[英]'UIImage?' is not convertible to 'UIImage' issue in swift 4
我正在嘗試實現一個圖像選擇器。 在委托方法中,我收到以下錯誤。
要么
我寫道,這是代碼
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
var image = info[.editedImage] as? UIImage
if image == nil {
image = info[.originalImage] as? UIImage
}
simpleImagePicker!.dismiss(animated: true)
}
我嘗試使用Swift 5,它沒有錯誤地工作。 但問題在於Swift 4。
怎么解決這個? 它有什么解決方案嗎?
UIImagePickerControllerDelegate
簽名對於不同的Swift版本是不同的。 您使用的是Swift 4.2及更高版本的方法,它與Swift 4.0大不相同。
Swift 4.0:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let editedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
} else if let originalimage = info[UIImagePickerControllerOriginalImage] as? UIImage {
}
}
Swift 4.2和Swift 5:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
} else if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
} else {
print("Something went wrong")
}
}
所以,檢查正確的swift版本並遵循正確的方法!
我嘗試使用Swift 5,它沒有錯誤地工作。 但問題在於Swift 4。
首先,如果你正在使用Xcode 10.x我強烈建議你執行Swift 5更新。 忘記Swift 4並保持更新。
其次,這是Swift 5上正確的UIImagePickerControllerDelegate
實現:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
// do stuff with your original image...
} else if let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
// do something with your edited image...
}
dismiss(animated: true, completion: nil)
}
無論如何,如果你想堅持使用Swift 4
,這是要使用的ImagePicker委托函數:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage {
// do stuff with your image
} else if let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage {
// do stuff with your image
}
dismiss(animated:true, completion: nil)
}
主要問題是Swift 4中沒有UIImagePickerController.InfoKey。編譯器無法定義此類型,導致錯誤如果您使用[String:Any]字典對swift 4使用正確的簽名,則錯誤將消失
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