iOS中使用ZBar掃描二維碼自定義掃描界面

之前在Android中使用過ZXing識別二維碼，ZXing也有對應的iOS版本，經過了解，ZBar也是一個常用的二維碼識別軟件，並分別提供了iOS和Android的SDK可供使用，最終我選擇了ZBar進行二維碼識別，它的註釋清晰，便於使用。

ZBar爲我們提供了兩種使用方式，一種是直接調用ZBar提供的ZBarReaderViewController打開一個掃描界面，另一種方式是使用ZBar提供的可以嵌在其他視圖中的ZBarReaderView，實際項目中我們更可能會使用第二種方式，這可以讓我們對界面做更多的定製。

ZBar使用起來也非常簡單，將ZBarSDK導入項目，在需要使用ZBar的文件中導入ZBarSDK.h頭文件即可

#pragma mark 初始化掃描
- (void)InitScan
{
    readview = [ZBarReaderView new];
    readview.backgroundColor = [UIColor clearColor];
    readview.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    readview.readerDelegate = self;
    readview.allowsPinchZoom = YES;//使用手勢變焦
    readview.trackingColor = [UIColor redColor];
    readview.showsFPS = NO;// 顯示幀率  YES 顯示  NO 不顯示
    //readview.scanCrop = CGRectMake(0, 0, 1, 1);//將被掃描的圖像的區域

    UIImage *hbImage=[UIImage imageNamed:@"pick_bg.png"];
    scanZomeBack=[[UIImageView alloc] initWithImage:hbImage];
    //添加一個背景圖片
    CGRect mImagerect=CGRectMake((readview.frame.size.width-200)/2.0, (readview.frame.size.height-200)/2.0, 200, 200);
    [scanZomeBack setFrame:mImagerect];
    readview.scanCrop = [self getScanCrop:mImagerect readerViewBounds:readview.bounds];//將被掃描的圖像的區域

    [readview addSubview:scanZomeBack];
    [readview addSubview:readLineView];
    [self.view addSubview:readview];
    [readview start];

}

#pragma mark 獲取掃描區域
-(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);
}

#pragma mark 掃描動畫
-(void)loopDrawLine
{
    CGRect  rect = CGRectMake(scanZomeBack.frame.origin.x, scanZomeBack.frame.origin.y, scanZomeBack.frame.size.width, 2);
    if (readLineView) {
        [readLineView removeFromSuperview];
    }
    readLineView = [[UIImageView alloc] initWithFrame:rect];
    [readLineView setImage:[UIImage imageNamed:@"line.png"]];
    [UIView animateWithDuration:3.0
                          delay: 0.0
                        options: UIViewAnimationOptionCurveEaseIn
                     animations:^{
                         //修改fream的代碼寫在這裏
                         readLineView.frame =CGRectMake(scanZomeBack.frame.origin.x, scanZomeBack.frame.origin.y+scanZomeBack.frame.size.height, scanZomeBack.frame.size.width, 2);
                         [readLineView setAnimationRepeatCount:0];

                     }
                     completion:^(BOOL finished){
                         if (!is_Anmotion) {

                             [self loopDrawLine];
                         }

                     }];

    [readview addSubview:readLineView];

}

#pragma mark 獲取掃描結果
- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
    // 得到掃描的條碼內容
    const zbar_symbol_t *symbol = zbar_symbol_set_first_symbol(symbols.zbarSymbolSet);
    NSString *symbolStr = [NSString stringWithUTF8String: zbar_symbol_get_data(symbol)];
    if (zbar_symbol_get_type(symbol) == ZBAR_QRCODE) {
        // 是否QR二維碼
    }

    for (ZBarSymbol *symbol in symbols) {
        [sTxtField setText:symbol.data];
        break;
    }

    [readerView stop];
    [readerView removeFromSuperview];


}

github地址:https://github.com/ZBar/ZBar