"搖一搖"功能的實現：
iPhone對 "搖一搖"有很好的支持，總體說來就兩步：
- (void)viewDidLoad {// 設置允許搖一搖功能[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;// 并讓自己成為第一響應者[self becomeFirstResponder];
}
- 在“搖一搖”觸發的制定的方法中實現需要實現的功能（”搖一搖“檢測方法）。
pragma mark - “搖一搖”相關方法
// 搖一搖開始搖動
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { NSLog(@"開始搖動");//添加“搖一搖”動畫[self addAnimations];//音效AudioServicesPlaySystemSound (soundID); return;
} // “搖一搖”取消搖動
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event { NSLog(@"取消搖動"); return;
} // “搖一搖”搖動結束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (event.subtype == UIEventSubtypeMotionShake) { // 判斷是否是搖動結束 NSLog(@"搖動結束"); } return;
}
”搖一搖“的動畫效果：
pragma mark - “搖一搖”動畫效果
- (void)addAnimations {//音效AudioServicesPlaySystemSound (soundID);//讓上面圖片的上下移動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：在模擬器中運行時，可以通過「Hardware」-「Shake Gesture」來測試「搖一搖」功能。如下:
“掃一掃”功能的實現：
基于AVCaptureDevice做的二維碼掃描器，基本步驟如下：
pragma mark -- 設置參數- (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session做優化（timer是個掃描動畫的計時器）
- (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];
}
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}
}
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}
// 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
*/
@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 = @"請將企業邀請碼放入掃描框內";[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 -- 設置參數
- (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:@"當前設備沒有閃光燈，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
總結
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