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MIUI版本6.12.8
V8.0.2.0.MXECNDG
升级稳定版之后直接闪退，照片也看不了了
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Copyright (C) 2017 MIUI
京ICP备号 | 京公网安备34号 | 京ICP证110507号iOS/oc（286）
===注意:打开相机，点击选择完照片后，会调用控制器的代理方法：-（void）viewwillAppear{}
UIImagePickerController是继承UINavigationController,所以可以push和pop一些viewcontroller进行导航效果。例如，自定义照相机画面的时候可以在拍摄完后push一个viewcontroller用于对照片进行编辑。
相机常用属性：
／／来源类型
@property(nonatomic) & & & & &UIImagePickerControllerSourceType & &
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
& & UIImagePickerControllerSourceTypePhotoLibrary,默认全部相册
& & UIImagePickerControllerSourceTypeCamera,
& & UIImagePickerControllerSourceTypeSavedPhotosAlbum
} __TVOS_PROHIBITED;
//@property
(nonatomic)NSTimeInterval
videoMaximumD@property
(nonatomic)UIImagePickerControllerQualityType
videoQtypedefNS_ENUM(NSInteger,UIImagePickerControllerQualityType)
{ UIImagePickerControllerQualityTypeHigh
= 0,UIImagePickerControllerQualityTypeMedium,UIImagePickerControllerQualityTypeLow,UIImagePickerControllerQualityType640x480,UIImagePickerControllerQualityTypeIFrame,UIImagePickerControllerQualityTypeIFrame960x540,};
(nonatomic)BOOL
showsCameraC
(nonatomic,strong)UIView
*cameraOverlayV
(nonatomic)CGAffineTransform
cameraViewT
(nonatomic)UIImagePickerControllerCameraCaptureMode
cameraCaptureM
typedefNS_ENUM(NSInteger,UIImagePickerControllerCameraCaptureMode)
{ UIImagePickerControllerCameraCaptureModePhoto,
UIImagePickerControllerCameraCaptureModeVideo};@property
(nonatomic)UIImagePickerControllerCameraDevice
cameraDtypedefNS_ENUM(NSInteger,UIImagePickerControllerCameraDevice)
{ UIImagePickerControllerCameraDeviceRear,UIImagePickerControllerCameraDeviceFront};@property
(nonatomic)UIImagePickerControllerCameraFlashMode
cameraFlashMtypedefNS_ENUM(NSInteger,UIImagePickerControllerCameraFlashMode)
{ UIImagePickerControllerCameraFlashModeOff
= -1,UIImagePickerControllerCameraFlashModeAuto
= 0,UIImagePickerControllerCameraFlashModeOn
／／最长录像时间
@property(nonatomic) & & & & &NSTimeInterval& & & & & & & & & & & & videoMaximumDurationNS_AVAILABLE_IOS(3_1);
／／showsCameraControls用于指定拍照时下方的工具栏是否显示，取而代之的是allowEditing,表示拍完照片或者从相册选完照片后，是否跳转到编辑模式对图片裁剪，只有在showsCameraControls为YES时才有效果。
@property(nonatomic)
showsCameraControls NS_AVAILABLE_IOS(3_1); ／／是否显示控制面板
@property(nonatomic)
allowsEditing NS_AVAILABLE_IOS(3_1);
//mediaTypes用于设置相机支持的功能，拍照或者是视频，返回值类型可以是:默认情况下此数组包含kUTTypeImage，表示拍照 如果要录像，必须设置为kUTTypeVideo（视频不带声音）或kUTTypeMovie（视频带声音）
@property(nonatomic,copy)
NSArray&NSString *&
//是否能获得某个资源类型，有三种：
& &&UIImagePickerControllerSourceTypePhotoLibrary,
& & UIImagePickerControllerSourceTypeCamera,
& & UIImagePickerControllerSourceTypeSavedPhotosAlbum
+ (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceT & & & & & &
& & // returns YES if source is available (i.e. camera present)
／／某种资源类型可获得的所有媒体类型的集合；集合中可以是kUTTypeImage（表示拍照）
& kUTTypeVideo（视频不带声音）或kUTTypeMovie（视频带声音）中的一种或几种；
+ (nullableNSArray&NSString
*& *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceT// returns array of available media types (i.e. kUTTypeImage)
／／是否能获得相机设备：包括前摄像头或后摄像头
+ (BOOL)isCameraDeviceAvailable:(UIImagePickerControllerCameraDevice)cameraDevice & & & & & & & & &NS_AVAILABLE_IOS(4_0);//
returns YES if camera device is available&
／／是否支持闪光灯
+ (BOOL)isFlashAvailableForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice & & & & &NS_AVAILABLE_IOS(4_0);//
returns YES if camera device supports flash and torch.
