您好,登錄后才能下訂單哦!
這篇文章給大家分享的是有關(guān)如何使用iOS開(kāi)發(fā)自定義相機(jī)的內(nèi)容。小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,一起跟隨小編過(guò)來(lái)看看吧。
1、首先聲明以下對(duì)象
#import <AVFoundation/AVFoundation.h>//捕獲設(shè)備,通常是前置攝像頭,后置攝像頭,麥克風(fēng)(音頻輸入)@property (nonatomic, strong) AVCaptureDevice *device;//AVCaptureDeviceInput 代表輸入設(shè)備,他使用AVCaptureDevice 來(lái)初始化@property (nonatomic, strong) AVCaptureDeviceInput *input;//輸出圖片@property (nonatomic ,strong) AVCaptureStillImageOutput *imageOutput;//session:由他把輸入輸出結(jié)合在一起,并開(kāi)始啟動(dòng)捕獲設(shè)備(攝像頭)@property (nonatomic, strong) AVCaptureSession *session;//圖像預(yù)覽層,實(shí)時(shí)顯示捕獲的圖像@property (nonatomic ,strong) AVCaptureVideoPreviewLayer *previewLayer;
2、初始化各個(gè)對(duì)象
- (void)cameraDistrict{// AVCaptureDevicePositionBack 后置攝像頭// AVCaptureDevicePositionFront 前置攝像頭 self.device = [self cameraWithPosition:AVCaptureDevicePositionFront]; self.input = [[AVCaptureDeviceInput alloc] initWithDevice:self.device error:nil]; self.imageOutput = [[AVCaptureStillImageOutput alloc] init]; self.session = [[AVCaptureSession alloc] init]; // 拿到的圖像的大小可以自行設(shè)定 // AVCaptureSessionPreset320x240 // AVCaptureSessionPreset352x288 // AVCaptureSessionPreset640x480 // AVCaptureSessionPreset960x540 // AVCaptureSessionPreset1280x720 // AVCaptureSessionPreset1920x1080 // AVCaptureSessionPreset3840x2160 self.session.sessionPreset = AVCaptureSessionPreset640x480; //輸入輸出設(shè)備結(jié)合 if ([self.session canAddInput:self.input]) { [self.session addInput:self.input]; } if ([self.session canAddOutput:self.imageOutput]) { [self.session addOutput:self.imageOutput]; } //預(yù)覽層的生成 self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session]; self.previewLayer.frame = CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT-64); self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer:self.previewLayer]; //設(shè)備取景開(kāi)始 [self.session startRunning]; if ([_device lockForConfiguration:nil]) { //自動(dòng)閃光燈, if ([_device isFlashModeSupported:AVCaptureFlashModeAuto]) { [_device setFlashMode:AVCaptureFlashModeAuto]; } //自動(dòng)白平衡,但是好像一直都進(jìn)不去 if ([_device isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) { [_device setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance]; } [_device unlockForConfiguration]; }}
根據(jù)前后置位置拿到相應(yīng)的攝像頭:
- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position{ NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for ( AVCaptureDevice *device in devices ) if ( device.position == position ){ return device; } return nil;}
3、拍照拿到相應(yīng)圖片:
- (void)photoBtnDidClick{ AVCaptureConnection *conntion = [self.imageOutput connectionWithMediaType:AVMediaTypeVideo]; if (!conntion) { NSLog(@"拍照失敗!"); return; } [self.imageOutput captureStillImageAsynchronouslyFromConnection:conntion completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { if (imageDataSampleBuffer == nil) { return ; } NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; self.image = [UIImage imageWithData:imageData]; [self.session stopRunning]; [self.view addSubview:self.cameraImageView];}
4、保存照片到相冊(cè):
#pragma - 保存至相冊(cè)- (void)saveImageToPhotoAlbum:(UIImage*)savedImage{ UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);}// 指定回調(diào)方法- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo{ NSString *msg = nil ; if(error != NULL){ msg = @"保存圖片失敗" ; }else{ msg = @"保存圖片成功" ; } UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存圖片結(jié)果提示" message:msg delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil]; [alert show];}
5、前后置攝像頭的切換
