“摇一摇”功能的实现：
iPhone对 “摇一摇”有很好的支持，总体说来就两步：
在视图控制器中打开接受“摇一摇”的开关;
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- (void)viewDidLoad {
// 设置允许摇一摇功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
// 并让自己成为第一响应者
[self becomeFirstResponder];
}
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在“摇一摇”触发的制定的方法中实现需要实现的功能（”摇一摇“检测方法）。
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// 摇一摇开始摇动
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"开始摇动");
//添加“摇一摇”动画
[self addAnimations];
//音效
AudioServicesPlaySystemSound (soundID);
return;
}
// “摇一摇”取消摇动
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog(@"取消摇动");
return;
}
// “摇一摇”摇动结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.subtype == UIEventSubtypeMotionShake) { // 判断是否是摇动结束
NSLog(@"摇动结束");
}
return;
}
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”摇一摇“的动画效果：
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- (void)addAnimations {
//音效
AudioServicesPlaySystemSound (soundID);
//让上面图片的上下移动
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;
//让下面的图片上下移动
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"];
}
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注意：在模拟器中运行时，可以通过「Hardware」-「Shake Gesture」来测试「摇一摇」功能。如下:
“扫一扫”功能的实现：
基于AVCaptureDevice做的二维码扫描器，基本步骤如下：
初始化相机，生成扫描器
设置参数
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- (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];
}
// 条码类型 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];
});
});
}
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在viewWillAppear和viewWillDisappear里对session做优化（timer是个扫描动画的计时器）
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- (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];
}
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处理扫描结果
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- (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) {
//扫描完成
}
}
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用二维码扫描器扫描自己的二维码：
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NSString *url = [NSURL URLWithString:@"html/judgement.html" relativeToURL:[ZXApiClient sharedClient].baseURL].absoluteString;
if ([stringValue hasPrefix:url]) {
//如果扫出来的url是自己的域名开头的，那么做如下的处理
}
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最后附上自己完整的源码：
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// 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;//扫描的显示视图
/**
* 二维码扫描参数
*/
@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;//扫描线
(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 ;
//初始化闪光灯设备
lightDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//扫描范围
_centerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame))];
_centerView.backgroundColor = [UIColor clearColor];
[self.view addSubview:_centerView];
//扫描的视图加载
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 = @"请将企业邀请码放入扫描框内";
[self.centerView addSubview:labIntroudction];
UIButton *openLight = [[UIButton alloc]initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2-25, 470, 50, 50)];
[openLight setImage:[UIImage imageNamed:@"灯泡"] forState:UIControlStateNormal];
[openLight setImage:[UIImage imageNamed:@"灯泡2"] forState:UIControlStateSelected];
[openLight addTarget:self action:@selector(openLightWay:) forControlEvents:UIControlEventTouchUpInside];
[self.centerView addSubview:openLight];
//扫描线
_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 -- 设置参数
- (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];
}
// 条码类型 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];
});
});
}
//扫描动画
- (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]) {//判断是否有闪光灯
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"当前设备没有闪光灯，不能提供手电筒功能" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" 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) {
//扫描完成
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/forever_wj/article/details/50890903