／／摄像头可获得的捕捉模式的集合
+ (nullableNSArray&NSNumber
*& *)availableCaptureModesForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDeviceNS_AVAILABLE_IOS(4_0);//
returns array of NSNumbers (UIImagePickerControllerCameraCaptureMode)
2. 常用对象方法：
- (void)takeP
(BOOL)startVideoC
- (void)stopVideoC
3. 代理方法：
(void)imagePickerController:(UIImagePickerController
*)picker didFinishPickingMediaWithInfo:(NSDictionary&NSString
(void)imagePickerControllerDidCancel:(UIImagePickerController
4. 扩展函数，用于保存到相簿：
voidUIImageWriteToSavedPhotosAlbum(
completionTarget,
SEL completionSelector,
*contextInfo);
(void)image:(UIImage
*)image didFinishSavingWithError:(NSError
*)error contextInfo:(void
*)contextI
BOOLUIVideoAtPathIsCompatibleWithSavedPhotosAlbum(NSString
*videoPath);
voidUISaveVideoAtPathToSavedPhotosAlbum(
*videoPath,
completionTarget,
SEL completionSelector,
*contextInfo);
(void)video:(NSString
*)videoPath didFinishSavingWithError:(NSError
*)error contextInfo:(void
*)contextI
********************
******************************
#pragma mark 调用系统相册及拍照功能实现的代理方法并且上传到服务器的数据库
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary&NSString
*,id& *)info
{//从相册获取图片
& & UIImage * chosenImage = info[UIImagePickerControllerEditedImage];
& & UIImageView * picImageView = (UIImageView *)[self.viewviewWithTag:500];
& & picImageView.image = chosenI
& & NSData * imageData =UIImageJPEGRepresentation(chosenImage,0.9);
//将图片上传到服务器
& & //& & --------------------------------------------------------
& & AFHTTPRequestOperationManager * manager = [[AFHTTPRequestOperationManager alloc]initWithBaseURL:nil];
& & manager.requestSerializer = [AFHTTPRequestSerializer serializer];
& & manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@&application/json&,@&text/html&,@&text/javascript&,@&text/json&,nil];
& & NSString * urlString = [NSString stringWithFormat:@&%@appuser/modifyUserIcon&,BASE_URL];
& & NSUserDefaults * userDefaults = [NSUserDefaultsstandardUserDefaults];
& & NSMutableDictionary * dict = [NSMutableDictionarydictionaryWithCapacity:1];
& & [dict setObject:[userDefaultsobjectForKey:@&user_id&]forKey:@&user_id&];／／链接服务器接口的参数
& & [manager POST:urlString parameters:dict constructingBodyWithBlock:^(id&AFMultipartFormData& formData) {
//通过post请求上传用户头像图片,name和fileName传的参数需要跟后台协商,看后台要传的参数名
& & & & [formData appendPartWithFileData:imageData name:@&img& fileName:@&img.jpg& mimeType:@&image/jpeg&];
& & } success:^(AFHTTPRequestOperation *operation, id responseObject) {
//解析后台返回的结果,如果不做一下处理,打印结果可能是一些二进制流数据
& & & & NSError *
& & & & NSDictionary * imageDict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:&error];／／从服务器得到的数据是字典
& & & & //上传成功后更新数据
& & & & self.personModel.adperurl = imageDict[@&adperurl&];／／
& & & & NSLog(@&上传图片成功0---%@&,imageDict);
& & } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
& & & & NSLog(@&上传图片--失败&
-%@&,error);
& & [picker dismissViewControllerAnimated:YEScompletion:^{
／／／／／／／／／／／／／／／UIImagePickerController实现举例一（最主要的）
#import &ViewController.h&
#import &MobileCoreServices/MobileCoreServices.h&
@interfaceViewController ()&UIImagePickerControllerDelegate,UINavigationControllerDelegate&
