ios 相机 自定义 相片的截取
前段时间公司需要做一个身份识别的功能,而系统相机无法满足要求,so自己自定义了。
上代码:
.h文件
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h> @interface ViewController : UIViewController @property (nonatomic, strong) AVCaptureSession* session;
/**
* 输入设备
*/
@property (nonatomic, strong) AVCaptureDeviceInput* videoInput;
/**
* 照片输出流
*/
@property (nonatomic, strong) AVCaptureStillImageOutput* stillImageOutput;
/**
* 预览图层
*/
@property (nonatomic, strong) AVCaptureVideoPreviewLayer* previewLayer; /**
* 最后的缩放比例
*/
@property(nonatomic,assign)CGFloat effectiveScale;
@property (nonatomic, strong) UIView *backView;
.m文件
在这个文件你需要什么样的相机都可以在这里面设置,需要放大放小,闪光各种功能都在此处可以设置。
@interface ViewController () @end @implementation ViewController - (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:YES]; if (self.session) { [self.session startRunning];
}
} - (void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:YES]; if (self.session) { [self.session stopRunning];
}
} - (void)viewDidLoad {
self.view.backgroundColor = [UIColor blackColor]; self.backView = [[UIView alloc] initWithFrame:CGRectMake(, ,SelfWidth, SelfHeight - )];
[self.view addSubview:self.backView]; UIView *view = [[UIView alloc]initWithFrame:CGRectMake(SelfWidth/ - , SelfHeight - + , , )];
view.backgroundColor = [UIColor whiteColor];
view.layer.cornerRadius = ;
[view.layer masksToBounds];
[self.view addSubview:view]; //自己定义一个和原生的相机一样的按钮
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(SelfWidth/ - , SelfHeight - + , , );
button.backgroundColor = [UIColor whiteColor];
button.layer.cornerRadius = ;
button.layer.borderWidth = ;
button.layer.borderColor = [UIColor blackColor].CGColor;
[button.layer masksToBounds];
[button addTarget:self action:@selector(buttondown) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button]; //在相机中加个框
CALayer *Mylayer=[CALayer layer];
Mylayer.bounds=CGRectMake(, (SelfHeight - (SelfWidth - )/1.6)/, SelfWidth - , (SelfWidth - )/1.6);
Mylayer.position=CGPointMake(SelfWidth/, (SelfHeight - )/);
Mylayer.masksToBounds=YES;
Mylayer.borderWidth=;
Mylayer.borderColor=[UIColor whiteColor].CGColor;
[self.view.layer addSublayer:Mylayer]; UIButton *Lbtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
Lbtn.frame = CGRectMake(, SelfHeight - , , );
[Lbtn setTitle:@"取消" forState:UIControlStateNormal];
Lbtn.titleLabel.font = [UIFont systemFontOfSize:];
[Lbtn setTintColor:[UIColor whiteColor]];
[Lbtn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:Lbtn]; [self initAVCaptureSession]; //设置相机属性
self.effectiveScale = 1.0f;
} //设置相机属性
- (void)initAVCaptureSession{ self.session = [[AVCaptureSession alloc] init];
[self.session setSessionPreset:AVCaptureSessionPresetHigh]; NSError *error; AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //更改这个设置的时候必须先锁定设备,修改完后再解锁,否则崩溃
[device lockForConfiguration:nil];
//设置闪光灯为自动
[device setFlashMode:AVCaptureFlashModeAuto];
[device unlockForConfiguration]; self.videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:device error:&error];
AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];
if (error) {
NSLog(@"%@",error);
}
self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
//输出设置。AVVideoCodecJPEG 输出jpeg格式图片
NSDictionary * outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil];
[self.stillImageOutput setOutputSettings:outputSettings]; if ([self.session canAddInput:self.videoInput]) {
[self.session addInput:self.videoInput];
}
if ([self.session canAddOutput:captureOutput]) {
[self.session addOutput:captureOutput];
}
if ([self.session canAddOutput:self.stillImageOutput]) {
[self.session addOutput:self.stillImageOutput];
} //初始化预览图层
self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
NSLog(@"%f",SelfWidth);
self.previewLayer.frame = CGRectMake(, ,SelfWidth, SelfHeight - );
self.backView.layer.masksToBounds = YES;
[self.backView.layer addSublayer:self.previewLayer];
}
- (AVCaptureVideoOrientation)avOrientationForDeviceOrientation:(UIDeviceOrientation)deviceOrientation
{
AVCaptureVideoOrientation result = (AVCaptureVideoOrientation)deviceOrientation;
if ( deviceOrientation == UIDeviceOrientationLandscapeLeft )
result = AVCaptureVideoOrientationLandscapeRight;
else if ( deviceOrientation == UIDeviceOrientationLandscapeRight )
