187实现录制视频功能

PS：对于 Video 选项，会调用摄像头和麦克风，需要真机才能测试。

UIImagePickerControllerQualityType（视频质量类型枚举）：

经过真机测试，录制30秒的视频，清晰度和大小由高到低为：

UIImagePickerControllerQualityTypeIFrame1280x720 －－ 135.6 MB

UIImagePickerControllerQualityTypeIFrame960x540 －－ 100.1 MB

UIImagePickerControllerQualityTypeHigh －－ 61.8 MB

UIImagePickerControllerQualityType640x480 －－ 12.7 MB（清晰度和大小来说，更推荐这个）

UIImagePickerControllerQualityTypeMedium －－ 2.8 MB（默认值）

UIImagePickerControllerQualityTypeLow －－ 721.4 KB（无法直视的模糊啊）

PCH File 的作用：

PCH File 在 Xcode 6中默认不会添加，这里如果我们工程文件多处地方需要调用到框架头文件时，我们可以考虑通过自行添加一个 PCH File，然后在 Build Settings 中的 Prefix Header 项设置引用此文件；这样我们就不需要在需要调用它的地方通过 import 来导入框架头文件了。

PS：Prefix Header 项设置引用此文件如果不直接用「FirstBook187/PrefixHeader.pch」的话，也可以用「$(SRCROOT)/$(PROJECT_NAME)/PrefixHeader.pch」，在这里：

$(SRCROOT) 表示工程的相对路径：/Users/Kenmu/Documents/iOSDevelopment/FirstBook187

$(PROJECT_NAME)表示工程名称：FirstBook187

实际上「$(SRCROOT)/$(PROJECT_NAME)/PrefixHeader.pch」就被自动识别为：「/Users/Kenmu/Documents/iOSDevelopment/FirstBook187/FirstBook187/PrefixHeader.pch」了

关键操作：

效果如下：

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@end

ViewController.m

#import "ViewController.h"
#import "sys/utsname.h"

@interface ViewController ()
- (void)layoutUI;
- (void)showActionSheet:(UIBarButtonItem *)sender;
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self layoutUI];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:animated];
    [self.navigationController setToolbarHidden:NO animated:animated];
}

- (void)layoutUI {
    self.navigationItem.title = @"实现录制视频功能";
    self.view.backgroundColor = [UIColor whiteColor];
    UIBarButtonItem *barBtnVideo = [[UIBarButtonItem alloc]
                                          initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
                                          target:self
                                          action:@selector(showActionSheet:)];
    self.toolbarItems = @[barBtnVideo];
}

- (void)showActionSheet:(UIBarButtonItem *)sender {
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"录制视频"
                                                             delegate:self
                                                    cancelButtonTitle:@"取消"
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:@"PhotoLibrary", @"Video", nil];
    [actionSheet showFromToolbar:self.navigationController.toolbar];
}

- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error) {
        NSLog(@"%@", [error localizedDescription]);
    }
}

#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex != actionSheet.cancelButtonIndex) {
        UIImagePickerControllerSourceType sourceType = buttonIndex;
        if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
            UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
            imagePickerController.delegate = self;
            imagePickerController.sourceType = sourceType;
            imagePickerController.videoQuality = UIImagePickerControllerQualityType640x480; //设置视频质量；默认值为UIImagePickerControllerQualityTypeMedium
            imagePickerController.videoMaximumDuration = 30; //录制视频的时间，单位为秒；默认值为10分钟＝600秒，这里设置为30秒
            
            NSArray *arrMediaType = [UIImagePickerController availableMediaTypesForSourceType:sourceType];
            if ([arrMediaType containsObject:(NSString *)kUTTypeMovie]) { //为了使用kUTTypeMovie，这里需要导入<MobileCoreServices/MobileCoreServices.h>
                imagePickerController.mediaTypes = @[(NSString *)kUTTypeMovie];
            } else {
                NSLog(@"%@ is not available.", kUTTypeMovie);
            }
            
            [self presentViewController:imagePickerController
                               animated:YES
                             completion:nil];
        }
    }
    
    /*
     UIImagePickerControllerQualityType（视频质量类型枚举）：经过真机测试，录制30秒的视频，清晰度和大小由高到低为：
     UIImagePickerControllerQualityTypeIFrame1280x720 －－ 135.6 MB
     UIImagePickerControllerQualityTypeIFrame960x540 －－ 100.1 MB
     UIImagePickerControllerQualityTypeHigh －－ 61.8 MB
     UIImagePickerControllerQualityType640x480 －－ 12.7 MB（清晰度和大小来说，更推荐这个）
     UIImagePickerControllerQualityTypeMedium －－ 2.8 MB（默认值）
     UIImagePickerControllerQualityTypeLow －－ 721.4 KB（无法直视的模糊啊）
     
     
     typedef NS_ENUM(NSInteger, UIImagePickerControllerQualityType) {
     UIImagePickerControllerQualityTypeHigh = 0,       // highest quality
     UIImagePickerControllerQualityTypeMedium = 1,     // medium quality, suitable for transmission via Wi-Fi
     UIImagePickerControllerQualityTypeLow = 2,         // lowest quality, suitable for tranmission via cellular network
     #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
     UIImagePickerControllerQualityType640x480 = 3,    // VGA quality
     #endif
     #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_5_0
     UIImagePickerControllerQualityTypeIFrame1280x720 = 4,
     UIImagePickerControllerQualityTypeIFrame960x540 = 5
     #endif
     };
     */
}

#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    //判断是否是视频
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
        NSURL *mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];
        NSString *mediaPath = [mediaURL path];
        //判断视频路径是否支持被保存到图片库中
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(mediaPath)) {
            //将视频保存到相册
            UISaveVideoAtPathToSavedPhotosAlbum(mediaPath,
                                                self,
                                                @selector(video:didFinishSavingWithError:contextInfo:),
                                                NULL);
        } else {
            NSLog(@"视频路径不支持被保存到图片库中");
        }
    }
    
    
    //把图片保存到相册
    //    UIImageWriteToSavedPhotosAlbum(imgChoice,
    //                                   self,
    //                                   @selector(image:didFinishSavingWithError:contextInfo:),
    //                                   NULL);
    
    [self imagePickerControllerDidCancel:picker];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:YES completion:nil];
}

@end

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navigationController;

@end

AppDelegate.m

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    ViewController *viewController = [[ViewController alloc] init];
    _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
    _window.rootViewController = _navigationController;
    //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无
    [_window makeKeyAndVisible];
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
}

- (void)applicationWillTerminate:(UIApplication *)application {
}

@end

PrefixHeader.pch

#ifndef FirstBook187_PrefixHeader_pch
#define FirstBook187_PrefixHeader_pch

// Include any system framework and library headers here that should be included in all compilation units.
// You will also need to set the Prefix Header build setting of one or more of your targets to reference this file.
#import <MobileCoreServices/MobileCoreServices.h>

#endif