@property(nonatomic,strong)UIImagePickerController
@implementation ViewController
- (void)viewDidLoad {
& & [superviewDidLoad];
-(void)touchCancel{
& & & & [self.pickVCstopVideoCapture];//停止录像
& & NSLog(@&cancel&);
-(void)touchOk{
& & //& & [self.pickVC takePicture];//拍照，capturemodal设置成UIImagePickerControllerCameraCaptureModePhoto时，这个方法才起作用
& & [self.pickVCstartVideoCapture];//开始录像
& & NSLog(@&OK&);
-(void)touchesBegan:(NSSet&UITouch *& *)touches
withEvent:(UIEvent *)event{
& & //初始化UIImagePickerController
& & UIImagePickerController *PickerImage = [[UIImagePickerControlleralloc]init];
& & self.pickVC=PickerI
//& & UIImagePickerController *PickerImage = [[UIImagePickerController alloc]init];
& & //初始化提示框
& & UIAlertController *alert = [UIAlertControlleralertControllerWithTitle:nilmessage:nilpreferredStyle:UIAlertControllerStyleActionSheet];
& --------------打开相册或者视频------------- &//按钮：从相册选择，类型：UIAlertActionStyleDefault
& & [alert addAction:[UIAlertActionactionWithTitle:@&从相册选择打开图片或打开视频&style:UIAlertActionStyleDefaulthandler:^(UIAlertAction
*_Nonnull action) {
& & & & //获取方式1：通过相册（呈现全部相册，以文件夹形式展示），UIImagePickerControllerSourceTypePhotoLibrary
& & & & //获取方式2，通过相机，UIImagePickerControllerSourceTypeCamera只能拍照
& & & & //获取方法3，通过相册（呈现全部图片，打开文件夹展示文件夹里面的内容），UIImagePickerControllerSourceTypeSavedPhotosAlbum
PickerImage.sourceType =
& & & & UIImagePickerControllerSourceTypePhotoLibrary;//如果只是从相册中取图片或者视频，sourceType只能设置成UIImagePickerControllerSourceTypeSavedPhotosAlbum（展示出来的是具体图片或视频，如果只设置mediatype为视频，只有moments文件夹的内容能展示出来）或UIImagePickerControllerSourceTypePhotoLibrary（展示出来的是文件夹，有好几个文件夹moemnt，camera
roll，videos，my photo stream）
//PickerImage.mediaTypes=@[(NSString *)kUTTypeImage];//如果不设置mediaTypes，则默认是kUTTypeImage类型
//& & PickerImage.mediaTypes=@[(NSString *)kUTTypeMovie];//设置仅仅打开视频
& & & PickerImage.mediaTypes=& [UIImagePickerController&availableMediaTypesForSourceType:
UIImagePickerControllerSourceTypePhotoLibrary];//设置打开所有的媒体类型，返回一个mediaType数组
& & & & //允许编辑，即放大裁剪
& & & & PickerImage.allowsEditing =YES;
& & & & //自代理
& & & & PickerImage.delegate =self;
& & & & //页面跳转
& & & & [selfpresentViewController:PickerImageanimated:YEScompletion:nil];
& --------------------打开相机------------ &//按钮：拍照，类型：UIAlertActionStyleDefault
& & [alert addAction:[UIAlertActionactionWithTitle:@&打开相机拍照后者录像&style:UIAlertActionStyleDefaulthandler:^(UIAlertAction
*_Nonnull action){
& & & & /**
&& & & &其实和从相册选择一样，只是获取方式不同，前面是通过相册，而现在，我们要通过相机的方式
&& & & & */
& & & & //获取方式:通过相机
& & & & PickerImage.sourceType =UIImagePickerControllerSourceTypeCamera;//如果是打开相机拍照或者录像，sourceType只能设置成UIImagePickerControllerSourceTypeCamera
& & & & PickerImage.allowsEditing =YES;
& & & & PickerImage.delegate =self;
& & & &//设置所支持的类型，设置只能拍照，或则只能录像，或者两者都可以（有选择的设置）
& & & & //如果不设置mediatupes，默认情况下此数组只包含kUTTypeImage，表示拍照
& & & & //如果要录像，必须设置为kUTTypeVideo（视频不带声音）或kUTTypeMovie（视频带声音）
& & & & NSString *requiredMediaType = (NSString *)kUTTypeImage;
& & & & NSString *requiredMediaType1 = (NSString *)kUTTypeMovie;
& & & & NSArray *arrMediaTypes=[NSArray&arrayWithObjects:requiredMediaType,
requiredMediaType1,nil];
& & & & [PickerImage setMediaTypes:arrMediaTypes];//设置媒体类型
