不明觉厉iOS带我飞2iOS移动开发

iOS 二维码扫描

2015-09-18  本文已影响1928人  David_Cap

iOS开发中 二维码扫描

前言

在移动开发中二维码扫描这种事情越来越常见了,在iOS中我选择了用ZBar这个第三方来实现。

原因有三:好用,好用,好用。

好了来点正经的干货吧。首先献上下载地址:快来点我

然后你就可以把整个 ZBar文件夹拉到你的项目的Lib之类的目录下面了。

如果用pod,就直接 pod 'ZBarSDK', '~> 1.3.1' , 那么你就可以越过下面那个添加库类的步骤了。

ZBar的使用给我们俩种选择,一种是自定义一个二维码视图,另一种是用他们自带的二维码视图(奇丑无比)。

添加库类

如下添加这些库类。

ZBar库类

自定义二维码视图

一般都是给一个按钮绑定一个点击事件,然后当按钮点击的时候 就会调用二维码扫描,然后扫描成功就返回。

就像下面这个demo截图一样。

Demo截图.png

然后就是正题了,我们首先要#import "ZBarSDK.h".然后自定义的话 就要遵循这个代理<ZBarReaderViewDelegate>

然后就可以在点击的回调函数中设置如下:

    // Do any additional setup after loading the view.
    //初始化照相机窗口 这个readview 就是要美化的view
    ZBarReaderView *readview = [ZBarReaderView new];
    //自定义大小
    readview.frame = CGRectMake(100, 100, 300, 300);
    //自定义添加相关指示.........发挥各自的APP的想象力
    //此处省略美化10000行代码...................
    //………………………..
    // 好进入正题—— 接着设置好代理
    readview.readerDelegate = self;
    
    //将其照相机拍摄视图添加到要显示的视图上
    [self.view addSubview:readview];
    
    
    //二维码/条形码识别设置
    ZBarImageScanner *scanner = readview.scanner;
    
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    //启动,必须启动后,手机摄影头拍摄的即时图像菜可以显示在readview上
    [readview start];

还要实现如下delegate方法,监听扫描成功回调:

-(void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
    ZBarSymbol *symbol = nil;
    for (symbol in symbols)
    {
        break;
    }
    //扫描成功,让readerView消失 
    [readerView removeFromSuperview];
    
    //这个是二维码得到的数据
    NSString *data = symbol.data;
    //数据处理 
    //.......
}

自带的二维码视图

和上面不同的是,这次我们要遵从的delegate变了是<ZBarReaderDelegate>.

然后再cilck方法里实现以下代码:

    //初始化相机控制器
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    //设置代理
    reader.readerDelegate = self;
    //基本适配
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;

    //二维码/条形码识别设置
    ZBarImageScanner *scanner = reader.scanner;

    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    //弹出系统照相机,全屏拍摄
    [self presentModalViewController: reader animated: YES];

然后实现以下的delegate.

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    id<NSFastEnumeration> symbols = [info objectForKey:ZBarReaderControllerResults];
    
    ZBarSymbol *symbol = nil;
    for (symbol in symbols)
    {
        break;
    }
    
    [picker dismissModalViewControllerAnimated:YES];
    
    //数据
    NSString *data = symbol.data;
}

我自定义的 二维码View

- (void)setOverlayPickerView:(ZBarReaderView *)reader
{
    
    //清除原有控件
    
    for (UIView *temp in [reader subviews]) {
        
        for (UIButton *button in [temp subviews]) {
            
            if ([button isKindOfClass:[UIButton class]]) {
                
                [button removeFromSuperview];
                
            }
            
        }
        
        for (UIToolbar *toolbar in [temp subviews]) {
            
            if ([toolbar isKindOfClass:[UIToolbar class]]) {
                
                [toolbar setHidden:YES];
                
                [toolbar removeFromSuperview];
                
            }
            
        }
        
    }
    
    /*
    //画中间的基准线 可有可无 个人爱好
    
    UIView* line = [[UIView alloc] initWithFrame:CGRectMake(40, 220, 240, 1)];
    
    line.backgroundColor = [UIColor redColor];
    
    [reader addSubview:line];
    */

    
    //最上部view
    
    UIView* upView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 80)];
    
    upView.alpha = 0.3;
    
    upView.backgroundColor = [UIColor blackColor];
    
    [reader addSubview:upView];
    

    //左侧的view
    
    UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 80, 20, 280)];
    
    leftView.alpha = 0.3;
    
    leftView.backgroundColor = [UIColor blackColor];
    
    [reader addSubview:leftView];
    

    
    //右侧的view
    
    UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(300, 80, 20, 280)];
    
    rightView.alpha = 0.3;
    
    rightView.backgroundColor = [UIColor blackColor];
    
    [reader addSubview:rightView];
    

    
    //底部view
    
    UIView * downView = [[UIView alloc] initWithFrame:CGRectMake(0, 360, 320, 120)];
    
    downView.alpha = 0.3;
    
    downView.backgroundColor = [UIColor blackColor];
    
    [reader addSubview:downView];
    
    
    //用于说明的label
    
    UILabel * labIntroudction= [[UILabel alloc] init];
    
    labIntroudction.backgroundColor = [UIColor clearColor];
    
    labIntroudction.frame=CGRectMake((ScreenW - 280)*0.5,8, 280, 40);
    
    labIntroudction.numberOfLines=2;
    
    labIntroudction.textColor=[UIColor whiteColor];
    
    labIntroudction.font = Font(15);
    
    labIntroudction.text=@"将二维码图像置于矩形方框内";
    labIntroudction.textAlignment = NSTextAlignmentCenter;
    
    [downView addSubview:labIntroudction];
    
    /*
    //用于取消操作的button 可有可无
    
    UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    
    cancelButton.alpha = 0.4;
    
    [cancelButton setFrame:CGRectMake(20, 390, 280, 40)];
    
    [cancelButton setTitle:@"将二维码图像置于矩形方框内" forState:UIControlStateNormal];
    
    [cancelButton.titleLabel setFont:[UIFont boldSystemFontOfSize:20]];
    
    [cancelButton addTarget:self action:@selector(dismissOverlayView:)forControlEvents:UIControlEventTouchUpInside];  
    
    [reader addSubview:cancelButton];
     */
    
}

总结

俩种方式都挺简单的,建议用自定义的,因为灵活 漂亮。

参考致谢

http://www.yanyulin.info/pages/2015/01/25901846652567.html

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