视频录制需要导入AVFoundation框架，视频录制的基本步骤:
<1>创建视频、音频设备
<2>指定视频、音频设备为输入设备
<3>创建视频文件输出对象
<4>创建会话对象
<5>通过会话对象关联输入和输出
<6>创建特殊的Layer,添加到self.view.layer,用来展示捕捉到的画面，可以自定义这个Layer，自定义录制界面
<7>开启会话
<8>开始录制
<9>停止录制
#import@interface ViewController ()
/**
* 视频输入设备
*/
@property (nonatomic,strong) AVCaptureDeviceInput* inputPicture;
/**
* 音频输入设备
*/
@property (nonatomic,strong) AVCaptureDeviceInput* inputAudio;
/**
* 输出
*/
@property (nonatomic,strong) AVCaptureMovieFileOutput* output;
/**
* 会话 关联输如输出
*/
@property (nonatomic,strong) AVCaptureSession* session;
/**
* 特殊的Layer,用来 展示录制的画面，可以自定义这个画面，展示自定义的录制界面
*/
@property (nonatomic,strong) AVCaptureVideoPreviewLayer* preLayer;
@property (nonatomic,strong) UIButton* recordButton;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1. 创建视频、音频设备
AVCaptureDevice* inputPicture = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDevice* inputAudio = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
//2.指定视频、音频设备为输入设备
self.inputPicture = [AVCaptureDeviceInput deviceInputWithDevice:inputPicture error:nil];
self.inputAudio = [AVCaptureDeviceInput deviceInputWithDevice:inputAudio error:nil];
//3. 创建视频文件输出
self.output = [[AVCaptureMovieFileOutput alloc] init];
//4. 创建会话，
self.session = [[AVCaptureSession alloc] init];
//5. 关联输入输出设备
if ([self.session canAddInput:self.inputAudio]) {
[self.session addInput:self.inputAudio];
}
if([self.session canAddInput:self.inputPicture]){
[self.session addInput:self.inputPicture];
}
if([self.session canAddOutput:self.output]) {
[self.session addOutput:self.output];
}
//6. 创建特殊的Layer添加到view的layer上面,展示捕捉到的画面，可以自定Layer，定制录制时的画面
self.preLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
self.preLayer.frame = self.view.bounds;
[self.view.layer addSublayer:self.preLayer];
//7. 开启会话
[self.session startRunning];
self.recordButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
self.recordButton.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2,[UIScreen mainScreen].bounds.size.height-100);
self.recordButton.titleLabel.font = [UIFont systemFontOfSize:25];
[self.recordButton setTitle:@"录 制" forState:UIControlStateNormal];
[self.recordButton setTitle:@"暂 停" forState:UIControlStateSelected];
[self.recordButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[self.view addSubview:self.recordButton];
[self.recordButton addTarget:self action:@selector(recordVideo) forControlEvents:UIControlEventTouchUpInside];
}
- (void)recordVideo{
//9. 停止录制
if ([self.output isRecording]) {
self.recordButton.selected = NO;
[self.output stopRecording];
}
else {
//8. 开始录制
self.recordButton.selected = YES;
NSString* path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"hel.mp4"];
[self.output startRecordingToOutputFileURL:[NSURL fileURLWithPath:path] recordingDelegate:self];
}
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
NSLog(@"已经录制完成");
}
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