result = AVCaptureVideoOrientationLandscapeLeft;
return result;
} //照相按钮点击事件
-(void)buttondown{
NSLog(@"takephotoClick...");
AVCaptureConnection *stillImageConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];
UIDeviceOrientation curDeviceOrientation = [[UIDevice currentDevice] orientation];
AVCaptureVideoOrientation avcaptureOrientation = [self avOrientationForDeviceOrientation:curDeviceOrientation];
[stillImageConnection setVideoOrientation:avcaptureOrientation];
[stillImageConnection setVideoScaleAndCropFactor:self.effectiveScale]; [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:stillImageConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; [self makeImageView:jpegData];
NSLog(@"jpegDatajpegData == %ld",(unsigned long)[jpegData length]/); }];
} //拍照之后调到相片详情页面
-(void)makeImageView:(NSData*)data{ imageDetailViewController*imageView = [[imageDetailViewController alloc] init];
imageView.data = data; [self presentViewController:imageView animated:NO completion:nil]; }
//返回
-(void)back{ [self dismissViewControllerAnimated:YES completion:nil];
}
再进入详情页面进行照片的裁剪并显示
#import <UIKit/UIKit.h> @interface imageDetailViewController : UIViewController @property(nonatomic,strong)NSData *data;
@end
#import "imageDetailViewController.h" @interface imageDetailViewController ()
{
UIImage *imageIm; }
@end @implementation imageDetailViewController - (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(, -, SelfWidth, SelfHeight)];
imageView.image = [UIImage imageWithData:_data];
[self.view addSubview:imageView];
imageIm =[UIImage imageWithData:_data];
CGSize originalsize = [ imageView.image size]; NSLog(@"改变前图片的宽度为%f,图片的高度为%f",originalsize.width,originalsize.height);
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(, SelfHeight - , , );
[button setTitle:@"重拍" forState:UIControlStateNormal];
[button setTintColor:[UIColor whiteColor]];
[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button]; CALayer *Mylayer=[CALayer layer];
Mylayer.bounds=CGRectMake(, (SelfHeight - (SelfWidth - )/1.6)/, SelfWidth - , (SelfWidth - )/1.6);
Mylayer.position=CGPointMake(SelfWidth/, (SelfHeight - )/);
Mylayer.masksToBounds=YES;
Mylayer.borderWidth=;
Mylayer.borderColor=[UIColor whiteColor].CGColor;
[self.view.layer addSublayer:Mylayer]; UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
rightButton.frame = CGRectMake(SelfWidth - , SelfHeight - , , );
[rightButton setTitle:@"使用照片" forState:UIControlStateNormal];
[rightButton setTintColor:[UIColor whiteColor]];
[rightButton addTarget:self action:@selector(rightButton) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:rightButton]; // Do any additional setup after loading the view.
} -(void)rightButton{ //截取照片,截取到自定义框内的照片
imageIm = [self image:imageIm scaleToSize:CGSizeMake(SelfWidth, SelfHeight)];
//应为在展开相片时放大的两倍,截取时也要放大两倍
imageIm = [self imageFromImage:imageIm inRect:CGRectMake(*, (SelfHeight - (SelfWidth - ) /1.6)/*, (SelfWidth - )* , (SelfWidth - )/1.6*)]; //将图片存储到相册
UIImageWriteToSavedPhotosAlbum(imageIm, self, nil, nil); //截取之后将图片显示在照相时页面,和拍摄时的照片进行像素对比
UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(, (SelfHeight - (SelfWidth - ) /1.6)/ + , SelfWidth - , (SelfWidth - )/1.6)];
imageView.image = imageIm;
[self.view addSubview:imageView]; } //截取图片
-(UIImage*)image:(UIImage *)imageI scaleToSize:(CGSize)size{
/*
UIGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale)
CGSize size:指定将来创建出来的bitmap的大小
BOOL opaque:设置透明YES代表透明,NO代表不透明
CGFloat scale:代表缩放,0代表不缩放
创建出来的bitmap就对应一个UIImage对象
*/
UIGraphicsBeginImageContextWithOptions(size, NO, 2.0); //此处将画布放大两倍,这样在retina屏截取时不会影响像素 [imageI drawInRect:CGRectMake(, , size.width, size.height)]; UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return scaledImage;
}
-(UIImage *)imageFromImage:(UIImage *)imageI inRect:(CGRect)rect{ CGImageRef sourceImageRef = [imageI CGImage]; CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect); UIImage *newImage = [UIImage imageWithCGImage:newImageRef]; return newImage;
} -(void)back{
[self dismissViewControllerAnimated:NO completion:nil];
}
完整代码下载,GitHub:https://github.com/micaimanong/CameraDema
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