& & & & PickerImage.cameraCaptureMode=UIImagePickerControllerCameraCaptureModeVideo;//设置摄像头捕捉模式，在这里好象不设置页可以，（但是在自定义相机面时是有作用的，设置UIImagePickerControllerCameraCaptureModeVideo表示录像，UIImagePickerControllerCameraCaptureModePhoto表示拍照），但是MediaTypes必须设置
& & & & //设置录制视频的质量
& & & & [PickerImage
setVideoQuality:UIImagePickerControllerQualityTypeHigh];
& & & & //设置最长摄像时间
& & & & [PickerImage setVideoMaximumDuration:10.f];
//******************
/---------------------/自定义的相机界面，注意：自定义相机界面的设置必须是在sourcetype设置成了UIImagePickerControllerSourceTypeCamera之后，否则会报错，提示：sourceType
must be& UIImagePickerControllerSourceTypeCamera
& & & & PickerImage.showsCameraControls =NO;------------吧系统相机按钮隐藏
& & & & UIToolbar * tool = [[UIToolbar&alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height
- 40, self.view.frame.size.width,40)];
& & & & tool.barStyle =UIBarStyleBlackTranslucent;
& & & & tool.barTintColor = [UIColor&greenColor];
& & & & UIBarButtonItem * cancel = [[UIBarButtonItem&alloc]initWithTitle:@&取消&style:UIBarButtonItemStylePlain&target:self&action:@selector(touchCancel)];
& & & & cancel.width =self.view.frame.size.width/2;
& & & & UIBarButtonItem * ok = [[UIBarButtonItem&alloc]initWithTitle:@&确定&style:UIBarButtonItemStylePlain&target:self&action:@selector(touchOk)];
& & & & ok.width =self.view.frame.size.width/2;
& & & & [tool setItems:@[cancel,ok]];
& & & & //把自定义的view添加到UIImagePickerController的layView上
& & & & PickerImage.cameraOverlayView =------------替换系统的相机按钮
& & & & //****************
& & & & [self&presentViewController:PickerImage&animated:YES&completion:nil];---------------弹出相机页面
& & //-----------取消按钮-------按钮：取消，类型：UIAlertActionStyleCancel
& & [alert addAction:[UIAlertActionactionWithTitle:@&取消&style:UIAlertActionStyleCancelhandler:nil]];
& & [self&presentViewController:alert&animated:YES&completion:nil];------弹出选择按钮
／／照片视频保存到相册--------------选择完照片或视频后调用的代理方法
- (void)imagePickerController:(UIImagePickerController&*)picker didFinishPickingMediaWithInfo:(NSDictionary&NSString&*,id&
& &&if&([info[UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeImage]) {//拍照
& & & &&//获取编辑后的图片
& & & &&UIImage&*Editedimage = info[UIImagePickerControllerEditedImage];
&&//压缩图片
& & & & & & CGSize newSize=CGSizeMake(90, 90);
& & & & & & UIGraphicsBeginImageContext(newSize);
& & & & & & [Editedimage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage*newImage =UIGraphicsGetImageFromCurrentImageContext();//从图形上下文获取新的图片
& & & & & & UIGraphicsEndImageContext();
& & & &&//获得原图
& & & &&//& & & & UIImage *Originalimage = info[UIImagePickerControllerOriginalImage];
& & & &&//将照片保存到相册
& & & &// SEL是一个异步回调(参数是固定的否者会报错),不需要的话可以写nil,
& & & &UIImageWriteToSavedPhotosAlbum(Editedimage,self,@selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:),nil);
& & & &&//& & & & UIImageWriteToSavedPhotosAlbum(Editedimage, nil, nil, nil);
& & }elseif&([info[UIImagePickerControllerMediaType] isEqualToString:(NSString
*)kUTTypeMovie]){//录像
& & & &&// movie的路径
& & & &&NSURL&*url = info[UIImagePickerControllerMediaURL];
& & & &&// movie是否可以保存到相册
& & & &&BOOL&canbesaved =&UIVideoAtPathIsCompatibleWithSavedPhotosAlbum([urlpath]);
& & & &&if&(canbesaved) {
& & & & & &&//将movie保存到相册
