Swift教程-视频拍摄教程

import MobileCoreServices
AssetsLibrary

修改ViewController类的声明：

class ViewController: UIViewController,UINavigationControllerDelegate,0)">UIImagePickerControllerDelegate {

ViewController类中需要实现UIImagePickerController的代理方法。实现takeVideo方法：

@IBAction func takeVideo(sender: AnyObject) {
    // 1 Check if project runs on a device with camera available
    if UIImagePickerController.isSourceTypeAvailable(.Camera) {
        // 2 Present UIImagePickerController to take video
        controller.sourceType = .Camera
        controller.mediaTypes = [kUTTypeMovie as! String]
        controller.delegate = self
        controller.videoMaximumDuration = 10.0
        presentViewController(controller,animated: true,completion: nil)
     }
     else {
        println("Camera is not available")
     }
}

1. isSourceTypeAvailable用来检测设备是否支持拍摄视频。
2. ImagePickerController的数据可以是Camera或Movie(图片和视频)两种类型。视频的maximum(拍摄视频的最长时间)长度设置为10秒。

实现viewLibrary方法：

viewLibrary(sender: AnyObject) {
    // Display Photo Library
    controller.sourceType = 
    UIImagePickerControllerSourceType.PhotoLibrary
    controller.mediaTypes = [kUTTypeMovie String]
    controller.delegate = self  
    presentViewController(controller,completion: nil)
    }

点击按钮就会打开相册。如果mediaType没有被设置为视频类型，那么视频文件就不会显示，只会显示图片资源。下面实现UIImagePickerControllerDelegate：

imagePickerController(picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [NSObject: AnyObject]) {
    // 1 
    let mediaType:AnyObject? = info[UIImagePickerControllerMediaType]

    if let type:AnyObject = mediaType {
        if type is String {
            let stringType = type String
                if stringType == kUTTypeMovie String {
                    let urlOfVideo = info[UIImagePickerControllerMediaURL] as? NSURL
                        let url = urlOfVideo {
                            // 2 
                            assetsLibrary.writeVideoAtPathToSavedPhotosAlbum(url,completionBlock: {(url: NSURL!,error: NSError!) in
                                    let theError = error{
                                        "Error saving video = (theError)")
                                    }
                                    else {
                                        "no errors happened")
                                    }
                                })
                        }
                } 
        }
    }
    // 3
    picker.dismissViewControllerAnimated(true,completion: nil)
}

imagePickerController(_:didFinishPickingMediaWithInfo:)方法告诉代理，用户选择了一段视频。info参数包含了选中的视频的URL数据

1. 字典数据类型的info的mediatype参数可用于检测参数是否是movie类型。如果是就提取视频的URL
2. writeVideoAtPathToSavedPhotosAlbum方法会把视频保存到手机相册中
3. 让ViewController视图消失

imagePickerControllerDidCancel方法：

imagePickerControllerDidCancel(picker: UIImagePickerController) {
        picker.dismissViewControllerAnimated(true,sans-serif; font-size:16px; line-height:27.2px"> 当用户点击Cancel按钮时，View Controller视图就会消失掉。如果模拟器没有视频文件，请在真实的设备上编译并运行这个项目。选择”Take Video“拍摄一段视频并选择”Use Video“，接着选择”View Library“，视频就会保存到手机相册中了。
 
 你可以在Github上下载IOS8SwiftTakeVideoPlayerTutorial的代码
                        
（编辑：李大同）
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