引言
UIImagePickerController確實非常強大，但是雨MPMoviePlayerController類似，由于它的高度封裝性，要進行某些自定義工作就比較復(fù)雜了。例如要做出一款類似于美顏相機的拍照界面就比較難以實現(xiàn)了，此時就可以考慮使用AVFoundation來實現(xiàn)。AVFoundation中提供了很多現(xiàn)成的播放器和錄音機，但是事實上他還有更加底層的內(nèi)容可以供開發(fā)者使用。因為AVFoundation中抽了很多和底層輸入，輸出設(shè)備打交道的類，依靠這些類開發(fā)人員面對的不再是封裝好的音頻播放器AVAudioPlayer、錄音機（AVAudioRecorder）、視頻（包括音頻）播放器AVPlayer，而是輸入設(shè)備（例如麥克風(fēng)、攝像頭）、輸出設(shè)備（圖片、視頻）等。首先了解一下使用AVFoundation做拍照和視頻錄制開發(fā)用到的相關(guān)類：
- AVCaptureSession：媒體（音、視頻）捕獲會話，負責(zé)把捕獲的音視頻數(shù)據(jù)輸出到輸出設(shè)備中。一個AVCaptureSession可以有多個輸入輸出：如圖：
AVCaptureSession可以有多個輸入輸出
- AVCaptureDevice：輸入設(shè)備，包括麥克風(fēng)、攝像頭，通過該對象可以設(shè)置物理設(shè)備的一些屬性（例如相機聚焦、白平衡等）。
- AVCaptureDeviceInput：設(shè)備輸入數(shù)據(jù)管理對象，可以根據(jù)AVCaptureDevice創(chuàng)建對應(yīng)的AVCaptureDeviceInput對象，該對象將會被添加到AVCaptureSession中管理。
- AVCaptureOutput：輸出數(shù)據(jù)管理對象，用于接收各類輸出數(shù)據(jù)，通常使用對應(yīng)的子類AVCaptureAudioDataOutput、AVCaptureStillImageOutput、AVCaptureVideoDataOutput、AVCaptureFileOutput，該對象將會被添加到AVCaptureSession中管理。注意：前面幾個對象的輸出數(shù)據(jù)都是NSData類型，而AVCaptureFileOutput代表數(shù)據(jù)以文件形式輸出，類似的，AVCcaptureFileOutput也不會直接創(chuàng)建使用，通常會使用其子類：AVCaptureAudioFileOutput、AVCaptureMovieFileOutput。當(dāng)把一個輸入或者輸出添加到AVCaptureSession之后AVCaptureSession就會在所有相符的輸入、輸出設(shè)備之間建立連接（AVCaptionConnection）：
輸入、輸出設(shè)備之間建立連接
- AVCaptureVideoPreviewLayer：相機拍攝預(yù)覽圖層，是CALayer的子類，使用該對象可以實時查看拍照或視頻錄制效果，創(chuàng)建該對象需要指定對應(yīng)的AVCaptureSession對象。
使用AVFoundation拍照和錄制視頻的一般步驟如下：
- 創(chuàng)建AVCaptureSession對象。
- 使用AVCaptureDevice的靜態(tài)方法獲得需要使用的設(shè)備，例如拍照和錄像就需要獲得攝像頭設(shè)備，錄音就要獲得麥克風(fēng)設(shè)備。
- 利用輸入設(shè)備AVCaptureDevice初始化AVCaptureDeviceInput對象。
- 初始化輸出數(shù)據(jù)管理對象，如果要拍照就初始化AVCaptureStillImageOutput對象；如果拍攝視頻就初始化AVCaptureMovieFileOutput對象。
- 將數(shù)據(jù)輸入對象AVCaptureDeviceInput、數(shù)據(jù)輸出對象AVCaptureOutput添加到媒體會話管理對象AVCaptureSession中。
- 創(chuàng)建視頻預(yù)覽圖層AVCaptureVideoPreviewLayer并指定媒體會話，添加圖層到顯示容器中，調(diào)用AVCaptureSession的startRuning方法開始捕獲。
- 將捕獲的音頻或視頻數(shù)據(jù)輸出到指定文件。
下面看一下如何使用AVFoundation實現(xiàn)一個拍照程序，在這個程序中將實現(xiàn)攝像頭預(yù)覽、切換前后攝像頭、閃光燈設(shè)置、對焦、拍照保存等功能。應(yīng)用大致效果如下：
#import "AVCostomAVViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
#define ScreenWith [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height
typedef void(^PropertyChangeBlock) (AVCaptureDevice * captureDevice);
@interface AVCostomAVViewController ()<AVCaptureFileOutputRecordingDelegate>//視頻文件輸出代理
//負責(zé)輸入和輸出設(shè)備之間的數(shù)據(jù)傳輸
@property (nonatomic, strong) AVCaptureSession * captureSession;
//負責(zé)從AVCaptureDevice獲得輸入數(shù)據(jù)
@property (nonatomic, strong) AVCaptureDeviceInput * captureDeviceInput;
//照片輸出流
@property (nonatomic, strong) AVCaptureStillImageOutput * captureStillImageOutput;
//視頻輸出流
@property (nonatomic, strong) AVCaptureMovieFileOutput * captureMovieFileOutPut;
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;//后臺任務(wù)標(biāo)識
//相機拍攝預(yù)覽圖層
@property (nonatomic, strong) AVCaptureVideoPreviewLayer * captureVideoPreviewLayer;
@property (nonatomic, strong) UIView * contentView;
//拍照按鈕
@property (nonatomic, strong) UIButton * takeButton;
//視頻錄制按鈕
@property (nonatomic, strong) UIButton * videoButton;
//自動閃光燈按鈕
@property (nonatomic, strong) UIButton * flashAutoButton;
//打開閃光燈按鈕
@property (nonatomic, strong) UIButton * flashOnButton;
//關(guān)閉閃光燈按鈕
@property (nonatomic, strong) UIButton * flashOffButton;
//切換前后攝像頭
@property (nonatomic, strong) UIButton * exchangeCamera;
//聚焦光標(biāo)
@property (nonatomic, strong) UIImageView * focusCursor;
@end
@implementation AVCostomAVViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
