“搖一搖”功能的實(shí)現(xiàn)：
iPhone對(duì) “搖一搖”有很好的支持，總體說來就兩步：
在視圖控制器中打開接受“搖一搖”的開關(guān);
- (void)viewDidLoad { // 設(shè)置允許搖一搖功能 [UIApplication sharedApplication].applicationSupportsShakeToEdit = YES; // 并讓自己成為第一響應(yīng)者 [self becomeFirstResponder];}在“搖一搖”觸發(fā)的制定的方法中實(shí)現(xiàn)需要實(shí)現(xiàn)的功能（”搖一搖“檢測方法）。
// 搖一搖開始搖動(dòng) - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { NSLog(@"開始搖動(dòng)"); //添加“搖一搖”動(dòng)畫 [self addAnimations]; //音效 AudioServicesPlaySystemSound (soundID); return; } // “搖一搖”取消搖動(dòng) - (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event { NSLog(@"取消搖動(dòng)"); return; } // “搖一搖”搖動(dòng)結(jié)束 - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (event.subtype == UIEventSubtypeMotionShake) { // 判斷是否是搖動(dòng)結(jié)束 NSLog(@"搖動(dòng)結(jié)束"); } return; } ”搖一搖“的動(dòng)畫效果：
- (void)addAnimations { //音效 AudioServicesPlaySystemSound (soundID); //讓上面圖片的上下移動(dòng) CABasicAnimation *translation2 = [CABasicAnimation animationWithKeyPath:@"position"]; translation2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; translation2.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 115)]; translation2.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 40)]; translation2.duration = 0.4; translation2.repeatCount = 1; translation2.autoreverses = YES; //讓下面的圖片上下移動(dòng) CABasicAnimation *translation = [CABasicAnimation animationWithKeyPath:@"position"]; translation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; translation.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 345)]; translation.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 420)]; translation.duration = 0.4; translation.repeatCount = 1; translation.autoreverses = YES; [imgDown.layer addAnimation:translation forKey:@"translation"]; [imgUp.layer addAnimation:translation2 forKey:@"translation2"]; }注意：在模擬器中運(yùn)行時(shí)，可以通過「Hardware」-「Shake Gesture」來測試「搖一搖」功能。如下:
“掃一掃”功能的實(shí)現(xiàn)：
基于AVCaptureDevice做的二維碼掃描器，基本步驟如下：
初始化相機(jī)，生成掃描器
設(shè)置參數(shù)
- (void)setupCamera { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil]; _output = [[AVCaptureMetadataOutput alloc]init]; [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; _session = [[AVCaptureSession alloc]init]; [_session setSessionPreset:AVCaptureSessionPresetHigh]; if ([_session canAddInput:self.input]) { [_session addInput:self.input]; } if ([_session canAddOutput:self.output]) { [_session addOutput:self.output]; } // 條碼類型 AVMetadataObjectTypeQRCode _output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil]; dispatch_async(dispatch_get_main_queue(), ^{ //更新界面 _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session]; _preview.videoGravity = AVLayerVideoGravityResizeAspectFill; _preview.frame = CGRectMake(0, 0, CGRectGetWidth(self.centerView.frame), CGRectGetHeight(self.centerView.frame)); [self.centerView.layer insertSublayer:self.preview atIndex:0]; [_session startRunning]; }); });}在viewWillAppear和viewWillDisappear里對(duì)session做優(yōu)化（timer是個(gè)掃描動(dòng)畫的計(jì)時(shí)器）
- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (_session && ![_session isRunning]) { [_session startRunning]; } timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(scanningAnimation) userInfo:nil repeats:YES]; [self setupCamera];} - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; _count = 0; [timer invalidate]; [self stopReading];}處理掃描結(jié)果
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { NSString *stringValue; if ([metadataObjects count] >0){ AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0]; stringValue = metadataObject.stringValue; NSLog(@"%@",stringValue); } [_session stopRunning]; [timer invalidate]; _count ++ ; [self stopReading]; if (stringValue && _count == 1) { //掃描完成 }}用二維碼掃描器掃描自己的二維碼：
NSString *url = [NSURL URLWithString:@"html/judgement.html" relativeToURL:[ZXApiClient sharedClient].baseURL].absoluteString; if ([stringValue hasPrefix:url]) { //如果掃出來的url是自己的域名開頭的，那么做如下的處理 }最后附上自己完整的源碼：
// Created by Ydw on 16/3/15. // Copyright © 2016年 IZHUO.NET. All rights reserved. //import “ViewController.h” import <AVFoundation/AVFoundation.h>@interface ViewController () { int number; NSTimer *timer; NSInteger _count; BOOL upOrdown; AVCaptureDevice *lightDevice; }@property (nonatomic,strong) UIView *centerView;//掃描的顯示視圖/** * 二維碼掃描參數(shù) */ @property (strong,nonatomic) AVCaptureDevice *device; @property (strong,nonatomic) AVCaptureDeviceInput *input; @property (strong,nonatomic) AVCaptureMetadataOutput *output; @property (strong,nonatomic) AVCaptureSession *session; @property (strong,nonatomic) AVCaptureVideoPreviewLayer *preview; @property (nonatomic,retain) UIImageView *imageView;//掃描線(void)setupCamera;(void)stopReading;@end @implementation ViewController- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (_session && ![_session isRunning]) { [_session startRunning]; } timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(scanningAnimation) userInfo:nil repeats:YES]; [self setupCamera];}- (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor clearColor]; self.automaticallyAdjustsScrollViewInsets = NO; _count = 0 ; //初始化閃光燈設(shè)備 lightDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //掃描范圍 _centerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame))]; _centerView.backgroundColor = [UIColor clearColor]; [self.view addSubview:_centerView]; //掃描的視圖加載 UIView *scanningViewOne = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 120)]; scanningViewOne.