iOS ZBarReaderView如何实现强制聚焦，提高聚焦度，有相关的方法和属性吗

Question

如同ZBarViewController有相关方法：
ZBarReaderViewController *reader = [ZBarReaderViewController new];

reader.readerDelegate = self;
reader.videoQuality = UIImagePickerControllerQualityTypeHigh;
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:1];

reader.showsZBarControls =NO;
[self setOverlayPickerView:reader];
[self presentViewController:reader animated:YES completion:nil];

ZBarReaderView有相关的提高聚焦的方法的吗？现在ZBarReaderView在有些机型上很难扫出小型的条形码

Answer 1

There is an attribute in ZBarReaderView which is AVCaptureSession. Change readonly to strong, import <AVFoundation/AVFoundation.h> in the file that calls ZBarReaderView, and then set it like this [_readerView.session setSessionPreset:AVCaptureSessionPresetHigh]; to scan small barcodes. That's pretty quick.