self.title = @"自定義拍照和視頻錄制控件";
[self setupUI];
[self initCamera];
[self.captureSession startRunning];
}
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
}
- (void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[self.captureSession stopRunning];
}
- (void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
#pragma mark - 攝像頭初始化
- (void)initCamera{
//初始化會話
_captureSession = [[AVCaptureSession alloc] init];
//設(shè)置分辨率
if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
_captureSession.sessionPreset=AVCaptureSessionPreset1280x720;
}
//獲得輸入設(shè)備
AVCaptureDevice * captureDevice = [self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];
if (!captureDevice) {
NSLog(@"取得后置攝像頭時出現(xiàn)問題。");
return;
}
NSError * error = nil;
//添加一個音頻輸入設(shè)備
AVCaptureDevice * audioCaptureDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];
AVCaptureDeviceInput * audioCaptureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioCaptureDevice error:&error];
if (error) {
NSLog(@"獲得設(shè)備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
return;
}
_captureMovieFileOutPut = [[AVCaptureMovieFileOutput alloc] init];
//根據(jù)輸入設(shè)備初始化設(shè)備輸入對象，用于獲得輸入數(shù)據(jù)
_captureDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:&error];
if (error) {
NSLog(@"取得設(shè)備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
return;
}
//初始化設(shè)備輸出對象，用于獲得輸出數(shù)據(jù)
_captureStillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary * outputSettings = @{AVVideoCodecKey:AVVideoCodecJPEG};
//輸出設(shè)置
[_captureStillImageOutput setOutputSettings:outputSettings];
//將設(shè)備輸入添加到會話中
if ([_captureSession canAddInput:_captureDeviceInput]) {
[_captureSession addInput:_captureDeviceInput];
[_captureSession addInput:audioCaptureDeviceInput];
AVCaptureConnection * captureConnection = [_captureMovieFileOutPut connectionWithMediaType:AVMediaTypeVideo];
;
if ([captureConnection isVideoStabilizationSupported]) {
captureConnection.preferredVideoStabilizationMode= AVCaptureVideoStabilizationModeAuto;
}
}
//將設(shè)輸出添加到會話中
if ([_captureSession canAddOutput:_captureStillImageOutput]) {
[_captureSession addOutput:_captureStillImageOutput];
}
if ([_captureSession canAddOutput:_captureMovieFileOutPut]) {
[_captureSession addOutput:_captureMovieFileOutPut];
}
//創(chuàng)建視頻預(yù)覽層，用于實時展示攝像頭狀態(tài)
_captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.captureSession];
CALayer * layer = self.contentView.layer;
layer.masksToBounds = YES;
_captureVideoPreviewLayer.frame = layer.bounds;
//填充模式
_captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//將視頻預(yù)覽層添加到界面中
[layer insertSublayer:_captureVideoPreviewLayer below:self.focusCursor.layer];
[self addNotificationToCaptureDevice:captureDevice];
[self addGenstureRecognizer];
[self setFlashModeButtonStatus];
}
#pragma mark - 視頻輸出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
NSLog(@"開始錄制...");
}
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
NSLog(@"視頻錄制完成.");
//視頻錄入完成之后在后臺將視頻存儲到相簿
// self.enableRotation=YES;
UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier=self.backgroundTaskIdentifier;
self.backgroundTaskIdentifier=UIBackgroundTaskInvalid;
ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init];
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) {
if (error) {
NSLog(@"保存視頻到相簿過程中發(fā)生錯誤，錯誤信息：%@",error.localizedDescription);
}
if (lastBackgroundTaskIdentifier!=UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:lastBackgroundTaskIdentifier];
}
NSLog(@"成功保存視頻到相簿.");
}];
}
#pragma mark - 攝像頭相關(guān)
// 給輸入設(shè)備添加通知
