问题描述
我使用ImagePickerController来获取个人资料图片.用户有一个按钮.该按钮触发CamRoll功能.单击该按钮时，将显示普通的ImagePickerViewController，但不会调用didFinishPickingMediaWithInfo.在早期版本的Swift/Xcode中，调用了相同的代码.这是我的代码.
I use the ImagePickerController, to grab a profile image. The user has a button. The button triggers the CamRoll function. When the button is clicked, the normal ImagePickerViewController appears, but the didFinishPickingMediaWithInfo isn't called. In an earlier version of Swift/Xcode, the same code was called. This is my code.
import UIKit
class AnnonseViewController: UIViewController, UIImagePickerControllerDelegate {
@IBOutlet var Image: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func CamRoll(_ sender: Any) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
self.present(imagePicker, animated: true, completion: nil)
}
private func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [AnyHashable: Any]) {
var image = info[UIImagePickerControllerOriginalImage] as! UIImage
let imageSize = image.size
let width = imageSize.width
let height = imageSize.height
if width != height {
let newDimensions = min(width,height)
let widthOffset = (width - newDimensions) / 2
let heightOffset = (height - newDimensions) / 2
UIGraphicsBeginImageContextWithOptions(CGSize(width: newDimensions, height: newDimensions), false, 0.0)
image.draw(at: CGPoint(x: -widthOffset, y: -heightOffset), blendMode: .copy, alpha: 1.0)
image = UIGraphicsGetImageFromCurrentImageContext()! as UIImage
UIGraphicsEndImageContext()
}
UIGraphicsBeginImageContext(CGSize(width: 150, height: 150))
_ = UIGraphicsGetCurrentContext()
image.draw(in: CGRect(x: 0, y: 0, width: 150, height: 150))
let smallImage = UIGraphicsGetImageFromCurrentImageContext()
Image.image = smallImage
picker.dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
}
为什么不调用代码?
推荐答案
在Swift 3中，对于imagePickerController(_:didFinishPickingMediaWithInfo:)的UIImagePickerControllerDelegate正确的委托方法如下.
The correct delegate method of UIImagePickerControllerDelegate in Swift 3 for imagePickerController(_:didFinishPickingMediaWithInfo:) is as follow.
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
}
您可以查看UIImagePickerControllerDelegate上的 Apple文档.
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