- (void)changeCamera{ NSUInteger cameraCount = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count]; if (cameraCount > 1) { NSError *error; //給攝像頭的切換添加翻轉(zhuǎn)動(dòng)畫 CATransition *animation = [CATransition animation]; animation.duration = .5f; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.type = @"oglFlip"; AVCaptureDevice *newCamera = nil; AVCaptureDeviceInput *newInput = nil; //拿到另外一個(gè)攝像頭位置 AVCaptureDevicePosition position = [[_input device] position]; if (position == AVCaptureDevicePositionFront){ newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack]; animation.subtype = kCATransitionFromLeft;//動(dòng)畫翻轉(zhuǎn)方向 } else { newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront]; animation.subtype = kCATransitionFromRight;//動(dòng)畫翻轉(zhuǎn)方向 } //生成新的輸入 newInput = [AVCaptureDeviceInput deviceInputWithDevice:newCamera error:nil]; [self.previewLayer addAnimation:animation forKey:nil]; if (newInput != nil) { [self.session beginConfiguration]; [self.session removeInput:self.input]; if ([self.session canAddInput:newInput]) { [self.session addInput:newInput]; self.input = newInput; } else { [self.session addInput:self.input]; } [self.session commitConfiguration]; } else if (error) { NSLog(@"toggle carema failed, error = %@", error); } }}
6、相機(jī)的其它參數(shù)設(shè)置
//AVCaptureFlashMode 閃光燈//AVCaptureFocusMode 對(duì)焦//AVCaptureExposureMode 曝光//AVCaptureWhiteBalanceMode 白平衡//閃光燈和白平衡可以在生成相機(jī)時(shí)候設(shè)置//曝光要根據(jù)對(duì)焦點(diǎn)的光線狀況而決定,所以和對(duì)焦一塊寫//point為點(diǎn)擊的位置- (void)focusAtPoint:(CGPoint)point{ CGSize size = self.view.bounds.size; CGPoint focusPoint = CGPointMake( point.y /size.height ,1-point.x/size.width ); NSError *error; if ([self.device lockForConfiguration:&error]) { //對(duì)焦模式和對(duì)焦點(diǎn) if ([self.device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) { [self.device setFocusPointOfInterest:focusPoint]; [self.device setFocusMode:AVCaptureFocusModeAutoFocus]; } //曝光模式和曝光點(diǎn) if ([self.device isExposureModeSupported:AVCaptureExposureModeAutoExpose ]) { [self.device setExposurePointOfInterest:focusPoint]; [self.device setExposureMode:AVCaptureExposureModeAutoExpose]; } [self.device unlockForConfiguration]; //設(shè)置對(duì)焦動(dòng)畫 _focusView.center = point; _focusView.hidden = NO; [UIView animateWithDuration:0.3 animations:^{ _focusView.transform = CGAffineTransformMakeScale(1.25, 1.25); }completion:^(BOOL finished) { [UIView animateWithDuration:0.5 animations:^{ _focusView.transform = CGAffineTransformIdentity; } completion:^(BOOL finished) { _focusView.hidden = YES; }]; }]; }}
7、遇到的一些坑和解決辦法
1) 前后置攝像頭的切換
前后值不能切換,各種嘗試找了半天沒(méi)找到有原因。后來(lái)發(fā)現(xiàn)我在設(shè)置圖片尺寸的時(shí)候設(shè)置為1080P [self.session canSetSessionPreset: AVCaptureSessionPreset1920x1080] ,前置攝像頭并不支持這么大的尺寸,所以就不能切換前置攝像頭。我驗(yàn)證了下 前置攝像頭最高支持720P,720P以內(nèi)可自由切換。
當(dāng)然也可以在前后置攝像頭切換的時(shí)候,根據(jù)前后攝像頭來(lái)設(shè)置不同的尺寸,這里不在贅述。
2)焦點(diǎn)位置
CGPoint focusPoint = CGPointMake( point.y /size.height ,1-point.x/size.width );setExposurePointOfInterest:focusPoint 函數(shù)后面Point取值范圍是取景框左上角(0,0)到取景框右下角(1,1)之間。官方是這么寫的:
The value of this property is a CGPoint that determines the receiver's focus point of interest, if it has one. A value of (0,0) indicates that the camera should focus on the top left corner of the image, while a value of (1,1) indicates that it should focus on the bottom right. The default value is (0.5,0.5).
我也試了按這個(gè)來(lái)但位置就是不對(duì),只能按上面的寫法才可以。前面是點(diǎn)擊位置的y/PreviewLayer的高度,后面是1-點(diǎn)擊位置的x/PreviewLayer的寬度
3)對(duì)焦和曝光
我在設(shè)置對(duì)焦是 先設(shè)置了模式setFocusMode,后設(shè)置對(duì)焦位置,就會(huì)導(dǎo)致很奇怪的現(xiàn)象,對(duì)焦位置是你上次點(diǎn)擊的位置。所以一定要先設(shè)置位置,再設(shè)置對(duì)焦模式?! ∑毓馔?/p>
感謝各位的閱讀!關(guān)于“如何使用iOS開(kāi)發(fā)自定義相機(jī)”這篇文章就分享到這里了,希望以上內(nèi)容可以對(duì)大家有一定的幫助,讓大家可以學(xué)到更多知識(shí),如果覺(jué)得文章不錯(cuò),可以把它分享出去讓更多的人看到吧!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。