当用户从相册中选择图像后，系统会提示他们在 UIAlertController 中输入一个值。但是， Controller 不会出现，并且屏幕变得无法点击。
这很奇怪，因为我在用户拍照时使用完全相同的代码。
当 self.getVal() 方法未被调用时，代码可以工作。它按预期工作。通过日志记录，代码中没有错误。基本上，这就像在当前 viewController View 后面创建了 AlertController。屏幕变得完全无法点击，因为它没有被关闭。 (这是我的两便士)
参见下面的代码:
@IBAction func addBarButtonPressed(sender: UIBarButtonItem) {
var alert = UIAlertController(title: "Camera or Existing Photo", message: "Take a photo with the camera, or use an existing photo on your device.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Camera", style: .Default, handler: { (action: UIAlertAction!) in
self.presentCamera()
}))
alert.addAction(UIAlertAction(title: "Photos", style: .Default, handler: { (action: UIAlertAction!) in
self.presentPhotos()
}))
presentViewController(alert, animated: true, completion: nil)
}
func presentPhotos(){
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
imagePickerController.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
imagePickerController.mediaTypes = [kUTTypeImage as String]
imagePickerController.allowsEditing = false
self.presentViewController(imagePickerController, animated: true, completion: nil)
}
}
func presentCamera() {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera){
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
imagePickerController.sourceType = UIImagePickerControllerSourceType.Camera
imagePickerController.mediaTypes = [kUTTypeImage as String]
imagePickerController.allowsEditing = false
self.presentViewController(imagePickerController, animated: true, completion: nil)
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
self.dismissViewControllerAnimated(true, completion: nil)
if (picker.sourceType == UIImagePickerControllerSourceType.Camera || picker.sourceType == UIImagePickerControllerSourceType.SavedPhotosAlbum)
{
let myImageName = NSUUID().UUIDString
let imagePath = ImageHelperService.fileInDocumentsDirectory(myImageName)
if ImageHelperService.saveImage(image, path: imagePath) {
// TODO:
// Error: This right here, when removed it runs and dismisses and updates fine, just the alertcontroller never appears so can never be dismissed
self.getVal()
while(!self.alertViewDismissed) {
NSRunLoop.currentRunLoop().runMode(NSDefaultRunLoopMode, beforeDate: NSDate(timeIntervalSinceNow: 0.1))
}
let success = DataOperationsService().SaveThingyMaBob(myImageName, value: self.alertViewValue!, bar: self.bar!)
if success {
self.tableView.reloadData()
self.doChart()
} else {
// TODO: Handle error
debugPrint("Error, save failed")
}
} else {
print("image save failed")
}
}
}
func getVal() {
self.alertViewDismissed = false
let alert = UIAlertController(title: "Enter a value", message: "val", preferredStyle: .Alert)
alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in
textField.text = ""
textField.keyboardType = .DecimalPad
})
alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action) -> Void in
print("Skip")
self.alertViewValue = nil
self.alertViewDismissed = true
}))
alert.addAction(UIAlertAction(title: "Submit", style: .Default , handler: { (action) -> Void in
let textField = alert.textFields![0] as UITextField
print("Text field: \(textField.text)")
self.alertViewValue = UtilitiesService.textFieldUnwrapToDouble(textField.text!)
self.alertViewDismissed = true
}))
self.presentViewController(alert, animated: true, completion: nil)
}
最佳答案
我通过在选择图像之前调用 UIAlertController 解决了这个问题。
这不是一个确切的解决方案，但如果您可以灵活地选择首先显示的内容，那么这更像是一种解决方法。
关于ios - 从 UIImagePickerController() 选取图像后，我尝试显示 UIAlertViewController() 但它没有出现并锁定屏幕，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36625866/