最近做了個外包項目，里面用到了二維碼掃描和微信支付！之前比較熟悉的是ZXing,但是在Xcode7.1里面發現竟然莫名的不支持，木有辦法，從網上查了一下還有一種支持二維碼掃描的東西，沒錯就是接下來我要說的東東，二維碼掃描的利器 ZBarSDK。閑言少絮叨，言歸正傳！
1、下載 ZBarSDK 官網 https://github.com/bmorton/ZBarSDK
2、導入如下框架

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  里面添加下面的代碼
  //二維碼讀取
  [ZBarReaderViewclass];
  4、在二維碼掃描界面開始#import "ZBarSDK.h" ，添加
  <ZBarReaderDelegate,ZBarReaderViewDelegate>委托

下面開始介紹掃描步驟：1.通過攝像頭獲取圖片2.通過Zbar的內部處理方法來識別圖片3.處理信息并顯示

代碼實現：
1.創建視圖

-(void)creatView{ //用于響應掃描事件，點擊開始掃描 button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button setFrame:CGRectMake(110, 200, 100, 40)]; [button setTitle:@"掃描" forState:UIControlStateNormal]; [button addTarget:self action:@selector(scanButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; //用于顯示掃描到的圖像 imageview = [[UIImageView alloc]initWithFrame:CGRectMake(20, 50, 280, 280)]; [self.view addSubview:imageview]; //用于顯示掃描到的信息 label = [[UILabel alloc]initWithFrame:CGRectMake(20, 356, 280, 68)]; [self.view addSubview:label];}
2.掃描二維碼
方法一：直接調用ZBar提供的ZBarReaderViewController打開一個掃描界面
step1：掃描二維碼操作

-(void)scanButtonPressed:(id)sender{ ZBarReaderViewController *reader = [[ZBarReaderViewController alloc]init]; reader.readerDelegate = self; reader.supportedOrientationsMask = ZBarOrientationMaskAll; ZBarImageScanner *scanner = reader.scanner; [scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:0]; [self presentViewController:reader animated:YES completion:nil];}
step2：找到二維碼回調的時候會執行ZBarReaderDelegate的對應方法

• (void) imagePickerController: (UIImagePickerController) reader didFinishPickingMediaWithInfo: (NSDictionary) info{ //通過info獲得結果 id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults]; ZBarSymbol *symbol = nil; for(symbol in results) break; <span style="white-space:pre"> </span> imageview.image = [info objectForKey: UIImagePickerControllerOriginalImage]; //掃描界面退出 [reader dismissViewControllerAnimated:YES completion:nil];}
  方法二：使用ZBar提供的可以嵌在其他視圖中的ZBarReaderView
  step1：掃描二維碼操作

-(void)scanButtonPressed:(id)sender{ ZBarReaderView *readerView = [[ZBarReaderView alloc]init]; readerView.frame = CGRectMake(10, 44, 300, 300); readerView.readerDelegate = self; //掃描區域 CGRect scanMaskRect = CGRectMake(60, CGRectGetMidY(readerView.frame) - 126, 200, 200); //處理模擬器 if (TARGET_IPHONE_SIMULATOR) { ZBarCameraSimulator *cameraSimulator = [[ZBarCameraSimulator alloc]initWithViewController:self]; cameraSimulator.readerView = readerView; } [self.view addSubview:readerView]; //掃描區域計算 readerView.scanCrop = [self getScanCrop:scanMaskRect readerViewBounds:readerView.bounds]; //調用ZBarReaderView的start方法開始掃描 [readerView start];}
step2：掃描區域計算

-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds{ CGFloat x,y,width,height; x = rect.origin.x / readerViewBounds.size.width; y = rect.origin.y / readerViewBounds.size.height; width = rect.size.width / readerViewBounds.size.width; height = rect.size.height / readerViewBounds.size.height; return CGRectMake(x, y, width, height);}
step3：在掃描到二維碼回調的時候會執行ZBarReaderViewDelegate的對應方法

• (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image{　　 for (ZBarSymbol *symbol in symbols)　　 { NSLog(@"%@", symbol.data);　　　　　　　　//將信息顯示在lable上　　　　　　　　label.text = symbol.data ;　　　　 break;　　 }　　//調用ZBarReaderView的stop方法停止掃描 [readerView stop];}另外有一點需要注意的地方，二維碼掃描所在頁面和其他頁面間的跳轉盡量用
  SaoMiaoVC *saomiao = [[[SaoMiaoVC alloc]init]autorelease];
  saomiao.hidesBottomBarWhenPushed=YES;
  saomiao.delegate=self;
  UINavigationController *nav= [[[UINavigationController alloc] initWithRootViewController:saomiao] autorelease];
  [self presentViewController:nav animated:YES completion:nil]; 這種方式，因為用push 的話容易因為退出或者銷毀得不及時而產生各種各樣的問題！