由于項目需求：在聊天中需在添加一個錄制和播放小視頻的功能宫蛆。下面主要講的使用蘋果提供的UIImagePickerController進行視頻的錄制。

第一步：需要在plist文件中添加3個權(quán)限

1、Privacy - Camera Usage Description 使用相機
2逊抡、Privacy - Microphone Usage Description 使用麥克風(fēng)
3荡含、Privacy - Photo Library Usage Description 使用相冊

第二步：導(dǎo)入靜態(tài)庫 如下圖所示

screenshot.png

第三步：代碼

1、需要導(dǎo)入的三個頭文件 并為當(dāng)前控制器添加代理UIImagePickerControllerDelegate,UINavigationControllerDelegate

#import <Photos/Photos.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import <AssetsLibrary/AssetsLibrary.h>

2甚垦、需要判斷當(dāng)前設(shè)備是否可以拍攝和擁有拍攝權(quán)限以及對拍攝的一些參數(shù)進行的設(shè)置

UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    
       //判斷是否可以拍攝
    if ( [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        //判斷是否擁有拍攝權(quán)限
        AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
            return;
        }
        
        //拍攝
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        
        //錄制的類型 下面為視頻
        imagePicker.mediaTypes=@[(NSString*)kUTTypeMovie];
        
        //錄制的時長
        imagePicker.videoMaximumDuration=10.0;
        
        //模態(tài)視圖的彈出效果
        imagePicker.modalPresentationStyle=UIModalPresentationOverFullScreen;
        [self presentViewController:imagePicker animated:YES completion:nil];
    }

3茶鹃、視頻錄制完成進入代理方法創(chuàng)建路徑獲得視頻

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
    
    //返回的媒體類型是照片或者視頻
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        //照片的處理
        [picker dismissViewControllerAnimated:YES completion:^{
            UIImage *img = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        }];
        
    }else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]){
        
        //視頻的處理
        [picker dismissViewControllerAnimated:YES completion:^() {
            
            //文件管理器
            NSFileManager* fm = [NSFileManager defaultManager];
            
            //創(chuàng)建視頻的存放路徑
            NSString * path = [NSString stringWithFormat:@"%@/tmp/video%.0f.merge.mp4", NSHomeDirectory(), [NSDate timeIntervalSinceReferenceDate] * 1000];
            NSURL *mergeFileURL = [NSURL fileURLWithPath:path];
            videoUrl = mergeFileURL;
            
            //通過文件管理器將視頻存放的創(chuàng)建的路徑中
            [fm copyItemAtURL:[info objectForKey:UIImagePickerControllerMediaURL] toURL:mergeFileURL error:nil];
            AVURLAsset * asset = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:path]];
            
            //根據(jù)AVURLAsset得出視頻的時長
            CMTime   time = [asset duration];
            int seconds = ceil(time.value/time.timescale);
            NSString *videoTime = [NSString stringWithFormat:@"%d",seconds];
  
            //可以根據(jù)需求判斷是否需要將錄制的視頻保存到系統(tǒng)相冊中
//            ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
//            NSURL *recordedVideoURL= [info objectForKey:UIImagePickerControllerMediaURL];
//            
//            if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:recordedVideoURL]) {
//                [library writeVideoAtPathToSavedPhotosAlbum:recordedVideoURL
//                                            completionBlock:^(NSURL *assetURL, NSError *error){
//                                                
//                                            }];
//            }
            
            }];
    }
}