引言
I 常用基础功能
1.1模拟拍照动作
//振动，颤动，摆动
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);// // 播放一下“拍照”的声音，模拟拍照 AudioServicesPlaySystemSound(1108);
1.2 能否切换前置后置
//
- (BOOL)canSwitchCameras {
return [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count] > 1;
}
1.3 从输出的元数据中捕捉人脸
实现输出流的代理AVCaptureMetadataOutputObjectsDelegate
_metadataOutput = [[AVCaptureMetadataOutput alloc]init];
[_metadataOutput setMetadataObjectsDelegate:self queue:self.queue];
[self.videoDataOutput setSampleBufferDelegate:nil queue:self.queue];
// 检测人脸是为了获得“人脸区域”，做“人脸区域”与“身份证人像框”的区域对比，当前者在后者范围内的时候，才能截取到完整的身份证图像
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
if (metadataObjects.count) {
AVMetadataMachineReadableCodeObject *metadataObject = metadataObjects.firstObject;
AVMetadataObject *transformedMetadataObject = [self.previewLayer transformedMetadataObjectForMetadataObject:metadataObject];
CGRect faceRegion = transformedMetadataObject.bounds;
if (metadataObject.type == AVMetadataObjectTypeFace) {
NSLog(@"是否包含头像：%d, facePathRect: %@, faceRegion: %@",CGRectContainsRect(self.faceDetectionFrame, faceRegion),NSStringFromCGRect(self.faceDetectionFrame),NSStringFromCGRect(faceRegion));
if (CGRectContainsRect(self.faceDetectionFrame, faceRegion)) {// 只有当人脸区域的确在小框内时，才再去做捕获此时的这一帧图像
// 为videoDataOutput设置代理，程序就会自动调用下面的代理方法，捕获每一帧图像
if (!self.videoDataOutput.sampleBufferDelegate) {
[self.videoDataOutput setSampleBufferDelegate:self queue:self.queue];
}
}
}
}
}
1.4 捕获每一帧图像： AVCaptureVideoDataOutputSampleBufferDelegate
甚至代理
_videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
[self.videoDataOutput setSampleBufferDelegate:self queue:self.queue];从输出的数据流捕捉单一的图像帧
#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate
#pragma mark 从输出的数据流捕捉单一的图像帧
// AVCaptureVideoDataOutput获取实时图像，这个代理方法的回调频率很快，几乎与手机屏幕的刷新频率一样快
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
if ([self.outPutSetting isEqualToNumber:[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange]] || [self.outPutSetting isEqualToNumber:[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarFullRange]]) {
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
if ([captureOutput isEqual:self.videoDataOutput]) {
// 身份证信息识别 +(void)iDCardRecognit:(CVImageBufferRef)imageBuffer WithstopRunningBlcok:(void(^)(id make)) stopRunningBlcok finishBlock:(k_finishBlock)finishBlock;
__weak __typeof__(self) weakSelf = self;
[KNScanCardManage iDCardRecognit:imageBuffer WithstopRunningBlcok:^(id _Nonnull sender) {
if ([weakSelf.session isRunning]) {
[weakSelf.session stopRunning];
}
} finishBlock:weakSelf.finishBlock];//imageBuffer
// 身份证信息识别完毕后，就将videoDataOutput的代理去掉，防止频繁调用AVCaptureVideoDataOutputSampleBufferDelegate方法而引起的“混乱”
if (self.videoDataOutput.sampleBufferDelegate) {
[self.videoDataOutput setSampleBufferDelegate:nil queue:self.queue];
}
}
} else {
NSLog(@"输出格式不支持");
}
}
1.5 点击屏幕对焦：聚焦
监听点击事件
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(focusGesture:)];
[self.view addGestureRecognizer:tapGesture];
点击屏幕对焦
#pragma mark - 点击屏幕对焦：聚焦
- (void)focusGesture:(UITapGestureRecognizer*)gesture{
CGPoint point = [gesture locationInView:gesture.view];
[self focusAtPoint:point];
}
- (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]) {
if ([self.device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
[self.device setFocusPointOfInterest:focusPoint];
[self.device setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([self.device isExposureModeSupported:AVCaptureExposureModeAutoExpose ]) {
[self.device setExposurePointOfInterest:focusPoint];
[self.device setExposureMode:AVCaptureExposureModeAutoExpose];
}
[self.device unlockForConfiguration];
self.focusView.center = point;
_focusView.hidden = NO;
// self.focusView.alpha = 1;
[UIView animateWithDuration:0.2 animations:^{