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4]; [self.centerView addSubview:scanningViewOne]; UIView *scanningViewTwo = [[UIView alloc]initWithFrame:CGRectMake(0, 120, (self.view.frame.size.width-300)/2, 300)]; scanningViewTwo.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4]; [self.centerView addSubview:scanningViewTwo]; UIView *scanningViewThree = [[UIView alloc]initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2+150, 120, (self.view.frame.size.width-300)/2, 300)]; scanningViewThree.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4]; [self.centerView addSubview:scanningViewThree]; UIView *scanningViewFour = [[UIView alloc]initWithFrame:CGRectMake(0, 420, self.view.frame.size.width,CGRectGetHeight(self.view.frame)- 420)]; scanningViewFour.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4]; [self.centerView addSubview:scanningViewFour]; UILabel *labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake(15, 430, self.view.frame.size.width - 30, 30)]; labIntroudction.backgroundColor = [UIColor clearColor]; labIntroudction.textAlignment = NSTextAlignmentCenter; labIntroudction.textColor = [UIColor whiteColor]; labIntroudction.text = @"請將企業(yè)邀請碼放入掃描框內(nèi)"; [self.centerView addSubview:labIntroudction]; UIButton *openLight = [[UIButton alloc]initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2-25, 470, 50, 50)]; [openLight setImage:[UIImage imageNamed:@"燈泡"] forState:UIControlStateNormal]; [openLight setImage:[UIImage imageNamed:@"燈泡2"] forState:UIControlStateSelected]; [openLight addTarget:self action:@selector(openLightWay:) forControlEvents:UIControlEventTouchUpInside]; [self.centerView addSubview:openLight]; //掃描線 _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2-110, 130, 220, 5)]; _imageView.image = [UIImage imageNamed:@"scanning@3x"]; [self.centerView addSubview:_imageView];}- (void)viewWillDisappear:(BOOL)animated { _count= 0; [timer invalidate]; [self stopReading];}pragma mark -- 設(shè)置參數(shù)- (void)setupCamera { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil]; _output = [[AVCaptureMetadataOutput alloc]init]; [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; _session = [[AVCaptureSession alloc]init]; [_session setSessionPreset:AVCaptureSessionPresetHigh]; if ([_session canAddInput:self.input]) { [_session addInput:self.input]; } if ([_session canAddOutput:self.output]) { [_session addOutput:self.output]; } // 條碼類型 AVMetadataObjectTypeQRCode _output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil]; dispatch_async(dispatch_get_main_queue(), ^{ //更新界面 _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session]; _preview.videoGravity = AVLayerVideoGravityResizeAspectFill; _preview.frame = CGRectMake(0, 0, CGRectGetWidth(self.centerView.frame), CGRectGetHeight(self.centerView.frame)); [self.centerView.layer insertSublayer:self.preview atIndex:0]; [_session startRunning]; }); });}//掃描動(dòng)畫- (void)scanningAnimation { if (upOrdown == NO) { number ++; _imageView.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2-115, 130+2*number, 230, 5); if (2*number == 280) { upOrdown = YES; } } else { number --; _imageView.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2-115, 130+2*number, 230, 5); if (number == 0) { upOrdown = NO; } }}- (void)stopReading { [_session stopRunning]; _session = nil; [_preview removeFromSuperlayer]; [timer invalidate]; timer = nil ;}-(void)openLightWay:(UIButton *)sender { if (![lightDevice hasTorch]) {//判斷是否有閃光燈 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"當(dāng)前設(shè)備沒有閃光燈，不能提供手電筒功能" message:nil preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleCancel handler:nil]; [alert addAction:sureAction]; [self presentViewController:alert animated:YES completion:nil]; return; } sender.selected = !sender.selected; if (sender.selected == YES) { [lightDevice lockForConfiguration:nil]; [lightDevice setTorchMode:AVCaptureTorchModeOn]; [lightDevice unlockForConfiguration]; } else { [lightDevice lockForConfiguration:nil]; [lightDevice setTorchMode: AVCaptureTorchModeOff]; [lightDevice unlockForConfiguration]; }}pragma mark -- AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { NSString *stringValue; if ([metadataObjects count] >0){ AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0]; stringValue = metadataObject.stringValue; NSLog(@"%@",stringValue); } [_session stopRunning]; [timer invalidate]; _count ++ ; [self stopReading]; if (stringValue && _count == 1) { //掃描完成 }}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持武林網(wǎng)。
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