在 UIImagePickerController 中使用警报在图像库或相机之间进行选择答案

【问题标题】：Using an alert to choose between image gallery or camera in UIImagePickerController在 UIImagePickerController 中使用警报在图像库或相机之间进行选择
【发布时间】：2017-01-18 15:20:36
【问题描述】：

我有一个 UIImagePickerController 可以工作，但我想让用户决定是拍摄图像还是从库中选择图像。所以这是我的代码尝试使用警报：

    @IBAction func cameraButton(_ sender: UIButton) {
    picker.allowsEditing = true
    let alert = UIAlertController(title: "Choose one of the following:", message: "", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "Gallery", style: .default, handler: { action in
            self.picker.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: { action in
        self.picker.sourceType = .camera
    }))
    self.present(alert, animated: true, completion: nil)
    present(picker, animated: true, completion: nil)
}

但是，一旦我单击警报中的某个操作，什么都不会发生，它只是退出警报但不显示我的选择器

感谢任何帮助

【问题讨论】：

标签： swift3 uialertview

【解决方案1】：

我通过在这样的动作中呈现来解决它：

    @IBAction func cameraButton(_ sender: UIButton) {
    picker.allowsEditing = true
    let alert = UIAlertController(title: "Choose one of the following:", message: "", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "Gallery", style: .default, handler: { action in
            self.picker.sourceType = .photoLibrary
            self.present(self.picker, animated: true, completion: nil)

    }))
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: { action in
        self.picker.sourceType = .camera
        self.present(self.picker, animated: true, completion: nil)

    }))
    self.present(alert, animated: true, completion: nil)
}

【讨论】：