一, 声明相框和按钮

    var imageView : UIImageView!
    var button : UIButton!

        imageView = UIImageView.init(frame: CGRectMake(50, 200, 300, 300))
        imageView.backgroundColor = UIColor.cyanColor()
        self.view.addSubview(imageView)
        imageView.userInteractionEnabled = true
        
        button = UIButton.init(frame: CGRectMake(50, 50, 300, 50))
        button.backgroundColor = UIColor.redColor()
        button.setTitle("选取本地图片", forState: UIControlState.Normal)
        button.addTarget(self,action:#selector(ViewController.huantu),forControlEvents:.TouchUpInside)
        self.view.addSubview(button)
    

最初.png

二, 创建提示框

extension ViewController {
        var selectorController: UIAlertController {
        let controller = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
        controller.addAction(UIAlertAction(title: "取消", style: .Cancel, handler: nil)) // 取消按钮
        controller.addAction(UIAlertAction(title: "拍照选择", style: .Default) { action in
            self.selectorSourceType(.Camera)
            }) // 拍照选择
        controller.addAction(UIAlertAction(title: "相册选择", style: .Default) { action in
            self.selectorSourceType(.PhotoLibrary)
            }) // 相册选择
        return controller
    }
    
    func huantu(){
        presentViewController(selectorController, animated: true, completion: nil)
        
    }
    
    func selectorSourceType(type: UIImagePickerControllerSourceType) {
        imagePickerController.sourceType = type
        // 打开图片选择器
        presentViewController(imagePickerController, animated: true, completion: nil)
    }
}

弹框.png

三, 扩展图片选择和结果返回

extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    // MARK: 图片选择器界面
    var imagePickerController: UIImagePickerController {
        get {
            let imagePicket = UIImagePickerController()
            imagePicket.delegate = self
            imagePicket.sourceType = .PhotoLibrary
            return imagePicket
        }
    }
    
    // MARK: 当图片选择器选择了一张图片之后回调
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: AnyObject]) {
        dismissViewControllerAnimated(true, completion: nil) // 选中图片, 关闭选择器...这里你也可以 picker.dismissViewControllerAnimated 这样调用...但是效果都是一样的...
        
        imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage // 显示图片
        imageView.contentMode = .ScaleToFill // 缩放显示, 便于查看全部的图片
    }
    
    // MARK: 当点击图片选择器中的取消按钮时回调
    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        picker.dismissViewControllerAnimated(true, completion: nil) // 效果一样的...
    }

选择本地图片.png

四, 最终效果

显示效果.png