-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{
//注意添加區(qū)域改變捕獲通知必須首先設(shè)置設(shè)備允許捕獲
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
captureDevice.subjectAreaChangeMonitoringEnabled=YES;
}];
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
//捕獲區(qū)域發(fā)生改變
[notificationCenter addObserver:self selector:@selector(areaChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
-(void)removeNotificationFromCaptureDevice:(AVCaptureDevice *)captureDevice{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
[notificationCenter removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
-(void)removeNotification{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
[notificationCenter removeObserver:self];
}
-(void)addNotificationToCaptureSession:(AVCaptureSession *)captureSession{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
//會話出錯
[notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession];
}
//屏幕旋轉(zhuǎn)時調(diào)整視頻預(yù)覽圖層的方向
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection];
captureConnection.videoOrientation=(AVCaptureVideoOrientation)toInterfaceOrientation;
}
//旋轉(zhuǎn)后重新設(shè)置大小
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
_captureVideoPreviewLayer.frame=self.contentView.bounds;
}
//獲取指定位置的攝像頭
- (AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition) positon{
NSArray * cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice * camera in cameras) {
if ([camera position] == positon) {
return camera;
}
}
return nil;
}
//屬性改變操作
- (void)changeDeviceProperty:(PropertyChangeBlock ) propertyChange{
AVCaptureDevice * captureDevice = [self.captureDeviceInput device];
NSError * error;
//注意改變設(shè)備屬性前一定要首先調(diào)用lockForConfiguration:調(diào)用完之后使用unlockForConfiguration方法解鎖
if ([captureDevice lockForConfiguration:&error]) {
propertyChange(captureDevice);
[captureDevice unlockForConfiguration];
} else {
NSLog(@"設(shè)置設(shè)備屬性過程發(fā)生錯誤，錯誤信息：%@", error.localizedDescription);
}
}
//設(shè)置閃光燈模式
- (void)setFlashMode:(AVCaptureFlashMode ) flashMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFlashModeSupported:flashMode]) {
[captureDevice setFlashMode:flashMode];
}
}];
}
//聚焦模式
- (void)setFocusMode:(AVCaptureFocusMode) focusMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:focusMode];
}
}];
}
//設(shè)置曝光模式
- (void)setExposureMode:(AVCaptureExposureMode) exposureMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:exposureMode];
}
}];
}
//設(shè)置聚焦點
- (void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([captureDevice isFocusPointOfInterestSupported]) {
[captureDevice setFocusPointOfInterest:point];
}
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:AVCaptureExposureModeAutoExpose];
}
if ([captureDevice isExposurePointOfInterestSupported]) {
[captureDevice setExposurePointOfInterest:point];
}
}];
}
//添加點擊手勢，點按時聚焦
- (void)addGenstureRecognizer{
UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapScreen:)];
[self.contentView addGestureRecognizer:tapGesture];
}
//設(shè)置閃關(guān)燈按鈕狀態(tài)
- (void)setFlashModeButtonStatus{
AVCaptureDevice * captureDevice = [self.captureDeviceInput device];
AVCaptureFlashMode flashMode = captureDevice.flashMode;
if ([captureDevice isFlashAvailable]) {
self.flashAutoButton.hidden = NO;
self.flashOnButton.hidden = NO;
self.flashOffButton.hidden = NO;
self.flashAutoButton.enabled = YES;
self.flashOnButton.enabled = YES;
self.flashOffButton.enabled = YES;
switch (flashMode) {
case AVCaptureFlashModeAuto:
self.flashAutoButton.enabled = NO;
break;
case AVCaptureFlashModeOn:
self.flashOnButton.enabled = NO;
break;
