IOS多媒体开发（xcode9 Obje-C）--EMail/Camera/Video/Audio

1.首先对项目添加相关库文件：

2.头文件中添加相关引用和变量：

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>
#import <MessageUI/MessageUI.h>

@interface ViewController : UIViewController<MFMailComposeViewControllerDelegate, UIImagePickerControllerDelegate>{
    AVAudioPlayer *audioPlayer;
    AVPlayerViewController *avPlayerView;
    MFMailComposeViewController *mailView;
    UIImagePickerController *imagePicker;
    IBOutlet UIImageView *mImageView;
}

@end

3. 相机，在main.storyboard中添加一按钮启动相机，action代码如下：

- (IBAction)openCamera:(id)sender {
    imagePicker = [[UIImagePickerController alloc]init];
    if(!imagePicker) {
        NSLog(@"No camera APP in your device.");
        return;
    }
    imagePicker.allowsEditing = YES;
    imagePicker.delegate = self;
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    } else {
        imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    //[self presentModalViewController:imagePicker animated:YES];
    [self presentViewController:imagePicker animated:YES completion:nil];
}

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
    if(image == nil) {
        image = [info objectForKey:UIImagePickerControllerOriginalImage];
    }
    NSLog(@"image picker:%@", image);
    mImageView.image = image;
    [self dismissViewControllerAnimated:YES completion:nil];
}

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

4. 电子邮件，通过按钮启动：

- (IBAction)sendEmail:(id)sender {
    mailView = [[MFMailComposeViewController alloc]init];
    if(!mailView) {
        NSLog(@"No Email APP in your Device.");
        return;
    }
    mailView.mailComposeDelegate = self;
    [mailView setSubject:@"My first email"];
    [mailView setMessageBody:@"Are you feel better right now." isHTML:NO];
    //[self presentModalViewController:mailComposer animated:YES];
    [self presentViewController:mailView animated:YES completion:nil];
}

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error{
    if(result) {
        NSLog(@"Result:%ld", result);
    } else {
        NSLog(@"Error:%@", error);
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}

注意，旧版本中通过[self presentModalViewController:mailComposer animated:YES];来显示，关闭时对应为
[self dismissModalViewControllerAnimated:YES];

5. 播放音频和视频文件：

- (IBAction)playVideo:(id)sender {
    NSLog(@"Start play vedio video_test.mp4");
    NSString *path = [[NSBundle mainBundle] pathForResource:@"video_test" ofType:@"mp4"];
    AVPlayer *player = [AVPlayer playerWithURL:[NSURL fileURLWithPath:path]];
    avPlayerView = [AVPlayerViewController new];
    avPlayerView.player = player;
    [self presentViewController:avPlayerView animated:YES completion:nil];
}

- (IBAction)playAudio:(id)sender {
    NSLog(@"Start play audio audio_test.mp3");
    NSString *path = [[NSBundle mainBundle] pathForResource:@"audio_test" ofType:@"mp3"];
    audioPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:path] error:nil];
    [audioPlayer play];
    
}

示例图：