iOS 自定义照相机

声明

import

import

import “DZC_TakePhoto.h”

@interface DZC_TakePhoto ()

@end

@implementation DZC_TakePhoto

-(instancetype)init

{

self=[super init];

if (self)

{

[self initialSession];

return self;

}

return self;

}

- (void)viewDidLoad {

[super viewDidLoad];

UIButton *carmerBtn=[[UIButton alloc]initWithFrame:CGRectMake(SCREENWIDTH/2-50, SCREENHEIGHT-100, 100, 50)];

// //[carmerBtn setTransform:CGAffineTransformMakeRotation(M_PI/2)];

[carmerBtn setTitle:@”拍照” forState:UIControlStateNormal];

carmerBtn.backgroundColor=[UIColor orangeColor];

[carmerBtn addTarget:self action:@selector(shutterCamera) forControlEvents:UIControlEventTouchUpInside];

self.shutterButton=carmerBtn;

[self.view addSubview:carmerBtn];

[self.view bringSubviewToFront:carmerBtn];

UIButton *returnBtn=[[UIButton alloc]initWithFrame:CGRectMake(10, SCREENHEIGHT-100, 100, 50)];

//[returnBtn setTransform:CGAffineTransformMakeRotation(M_PI/2)];

[returnBtn setTitle:@”撤销” forState:UIControlStateNormal];

returnBtn.backgroundColor=[UIColor orangeColor];

[returnBtn addTarget:self action:@selector(CloseBtn) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:returnBtn];

[self.view bringSubviewToFront:returnBtn];

// Do any additional setup after loading the view.

}

-(void)CloseBtn

{

[self dismissViewControllerAnimated:YES completion:nil];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (void) initialSession

{

//这个方法的执行我放在init方法里了

self.session = [[AVCaptureSession alloc] init];

[self.session setSessionPreset:AVCaptureSessionPresetMedium];

self.videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self backCamera] error:nil];

//[self fronCamera]方法会返回一个AVCaptureDevice对象，因为我初始化时是采用前摄像头，所以这么写，具体的实现方法后面会介绍

self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];

NSDictionary * outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil];

//这是输出流的设置参数AVVideoCodecJPEG参数表示以JPEG的图片格式输出图片

[self.stillImageOutput setOutputSettings:outputSettings];

if ([self.session canAddInput:self.videoInput]) {
[self.session addInput:self.videoInput];
}
if ([self.session canAddOutput:self.stillImageOutput]) {
[self.session addOutput:self.stillImageOutput];
}

}

- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition) position {

NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

for (AVCaptureDevice *device in devices) {

if ([device position] == position) {

_cameraAvaible=YES;

return device;

}

}

_cameraAvaible=NO;

return nil;

}

(AVCaptureDevice *)frontCamera {

return [self cameraWithPosition:AVCaptureDevicePositionFront];

}

(AVCaptureDevice *)backCamera {

return [self cameraWithPosition:AVCaptureDevicePositionBack];

}

//接下来在viewWillAppear方法里执行加载预览图层的方法

(void) setUpCameraLayer

{

if (_cameraAvaible == NO) return;

if (self.previewLayer == nil) {

self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];

self.previewLayer.videoGravity=AVLayerVideoGravityResizeAspect;

self.previewLayer.frame=CGRectMake(0,0, SCREENWIDTH, SCREENHEIGHT);

self.previewLayer.position=CGPointMake(SCREENWIDTH/2, SCREENHEIGHT/2);

[self.view.layer insertSublayer:self.previewLayer atIndex:0];

}

}

-(void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

[self setUpCameraLayer];

}

//在viewDidAppear和viewDidDisappear方法中启动和关闭session

(void) viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

if (self.session) {

[self.session startRunning];

}

}

(void) viewDidDisappear:(BOOL)animated

{

[super viewDidDisappear: animated];

if (self.session) {

[self.session stopRunning];

}

}

//这是切换镜头的按钮方法

(void)toggleCamera {

NSUInteger cameraCount = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count];

if (cameraCount > 1) {

NSError *error;

AVCaptureDeviceInput *newVideoInput;

AVCaptureDevicePosition position = [[_videoInput device] position];

if (position == AVCaptureDevicePositionBack)
newVideoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self frontCamera] error:&error];
else if (position == AVCaptureDevicePositionFront)
newVideoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self backCamera] error:&error];
else
return;

if (newVideoInput != nil) {
[self.session beginConfiguration];
[self.session removeInput:self.videoInput];
if ([self.session canAddInput:newVideoInput]) {
[self.session addInput:newVideoInput];
[self setVideoInput:newVideoInput];
} else {
[self.session addInput:self.videoInput];
}
[self.session commitConfiguration];
} else if (error) {
NSLog(@"toggle carema failed, error = %@", error);
}

}

}

// 这是拍照按钮的方法

(void) shutterCamera

{

AVCaptureConnection * videoConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];

if (!videoConnection) {

NSLog(@”take photo failed!”);

return;

}

[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {

if (imageDataSampleBuffer == NULL) {

return;

}

NSData * imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

UIImage * image = [UIImage imageWithData:imageData];

DLog(@”image size = %@”,NSStringFromCGSize(image.size));

[self.delegate PassImagedata:image];

[self dismissViewControllerAnimated:YES completion:nil];

}];

}

/*

pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

@end