case AVCaptureFlashModeOff:
self.flashOffButton.enabled = NO;
break;
default:
break;
}
} else {
self.flashAutoButton.hidden = YES;
self.flashOnButton.hidden = YES;
self.flashOffButton.hidden = YES;
}
}
//設(shè)置聚焦光標(biāo)位置
- (void)setFocusCursorWithPoint:(CGPoint)point{
self.focusCursor.center = point;
self.focusCursor.transform = CGAffineTransformMakeScale(1.5, 1.5);
self.focusCursor.alpha = 1.0;
[UIView animateWithDuration:1.0 animations:^{
self.focusCursor.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
self.focusCursor.alpha=0;
}];
}
/**
* 設(shè)備連接成功
*
* @param notification 通知對象
*/
-(void)deviceConnected:(NSNotification *)notification{
NSLog(@"設(shè)備已連接...");
}
/**
* 設(shè)備連接斷開
*
* @param notification 通知對象
*/
-(void)deviceDisconnected:(NSNotification *)notification{
NSLog(@"設(shè)備已斷開.");
}
/**
* 捕獲區(qū)域改變
*
* @param notification 通知對象
*/
-(void)areaChange:(NSNotification *)notification{
NSLog(@"捕獲區(qū)域改變...");
}
/**
* 會話出錯
*
* @param notification 通知對象
*/
-(void)sessionRuntimeError:(NSNotification *)notification{
NSLog(@"會話發(fā)生錯誤.");
}
#pragma mark - 點擊方法
- (void)tapScreen:(UITapGestureRecognizer *) tapGesture{
CGPoint point = [tapGesture locationInView:self.contentView];
//將UI坐標(biāo)轉(zhuǎn)化為攝像頭坐標(biāo)
CGPoint cameraPoint = [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point];
point.y +=124;
[self setFocusCursorWithPoint:point];
[self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
}
- (void)clickTakeButton:(UIButton *)sender{
//根據(jù)設(shè)備輸出獲得連接
AVCaptureConnection *captureConnection=[self.captureStillImageOutput connectionWithMediaType:AVMediaTypeVideo];
//根據(jù)連接取得設(shè)備輸出的數(shù)據(jù)
[self.captureStillImageOutput captureStillImageAsynchronouslyFromConnection:captureConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer) {
NSData *imageData=[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image=[UIImage imageWithData:imageData];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
}];
}
// 打開閃關(guān)燈
- (void)clickFlashOnButton:(UIButton *)sender{
[self setFlashMode:AVCaptureFlashModeOn];
[self setFlashModeButtonStatus];
}
//關(guān)閉閃光燈
- (void)clickFlashOffButton:(UIButton *)sender{
[self setFlashMode:AVCaptureFlashModeOff];
[self setFlashModeButtonStatus];
}
//自動閃關(guān)燈開起
- (void)clickFlashAutoButton:(UIButton *)sender{
[self setFlashMode:AVCaptureFlashModeAuto];
[self setFlashModeButtonStatus];
}
//切換攝像頭
- (void)clikcExchangeCamera:(UIButton *)sender{
AVCaptureDevice * currentDevice = [self.captureDeviceInput device];
AVCaptureDevicePosition currentPosition = [currentDevice position];
[self removeNotificationFromCaptureDevice:currentDevice];
AVCaptureDevice * toChangeDevice;
AVCaptureDevicePosition toChangePosition = AVCaptureDevicePositionFront;
if (currentPosition==AVCaptureDevicePositionUnspecified||currentPosition==AVCaptureDevicePositionFront) {
toChangePosition = AVCaptureDevicePositionBack;
}
toChangeDevice = [self getCameraDeviceWithPosition:toChangePosition];
[self addNotificationToCaptureDevice:toChangeDevice];
//獲得要調(diào)整到設(shè)備輸入對象
AVCaptureDeviceInput * toChangeDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];
//改變會話到配置前一定要先開啟配置，配置完成后提交配置改變
[self.captureSession beginConfiguration];
//移除原有輸入對象
[self.captureSession removeInput:self.captureDeviceInput];
//添加新的輸入對象
if ([self.captureSession canAddInput:toChangeDeviceInput]) {
[self.captureSession addInput:toChangeDeviceInput];
self.captureDeviceInput=toChangeDeviceInput;
}
//提交新的輸入對象
[self.captureSession commitConfiguration];
[self setFlashModeButtonStatus];
}