& & & & & &UISaveVideoAtPathToSavedPhotosAlbum(url.path,self,@selector(videoSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:),nil);
&& & & & & &
& & & & }else{
& & & & & &&NSLog(@&movie can not be saved to the Camera Roll album&);
& & }else{
& & & &&NSLog(@&%@&,info[UIImagePickerControllerMediaType]);
& & [selfdismissViewControllerAnimated:YEScompletion:nil];
- (void)image:(UIImage&*)image didFinishSavingWithError:(NSError&*)error
contextInfo:(voidvoid *)contextInfo {
& &&NSLog(@&111&);
#pragma mark -&异步回调
//保存图到系统相册
- (void)imageSavedToPhotosAlbum:(UIImage&*)image didFinishSavingWithError:(NSError&*)error
contextInfo:(void *)contextInfo
& &&if&(!error) {
& & & &&NSLog(@&图片保存成功&);
& & }else{
& & & &&NSLog(@&图片保存不成功,error:%@&,error);
//保存录像到系统界面
- (void)videoSavedToPhotosAlbum:(NSString&*)videoPath didFinishSavingWithError:(NSError&*)error
contextInfo:(voidvoid *)contextInfo
& &&if&(!error) {
& & & &&NSLog(@&视频保存成功&);
& & }else{
& & & &&NSLog(@&视频保存不成功,error:%@&,error);
／／／／／／／／／／／／／／／／／／举例二++++++++++++++++++++++++++++++++
一,//自定义按钮实现打开相册
&UIActionSheetDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate&协议
- (IBAction)pickerImage:(id)sender {
& & //打开相册或相机
& & UIImagePickerController *picker = [[UIImagePickerControlleralloc]init];
& & &//设置照片源
picker.sourceType
= UIImagePickerControllerSourceTypePhotoL
&& //参数设置
& & picker.allowsEditing =YES;//允许编辑
& & //设置代理
& & picker.delegate =self;
& & //弹出控制器
& & [self.navigationController&presentViewController:pickeranimated:YEScompletion:nil];
//选中了图片的代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary&NSString
*,id& *)info
& & NSLog(@&%@&,info);
& & UIImage *image = info[UIImagePickerControllerEditedImage];//获取图片
& & NSData *imageData =UIImageJPEGRepresentation(image,0.2);//对图像做了压缩,0.2是失真度
& & //dismiss控制器
& & [self&dismissViewControllerAnimated:YES&completion:nil];
//取消图片选择控制器的代理方法
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
& & [self &&dismissViewControllerAnimated:YES&completion:nil];
============================
AVFoundation自定义拍照录像：
=======================
UIActionSheet实现打开图片:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
获取cell.tag
& & UITableViewCell *cell = [tableViewcellForRowAtIndexPath:indexPath];
& & NSInteger tag = cell.tag;
& & if (tag ==
2) {//不做任务操作
& & & & WCLog(@&不做任务操作&);
& & & & return;
& & if(tag ==
0){//选择照片
& & & & WCLog(@&选择照片&);
& & & & UIActionSheet *sheet = [[UIActionSheetalloc]initWithTitle:@&请选择&delegate:selfcancelButtonTitle:@&取消&destructiveButtonTitle:@&照相&otherButtonTitles:@&相册&,nil];
& & & & [sheet showInView:self.view];
& & }else{//跳到下一个控制器
& & & & WCLog(@&跳到下一个控制器&);
& & & & [selfperformSegueWithIdentifier:@&EditVCardSegue&sender:cell];
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
& &//获取编辑个人信息的控制
& & id destVc = segue.destinationViewController;
& & if ([destVcisKindOfClass:[WCEditProfileViewControllerclass]])
& & & & WCEditProfileViewController *editVc = destVc;
& & & & editVc.cell =
& & & & editVc.delegate =self;
#pragma mark actionsheet的代理
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
& & if(buttonIndex ==2){//取消
& & & & return;
& & UIImagePickerController *imagePicker = [[UIImagePickerControlleralloc]init];
