilePicture
imagePickerController()
pictureSelectionType = .vhiclePicture
imagePickerController()

确保之前选择的图像已保存且未被取消，以便条件有效。

Answer 2

您可以使用占位符进行检查，这意味着如果您的占位符图像名为“placeHolder.png”

if driverPImg.image == UIImage(named: "placeHolder.png") && passImg.image == UIImage(named: "placeHolder.png") && carImg.image == UIImage(named: "placeHolder.png") {
sendApplyBtn.backgroundColor = UIColor.lightGray

            }else {
                  sendApplyBtn.backgroundColor = UIColor.delevareColor
            }

如何检查多张图片 != nil

how to check for multiple images != nil

xcode

if-statement

uiimageview

ios

swift