self.focusView.transform = CGAffineTransformMakeScale(1.25f, 1.25f);
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3 animations:^{
self.focusView.transform = CGAffineTransformMakeScale(1.0f, 1.0f);
} completion:^(BOOL finished) {
[self hiddenFocusAnimation];
}];
}];
}
}
- (void)hiddenFocusAnimation{
[UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()];
[UIView setAnimationDelay:3];
self.focusView.alpha = 0;
[UIView setAnimationDuration:0.5f];//动画时间
[UIView commitAnimations];
}
- (void)hiddenFoucsView{
self.focusView.alpha = !self.focusView.alpha;
}
- (void)focusDidFinsh{
self.focusView.hidden = YES;
self.focusView.transform = CGAffineTransformMakeScale(1.0f, 1.0f);
}
- (void)startFocusAnimation{
self.focusView.hidden = NO;
self.focusView.transform = CGAffineTransformMakeScale(1.25f, 1.25f);//将要显示的view按照正常比例显示出来
[UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()];
[UIView setAnimationDidStopSelector:@selector(hiddenFocusAnimation)];
[UIView setAnimationDuration:0.5f];//动画时间
self.focusView.transform = CGAffineTransformIdentity;//先让要显示的view最小直至消失
[UIView commitAnimations]; //启动动画
//相反如果想要从小到大的显示效果，则将比例调换
}
初始化对焦区域
#pragma mark - 初始化对焦区域
-(UIImageView *)focusView{
if (_focusView == nil) {
_focusView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 80, 80)];
_focusView.backgroundColor = [UIColor clearColor];
// _focusView.image = [UIImage imageNamed:@"foucs80pt"];
_focusView.hidden = YES;
[self.view addSubview:self.focusView];
}
return _focusView;
}
新增【触摸屏幕对焦】提示语
//
- (UILabel *)tip4focusLabel {
if (_tip4focusLabel == nil) {
UILabel *tmp =[UILabel new];
_tip4focusLabel =tmp;
tmp.textColor = [UIColor whiteColor];
tmp.numberOfLines = 0;
tmp.textAlignment = NSTextAlignmentCenter;
tmp.font = kPingFangFont(16);
NSMutableAttributedString *xx = [[NSMutableAttributedString alloc]init];
xx.kn_addString(@" 触摸屏幕对焦").kn_fontColor(rgb(255,255,255)).kn_addString(@"").kn_fontColor(rgb(225,66,66)).kn_addString(@"").kn_fontColor(rgb(255,255,255));
tmp.attributedText = xx;
tmp.transform = CGAffineTransformMakeRotation(M_PI/2);
[self.view addSubview:tmp];
__weak __typeof__(self) weakSelf = self;
[tmp mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerX.equalTo(weakSelf.view.mas_left).offset(kAdjustRatio( 23));
make.centerY.offset(kAdjustRatio(0));
}];
}
return _tip4focusLabel;
}
1.6 身份证和人头像的宽高比
身份证的宽高比
CGFloat width = iPhone5or5cor5sorSE? 240: (iPhone6or6sor7? 270: 300);
_IDCardScanningWindowLayer.bounds = (CGRect){CGPointZero, {width, width * 1.574}};
人头像的宽高比
CGFloat facePathWidth = iPhone5or5cor5sorSE? 125: (iPhone6or6sor7? 150: 180);
CGFloat facePathHeight = facePathWidth * 0.812;
1.7 调整屏幕亮度
常用场景我们可以在打开某个特定界面的时候调整亮度，退出时恢复亮度！
类似支付宝微信的二维码提供扫描时会使屏幕高亮状态
//获取当前屏幕的亮度
CGFloat value = [UIScreen mainScreen].brightness;
//设置屏幕亮度
//设置窗口亮度大小 范围是0.1 -1.0
[[UIScreen mainScreen] setBrightness:0.5];
//设置屏幕常亮
//设置屏幕常亮
[UIApplication sharedApplication].idleTimerDisabled = YES;
//恢复屏幕默认
[UIApplication sharedApplication].idleTimerDisabled = NO;
1.8 获取iPhone设备摄像头所感知的环境光强度
值越大，光强度效果越明显
使用场景： 自定义相机进行OCR的时候，检测到光强度暗的时候，提示打开闪光灯(或者光线暗的时候，能够自动打开闪光灯)
#import <ImageIO/ImageIO.h>
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
CFDictionaryRef metadataDict = CMCopyDictionaryOfAttachments(NULL,sampleBuffer, kCMAttachmentMode_ShouldPropagate);
NSDictionary *metadata = [[NSMutableDictionary alloc] initWithDictionary:(__bridge NSDictionary*)metadataDict];
CFRelease(metadataDict);
NSDictionary *exifMetadata = [[metadata objectForKey:(NSString *)kCGImagePropertyExifDictionary] mutableCopy];
float brightnessValue = [[exifMetadata objectForKey:(NSString *)kCGImagePropertyExifBrightnessValue] floatValue];
NSLog(@"%f",brightnessValue);
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCodeScanManager:brightnessValue:)]) {