& & imagePicker.delegate =self;
设置允许编辑
& & imagePicker.allowsEditing =YES;
& & if (buttonIndex ==0) {//照相
& & & & imagePicker.sourceType =UIImagePickerControllerSourceTypeCamera;
& & }else{//相册
& & & & imagePicker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
显示图片选择器
& & [self&presentViewController:imagePickeranimated:YES&completion:nil];
#pragma mark
图片选择器的代理
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
& & WCLog(@&%@&,info);
获取图片 设置图片
& & UIImage *image = info[UIImagePickerControllerEditedImage];
& & self.haedView.image =
& &//隐藏当前模态窗口
& & [self&dismissViewControllerAnimated:YEScompletion:nil];
更新到服务器
& & [self&editProfileViewControllerDidSave];
//选中图片后打印出来的图片信息:
=====================================
二,视频压缩（原理是：以低质量的导出）
- (void)viewDidLoad {
& & [superviewDidLoad];
& &//从相册中选择视频出来
& & UIImagePickerController *picker = [[UIImagePickerControlleralloc]init];
& &//设置素材的来源
& & self.picker.sourceType
= UIImagePickerControllerSourceTypePhotoLibrary;
& & self.picker =
&& & UIImagePickerControllerSourceTypePhotoLibrary,
&& & UIImagePickerControllerSourceTypeCamera,
&& & UIImagePickerControllerSourceTypeSavedPhotosAlbum相册
& & NSLog(@&%@&,[UIImagePickerController&availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary]);
& & self.picker.delegate =self;
& &//设置多媒体类型(设置所有类型) &图片&音频视频
& & self.picker.mediaTypes
= [UIImagePickerController&availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];//设置所有多媒体类型
//设置单个多媒体类型,
注意如果是录像必须设置，如果是拍照此步骤可以省略，因为mediaType默认包含kUTTypeImage（注意媒体类型定义在MobileCoreServices.framework中;
／／imagePickerController.mediaTypes&=&[NSArray&arrayWithObject:(NSString&*)kUTTypeMovie];
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary&NSString
*,id& *)info
//& & NSLog(@&%@&,info);
//& & UIImage *image = & info[UIImagePickerControllerOriginalImage];
//& & self.imageView.image =
& & [self.picker&dismissViewControllerAnimated:YES&completion:nil];
& & //获取视频的url
& & NSURL *url =& info[UIImagePickerControllerMediaURL];
& & //视频压缩
& &//8M& 200KB应用场景 &对像素要求不高但是需要看到视频的场景
小视频 网络传输
& &//压缩原理:&就是以低质量的导出
& & AVAsset *asset = [AVAssetasset WithURL:url];
& &//参数1是素材对象&参数2压缩的质量
& &AVAssetExportSession
*session = [[AVAssetExportSession&alloc]initWithAsset:asset
presetName:AVAssetExportPresetMediumQuality];
& & //建议 : AVAssetExportPresetHighestQuality&不压缩 AVAssetExportPresetLowQuality低质量
& & //AVAssetExportPresetMediumQuality中间
& & //路径&放在什么地方?
& & NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)lastObject]stringByAppendingPathComponent:@&hello.m4v&];
& &//删除之前存在的文件&如果没有就设么都不做
& & [[NSFileManager&defaultManager]removeItemAtPath:path&error:nil];
& & session.outputURL = [NSURL&fileURLWithPath:path];
& & //文件格式
//& & self.session =
& & NSLog(@&%@&,session.supportedFileTypes);
& & session.outputFileType =AVFileTypeQuickTimeMovie;
//& & NSLog(@&%@&,NSHomeDirectory());
& & //导出
& & [session exportAsynchronouslyWithCompletionHandler:^{
& & & & NSLog(@&导出完成!!!&);
- (void)touchesBegan:(NSSet&UITouch *& *)touches withEvent:(UIEvent *)event
& & [selfpresentViewController:self.pickeranimated:YEScompletion:nil];
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