swift2.0 UIImagePickerController 拍照 相册 录像

系统 ios9.1
语言swift2.0

在app 里最常用的功能就是多媒体选择，首先我们storyboard 创建一个button 用于触发选择事件

@IBAction func selectImageAction(sender: AnyObject) {}
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这时候通常会弹出来一个ActionSheet 上面有拍照 ， 相册，录像 和取消 这几项。iOS 8 以后actionsheet 和 alertview 都统一用UIAlertController 方法调用，8.3以前actionsheet 有独立的方法 后来都废弃了。首先我们要加入actionsheet 相关delegate 如下

class ViewController: UIViewController ,UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIActionSheetDelegate {}
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     @IBAction func selectImageAction(sender: AnyObject) {      let actionSheetController: UIAlertController = UIAlertController(title: "请选择", message:nil, preferredStyle: .ActionSheet)        //取消按钮        let cancelAction: UIAlertAction = UIAlertAction(title: "取消", style: .Cancel) { action -> Void in            //Just dismiss the action sheet        }        actionSheetController.addAction(cancelAction)        //拍照        let takePictureAction: UIAlertAction = UIAlertAction(title: "拍照", style: .Default)            { action -> Void in            [self .initWithImagePickView("拍照")]        }        actionSheetController.addAction(takePictureAction)        //相册选择        let choosePictureAction: UIAlertAction = UIAlertAction(title: "相册", style: .Default)            { action -> Void in            [self .initWithImagePickView("相册")]        }        actionSheetController.addAction(choosePictureAction)        //摄像        let moviePictureAction: UIAlertAction = UIAlertAction(title: "摄像", style: .Default)            { action -> Void in            [self .initWithImagePickView("摄像")]        }        actionSheetController.addAction(moviePictureAction)        self.presentViewController(actionSheetController, animated: true, completion: nil)    }
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这样我们想要的actionSheet 创建完成
仔细看上面的代码你会发现 [self .initWithImagePickView(“拍照”)]
这个函数，我通过这个函数选择imagePicker 不同的参数
首先创建一个 var imagePicker : UIImagePickerController! 对象
然后实现相关方法

   func initWithImagePickView(type:NSString){        self.imagePicker = UIImagePickerController()        self.imagePicker.delegate      = self;        self.imagePicker.allowsEditing = true;        switch type{        case "拍照":            self.imagePicker.sourceType = .Camera            break        case "相册":            self.imagePicker.sourceType = .PhotoLibrary            break        case "录像":            self.imagePicker.sourceType = .Camera            self.imagePicker.videoMaximumDuration = 60 * 3            self.imagePicker.videoQuality = .Type640x480            self.imagePicker.mediaTypes = [String(kUTTypeMovie)]            break        default:            print("error")        }        presentViewController(self.imagePicker, animated: true, completion: nil)    }
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swift 可以支持字符串，你也可以尝试其他类型看看！一些方法跟object c 基本一样

下面实现imagepick 的 delegate 方法就可以了
如下
对了如果要引入录制视频功能话别忘记了加
MobileCoreServices.framework 库 和 import MobileCoreServices 头文件

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

        let mediaType = info[UIImagePickerControllerMediaType] as! String        let compareResult = CFStringCompare(mediaType as NSString!, kUTTypeMovie, CFStringCompareFlags.CompareCaseInsensitive)        //判读是否是视频还是图片        if compareResult == CFComparisonResult.CompareEqualTo {            let moviePath = info[UIImagePickerControllerMediaURL] as? NSURL            //获取路径            let moviePathString = moviePath!.relativePath            if UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePathString!)            {                UISaveVideoAtPathToSavedPhotosAlbum(moviePathString!, nil, nil, nil)            }            print("视频")        }        else {            print("图片")        let image = info[UIImagePickerControllerOriginalImage] as? UIImage        self.imageView.image =  image;        }        imagePicker.dismissViewControllerAnimated(true, completion: nil)    }
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这样一个多媒体选择功能基本实现了！