“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];
}
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）。
// 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;
}
”摇一摇“的动画效果：
- (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"];
}
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
- (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];
});
});
}
在viewwillappear和viewwilldisappear里对session做优化（timer是个扫描动画的计时器）
- (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];
}
处理扫描结果
- (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) {
//扫描完成
}
}
用二维码扫描器扫描自己的二维码：
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
}
最后附上自己完整的源码：
// 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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