- (void)clickVideoButton:(UIButton *)sender{
//根據(jù)設(shè)備輸出獲得連接
AVCaptureConnection *captureConnection=[self.captureMovieFileOutPut connectionWithMediaType:AVMediaTypeVideo];
//根據(jù)連接取得設(shè)備輸出的數(shù)據(jù)
if (![self.captureMovieFileOutPut isRecording]) {
// self.enableRotation=NO;
//如果支持多任務(wù)則則開始多任務(wù)
if ([[UIDevice currentDevice] isMultitaskingSupported]) {
self.backgroundTaskIdentifier=[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
}
//預(yù)覽圖層和視頻方向保持一致
captureConnection.videoOrientation=[self.captureVideoPreviewLayer connection].videoOrientation;
NSString *outputFielPath=[NSTemporaryDirectory() stringByAppendingString:@"myMovie.mov"];
NSLog(@"save path is :%@",outputFielPath);
NSURL *fileUrl=[NSURL fileURLWithPath:outputFielPath];
[self.captureMovieFileOutPut startRecordingToOutputFileURL:fileUrl recordingDelegate:self];
}
else{
[self.captureMovieFileOutPut stopRecording];//停止錄制
}
}
#pragma mark - UI相關(guān)和布局
- (void)setupUI{
[self.view addSubview:self.contentView];
self.contentView.frame = CGRectMake(0, 124, ScreenWith, ScreenHeight-60-124);
self.takeButton = [self createCustomButtonWithName:@"拍照"];
[self.takeButton addTarget:self action:@selector(clickTakeButton:) forControlEvents:UIControlEventTouchUpInside];
self.takeButton.frame = CGRectMake(ScreenWith/2-30, ScreenHeight-60, 60, 60);
[self.view addSubview:self.takeButton];
self.videoButton = [self createCustomButtonWithName:@"錄像"];
[self.videoButton addTarget:self action:@selector(clickVideoButton:) forControlEvents:UIControlEventTouchUpInside];
self.videoButton.frame = CGRectMake(ScreenWith-80, ScreenHeight-60, 60, 60);
[self.view addSubview:self.videoButton];
CGFloat margin = ((ScreenWith - 4*60)/5);
self.flashOnButton = [self createCustomButtonWithName:@"打開閃光燈"];
[self.flashOnButton addTarget:self action:@selector(clickFlashOnButton:) forControlEvents:UIControlEventTouchUpInside];
self.flashOnButton.frame = CGRectMake(margin, 64, 60, 60);
[self.view addSubview:self.flashOnButton];
self.flashOffButton = [self createCustomButtonWithName:@"關(guān)閉閃光燈"];
[self.flashOffButton addTarget:self action:@selector(clickFlashOffButton:) forControlEvents:UIControlEventTouchUpInside];
self.flashOffButton.frame = CGRectMake(60+2*margin, 64, 60, 60);
[self.view addSubview:self.flashOffButton];
self.flashAutoButton = [self createCustomButtonWithName:@"自動閃光燈"];
[self.flashAutoButton addTarget:self action:@selector(clickFlashAutoButton:) forControlEvents:UIControlEventTouchUpInside];
self.flashAutoButton.frame = CGRectMake(2*60+3*margin, 64, 60, 60);
[self.view addSubview:self.flashAutoButton];
self.exchangeCamera = [self createCustomButtonWithName:@"切換"];
[self.exchangeCamera addTarget:self action:@selector(clikcExchangeCamera:) forControlEvents:UIControlEventTouchUpInside];
self.exchangeCamera.frame = CGRectMake(ScreenWith-60-margin, 64, 60, 60);
[self.view addSubview:self.exchangeCamera];
self.focusCursor = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 60, 60)];
self.focusCursor.backgroundColor = [UIColor redColor];
self.focusCursor.layer.cornerRadius = 30;
self.focusCursor.layer.masksToBounds = YES;
[self.view addSubview:self.focusCursor];
}
- (UIView *)contentView{
if (!_contentView) {
_contentView = [[UIView alloc] init];
}
return _contentView;
}
- (UIButton *)createCustomButtonWithName:(NSString *)name{
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:name forState:UIControlStateNormal];
button.backgroundColor = [UIColor redColor];
button.layer.cornerRadius = 30;
button.layer.masksToBounds = YES;
return button;
}
效果圖