[self.delegate QRCodeScanManager:self brightnessValue:brightnessValue];
}
}根据光线强弱值打开手电筒的方法
/** 根据光线强弱值打开手电筒的方法 (brightnessValue: 光线强弱值) */
- (void)QRCodeScanManager:(SGQRCodeScanManager *)scanManager brightnessValue:(CGFloat)brightnessValue;
光线明亮，隐藏闪光灯按钮;光线昏暗，显示闪光灯按钮
if (brightness > 0) {
// 光线明亮，隐藏按钮
[self.maskView hideLightButton];
} else {
// 光线昏暗，显示按钮
[self.maskView showLightButton];
}
————————————————
版权声明：本文为CSDN博主「#公号：iOS逆向」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接： https://blog.csdn.net/z929118967/article/details/103687299
1.9 手电筒
定义属性
/** 手电筒 */
@property (nonatomic, strong) UIButton * flashlight;
初始化手电筒
//
CGFloat flashlight_width = 40;
CGFloat flashlight_height = 40;
self.flashlight = [UIButton buttonWithType:UIButtonTypeCustom];
self.flashlight.frame = CGRectMake(0, 0, flashlight_width, flashlight_height);
//icon_shoukuan_shoudian_p
[self.flashlight setImage:[UIImage imageNamed:@"icon_shoukuan_shoudian"] forState:UIControlStateNormal];
[self.flashlight addTarget:self action:@selector(flashlightAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.flashlight];
处理打开关闭手电筒动作flashlightAction
#pragma mark - 打开/关闭 手电筒
- (void)flashlightAction:(UIButton *)sender{
sender.selected = !sender.selected;
if (sender.selected) {
[sender setImage:[UIImage imageNamed:@"icon_shoukuan_shoudian_p"] forState:UIControlStateSelected];
self.flashlightHintLabel.textColor = ZFColor(133, 235, 0, 1);
//打开闪光灯
AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
if ([captureDevice hasTorch]) {
BOOL locked = [captureDevice lockForConfiguration:&error];//请求独占访问硬件设备
if (locked) {
captureDevice.torchMode = AVCaptureTorchModeOn;
[captureDevice unlockForConfiguration];// 请求解除独占访问硬件设备
}
}
}else{
[sender setImage:[UIImage imageNamed:@"icon_shoukuan_shoudian"] forState:UIControlStateSelected];
self.flashlightHintLabel.textColor = ZFWhite;
//关闭闪光灯
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch]) {
[device lockForConfiguration:nil];
[device setTorchMode: AVCaptureTorchModeOff];
[device unlockForConfiguration];
}
}
}
II 常用视图
2.1 扫描线
2.1.1 采用动画组进行实现
- 扫描线控件
UIImage * scanLine = [UIImage imageNamed:@"img_shoukuan_red"];
self.scanLineImg = [[UIImageView alloc] init];
self.scanLineImg.image = scanLine;
self.scanLineImg.contentMode = UIViewContentModeScaleAspectFit;
[self addSubview:self.scanLineImg];
[self.scanLineImg.layer addAnimation:[self animation] forKey:nil];
动画
/**
* 动画
*/
- (CABasicAnimation *)animation{
CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.duration = 3;
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
animation.repeatCount = MAXFLOAT;
//第一次旋转
if (_isFirstTransition) {
//横屏
if ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft || [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight){
animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.center.y - self.frame.size.height * ZFScanRatio * 0.3 + self.scanLineImg.image.size.height * 0.3))];
animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.center.y + self.frame.size.height * ZFScanRatio * 0.3 - self.scanLineImg.image.size.height * 0.3))];
//竖屏
}else{
animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, self.center.y + self.frame.size.width * ZFScanRatio * 0.1 - self.scanLineImg.image.size.height * 0.5)];
animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x,self.center.y + self.frame.size.width * ZFScanRatio * 0.1 -self.frame.size.width * ZFScanRatio *0.9 )];
//
// animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.topLeftImg.y))];
// animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, self.bottomLeftImg.y)];
}
_isFirstTransition = NO;
//非第一次旋转
}else{
//横屏
if ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft || [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight){
animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.frame.size.height - (self.frame.size.width * ZFScanRatio)) * 0.3)];
animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, self.scanLineImg.frame.origin.y + self.frame.size.width * ZFScanRatio - self.scanLineImg.frame.size.height * 0.3)];
//竖屏
}else{
animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.frame.size.height - (self.frame.size.height * ZFScanRatio)) * 0.3)];
animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, self.scanLineImg.frame.origin.y + self.frame.size.height * ZFScanRatio - self.scanLineImg.frame.size.height * 0.3)];
}
}
return animation;
}
移除动画
/**
* 移除动画
*/
- (void)removeAnimation{
[self.scanLineImg.layer removeAllAnimations];
}
设置扫描线frame
//CGFloat const ZFScanRatio = 0.68f;
self.scanLineImg.frame = CGRectMake((self.frame.size.width - (self.frame.size.width * ZFScanRatio)) * 0.5,
(self.frame.size.height - (self.frame.size.width * ZFScanRatio)) * tmp3,
self.frame.size.width * ZFScanRatio, scanLine.size.height);
2.1.2 定时调用setNeedsDisplay定时redrawn，来实现实现水平扫描线
- 使用定时器进行实现水平扫描线
调用setNeedsDisplay定时redrawn
#pragma mark - 添加定时器
-(void)addTimer {
_timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(timerFire:) userInfo:nil repeats:YES];
[_timer fire];
}
-(void)timerFire:(id)notice {
[self setNeedsDisplay];//Marks the receiver’s entire bounds rectangle as needing to be redrawn.
}
-(void)dealloc {
[_timer invalidate];
}
- (void)drawRect:(CGRect)rect {
rect = _IDCardScanningWindowLayer.frame;
// 人像提示框
// UIBezierPath *facePath = [UIBezierPath bezierPathWithRect:_facePathRect];
// facePath.lineWidth = 1.5;
// [[UIColor whiteColor] set];
// [facePath stroke];
// 水平扫描线
CGContextRef context = UIGraphicsGetCurrentContext();
static CGFloat moveX = 0;
static CGFloat distanceX = 0;
CGContextBeginPath(context);
CGContextSetLineWidth(context, 2);
CGContextSetRGBStrokeColor(context,0.3,0.8,0.3,0.8);
CGPoint p1, p2;// p1, p2 连成水平扫描线;
moveX += distanceX;
if (moveX >= CGRectGetWidth(rect) - 2) {
distanceX = -2;
} else if (moveX <= 2){
distanceX = 2;
}
p1 = CGPointMake(CGRectGetMaxX(rect) - moveX, rect.origin.y);
p2 = CGPointMake(CGRectGetMaxX(rect) - moveX, rect.origin.y + rect.size.height);
CGContextMoveToPoint(context,p1.x, p1.y);
CGContextAddLineToPoint(context, p2.x, p2.y);
/*
// 竖直扫描线
static CGFloat moveY = 0;
static CGFloat distanceY = 0;
CGPoint p3, p4;// p3, p4连成竖直扫描线
moveY += distanceY;
if (moveY >= CGRectGetHeight(rect) - 2) {
distanceY = -2;
} else if (moveY <= 2) {
distanceY = 2;
}
p3 = CGPointMake(rect.origin.x, rect.origin.y + moveY);
p4 = CGPointMake(rect.origin.x + rect.size.width, rect.origin.y + moveY);
CGContextMoveToPoint(context,p3.x, p3.y);
CGContextAddLineToPoint(context, p4.x, p4.y);
*/
CGContextStrokePath(context);
}
2.2 iOS13适配【present 半屏问题】
自定义相机推荐模态展示，并且modalPresentationStyle设置为全屏UIModalPresentationFullScreen
iOS13适配【present 半屏问题】如果没适配会导致列表下拉刷新失效
https://blog.csdn.net/z929118967/article/details/104477314
modalPresentationStyle属性默认不是UIModalPresentationFullScreen了，需要根据需求手动设置。
- (void)K_presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
if (@available(iOS 13.0, *)) {
if (viewControllerToPresent.K_automaticallySetModalPresentationStyle) {
viewControllerToPresent.modalPresentationStyle = UIModalPresentationFullScreen;
}
[self K_presentViewController:viewControllerToPresent animated:flag completion:completion];
} else {
// Fallback on earlier versions
[self K_presentViewController:viewControllerToPresent animated:flag completion:completion];
}
}
————————————————
版权声明：本文为CSDN博主「#公号：iOS逆向」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/z929118967/article/details/104477314iOS13适配:灵活控制模态展示的视图样式（全屏/下滑返回）文中提供完整demo源码
https://kunnan.blog.csdn.net/article/details/106538442
