Question

我正在尝试使用ZBar实现一些qr代码阅读器。过了一段时间我确实设法做了阅读，但经过几次阅读后，应用程序往往变得越来越慢（直到几乎没有响应）。这个SDK与iOS7兼容？框架：libiconv.dylib，libinfo.dylib，QuartzCore，CoreVideo，CoreMedia，AVFoundation，CoreGraphics，UIKit，XCTest

- (IBAction)scan:(id)sender {
    //initialize the reader and provide some config instructions
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    reader.readerDelegate = self;

    [reader.scanner setSymbology: ZBAR_I25
                          config: ZBAR_CFG_ENABLE
                              to: 1];
    reader.cameraFlashMode=UIImagePickerControllerCameraFlashModeOff;
    reader.readerView.zoom = 1.0; // define camera zoom property

    //show the scanning/camera mode
    [self presentModalViewController:reader animated:YES];
    // Do any additional setup after loading the view from its nib.
}
- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info {

    //this contains your result from the scan
    id results = [info objectForKey: ZBarReaderControllerResults];

    //create a symbol object to attach the response data to
    ZBarSymbol *symbol = nil;

    //add the symbol properties from the result
    //so you can access it
    for(symbol in results){

        //symbol.data holds the value
        NSString *upcString = symbol.data;

        //print to the console
        NSLog(@"the value of the scanned UPC is: %@",upcString);

        NSMutableString *message = [[NSMutableString alloc]
                                    initWithString: @"Scanned Barcode: "];

        [message appendString:[NSString stringWithFormat:@"%@ ",
                               upcString]];

        //Create UIAlertView alert
        UIAlertView  *alert = [[UIAlertView alloc]
                               initWithTitle:@"Product Barcode" message: message delegate:self
                               cancelButtonTitle:@"Cancel" otherButtonTitles: nil];

        self.viewResult.text = upcString;
        [alert show];
        //After some time
        [alert dismissWithClickedButtonIndex:0 animated:TRUE];

        //make the reader view go away
        [reader dismissModalViewControllerAnimated: YES];
    }

}

编辑：读取4或5次后，这是内存和CPU消耗 - ＆gt; http://diogomend.me/images/capt.png。基督：D

Answer 1

好吧，在检查了这个问题Memory related issue of ZBarReaderViewController in iOS 7之后，我确实设法解决了这个问题。我添加的行如下：

（在我的viewcontroller.h中）

@property (strong,nonatomic) ZBarReaderViewController *reader;

（在我的viewcontroller.m中）

if(self.reader) 
{
    [self.reader.readerView stop]; 
    for(UIView *subViews in self.reader.view.subviews) 
    [subViews removeFromSuperview];
    [self.reader.view removeFromSuperview];
    self.reader.view = nil;
}
_reader = [ZBarReaderViewController new];

ZBar SDK在IOS7中放慢速度

1 个答案: