iOS中Zbar二维码扫描的使用
在iOS开发中，如何使用Zbar扫描第三方库。
1）由于苹果的要求，从2015年2月1日开始，所有新上传的APP必须支持64位已经使用iOS8的SDK。具体苹果方便的声明信息的链接如下：https://developer.apple.com/news/?id=10202014a，当我们在进行二维码扫描时，会发现原来的Zbar库会不支持如下的设备：iPhone 5s,iPhone 6，iPhone 6P，原因就是这三类设备的指令集为arm64。
2）由于必须支持64位的要求，我们引用的第三方库也必须遵守。（主要针对第三方库已静态库文件.a和框架形framework形式存在的），我们可以在终端按下面的操作来判断当前第三个库支持哪些架构（指令集）
a)进入到相应包含第三方框架中静态文件后框架的文件路径
b)在终端使用如下命令 lipo -info libzbar.a
[url=%20https://github.com/eric-schmitt/ZBar-arm64,1] https://github.com/eric-schmitt/ZBar-arm64[/url]
如若我的Zbar库在桌面，你可以按如下步骤。
a)cd /Users/pianopeng/Desktop/ZBar_arm64
b)lipo -info libzbar.a
终端会如下输出：Architectures in the fat file: libzbar.a are: armv7 armv7s i386 x86_64 arm64
其中armv7为iPhone4、4s的CPU使用的指令集，armv7s为5、5c的CPU使用的指令集，arm64为iPhone 5s,iPhone 6，iPhone 6P的CPU使用的指令集。i386 x86_64为模拟器使用的。
有关指令集与架构的相关信息可以参考如下链接的信息http://www.cocoachina.com/industry/20140527/8566.html，以及如何支持64位http://www.cocoachina.com/ios/20141024/10031.html。
3)开始部署Zbar库
a)将Zbar库拖到自己的工程的根目录下，（当然可以按照你自己的喜欢，尽情的添加到哪里，只要你觉得合适）
b)添加相应的框架AVFoundation.framework，CoreMedia.framework，CoreVideo.framework，QuartzCore.framework，libiconv.dylib。
c)开始代码实现，在需要实现扫描的页面里导入#import "ZBarSDK.h"。并遵守相关的协议。具体的代码以及注释如下所示。
#import "ECScanViewController.h"
#import "ZBarSDK.h"
@interface ECScanViewController ()<ZBarReaderDelegate>
@property (strong, nonatomic) ZBarReaderViewController *readerVC;
@property (assign, nonatomic) NSInteger num;
@property (strong, nonatomic) NSTimer *timer;
@end
@implementation ECScanViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.title = @"扫一扫";
self.view.backgroundColor = [UIColor clearColor];
//创建readerVC
self.readerVC= [[ZBarReaderViewController alloc] init];
//设置代理
self.readerVC.readerDelegate = self;
//设置支持的扫描方向
self.readerVC.supportedOrientationsMask = ZBarOrientationMaskAll;
//设置是否显示底部控制按钮
self.readerVC.showsZBarControls = NO;
//设置扫描有效区域
// self.readerVC.scanCrop= CGRectMake(0.1,32/(ScreenHeight - 64), 0.8, (ScreenHeight/2)/(ScreenHeight - 64));
[self.readerVC.scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:0];
//必须将其添加到self.view上
[self.view addSubview:self.readerVC.view];
NSLog(@"self.view %@, self.readerVC.view %@, self.readVC.readerView %@",NSStringFromCGRect(self.view.frame), NSStringFromCGRect(self.readerVC.view.frame), NSStringFromCGRect(self.readerVC.readerView.frame));
//设置覆盖物
[self setOverlayPickerView:self.readerVC];
//设置背景图
[self setScanBackground:self.readerVC];
//添加底部的相册与闪光灯
[self setCameraAndtorchView:self.readerVC];
//创建定时器，使扫描线上下移动
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(movePick_line) userInfo:nil repeats:YES];
}
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
if (self.readerVC) {
[self.readerVC.readerView start];
}
}
- (void)viewWillDisappear:(BOOL)animated{
if (self.readerVC) {
[self.readerVC.readerView stop];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - setOverlayPickerView
- (void)setOverlayPickerView:(ZBarReaderViewController *)reader
{
//最上部view
UIView* upView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, 32)];
upView.alpha = 0.3;
upView.backgroundColor = [UIColor blackColor];
[reader.view addSubview:upView];
//左侧的view
UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 32 , ScreenWidth/10, ScreenHeight / 2)];
leftView.alpha = 0.3;
leftView.backgroundColor = [UIColor blackColor];
[reader.view addSubview:leftView];
//右侧的view
UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(ScreenWidth - ScreenWidth/10, 32, ScreenWidth * 0.8, ScreenHeight/2)];
rightView.alpha = 0.3;
rightView.backgroundColor = [UIColor blackColor];
[reader.view addSubview:rightView];
//底部view
UIView * downView = [[UIView alloc] initWithFrame:CGRectMake(0, ScreenHeight/2 + 32, ScreenWidth, 60)];
downView.alpha = 0.3;
downView.backgroundColor = [UIColor blackColor];
[reader.view addSubview:downView];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(ScreenWidth/10, 20, ScreenWidth * 0.8, 21)];
titleLabel.text = @"将二维码/条码放入框内，即可自动扫描";
titleLabel.textColor = [UIColor whiteColor];
titleLabel.font = [UIFont systemFontOfSize:14];
titleLabel.textAlignment = NSTextAlignmentCenter;
[downView addSubview:titleLabel];
}
#pragma mark - setScanBackground
- (void)setScanBackground:(ZBarReaderViewController *)reader{
UIImageView *pick_bgImgView = [[UIImageView alloc] initWithFrame:CGRectMake(ScreenWidth/10, 32, ScreenWidth * 0.8, ScreenHeight/2)];
pick_bgImgView.image = [UIImage imageNamed:@"pick_bg"];
[reader.view addSubview:pick_bgImgView];
UIImageView *pick_lineImgView = [[UIImageView alloc] initWithFrame:CGRectMake(ScreenWidth/10 + 5, 32, ScreenWidth * 0.8 - 10, 6)];
pick_lineImgView.image = [UIImage imageNamed:@"pick_line"];
pick_lineImgView.tag = 101;
[reader.view addSubview:pick_lineImgView];
}
#pragma mark - 底部的相册以及闪光灯
- (void)setCameraAndtorchView:(ZBarReaderViewController *)reader{
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, ScreenHeight *0.5 +32 +60, ScreenWidth, ScreenHeight *0.5 - 92 - 64)];
view.alpha = 0.8;
view.backgroundColor = [UIColor blackColor];
[reader.view addSubview:view];
}
#pragma mark - movePick_line
- (void)movePick_line{
UIImageView *pick_lineImgView = (UIImageView *)[self.readerVC.view viewWithTag:101];
if (pick_lineImgView.frame.origin.y < 32 + ScreenHeight/2 - 6) {
CGFloat y = pick_lineImgView.frame.origin.y + 2;
pick_lineImgView.frame = CGRectMake(ScreenWidth/10 + 5, y , ScreenWidth *0.8 - 10, 6) ;
}
if (pick_lineImgView.frame.origin.y == 32 + ScreenHeight/2 - 6) {
self.num = 0;
pick_lineImgView.frame = CGRectMake(ScreenWidth/10 + 5, 32, ScreenWidth * 0.8 -10, 6);
}
}
#pragma mark - ZBarReaderDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
// id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
//
// ZBarSymbol *symbol = nil;
// for(symbol in results)
// break;
//
// NSString *barcode = symbol.data;
// NSLog(@"barcode %@", barcode);
UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];
//初始化
ZBarReaderController * readerCtl = [ZBarReaderController new];
//设置代理
readerCtl.readerDelegate = self;
CGImageRef cgImageRef = image.CGImage;
ZBarSymbol * symbol = nil;
id <NSFastEnumeration> results = [readerCtl scanImage:cgImageRef];
for (symbol in results)
break;
NSString * result;
if ([symbol.data canBeConvertedToEncoding:NSShiftJISStringEncoding]){
result = [NSString stringWithCString:[symbol.data cStringUsingEncoding: NSShiftJISStringEncoding] encoding:NSUTF8StringEncoding];
}
else{
result = symbol.data;
}
NSLog(@"%@",result);
//发送扫描结果的通知
[[NSNotificationCenter defaultCenter] postNotificationName:kBarCodeRusult object:self userInfo:@{kBarCodeRusult : result}];
//扫描完毕时，定时器失效，以免耗费内存
[self.timer invalidate];
self.timer = nil;
//停止扫描
[self.readerVC.readerView stop];
//扫描界面退出
[self.navigationController popViewControllerAnimated:YES];
}
@end
