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[英]iOS 8 works but iOS 7 crashes with -[NSNull length]: unrecognized selector sent to instance
[英]IOS - ZBarSDK - application crashes with -[UILabel length]: unrecognized selector sent to instance
当我直接打开相机的QRCode视图时,它崩溃了。 但是,当我没有直接在QRCode开始时打开相机的视图时,它就可以正常工作。 我已经用一个空的应用程序尝试了相同的代码,并且效果很好。 只是发生这种情况。 所有的IBOutlets和IBActions都在工作,这是我的代码:
SerialController.h:
#import <UIKit/UIKit.h>
#import "ZBarSDK.h"
@interface SerialController : UIViewController <ZBarReaderDelegate>
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *spinner;
@property (weak, nonatomic) IBOutlet UILabel *description;
@property (weak, nonatomic) IBOutlet UIImageView *key;
@property (weak, nonatomic) IBOutlet UILabel *resultText;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *qrSearchButton;
@property (weak, nonatomic) IBOutlet UIView *contentHolder;
@property (weak, nonatomic) IBOutlet UIImageView *turkcellLogo;
@property (weak, nonatomic) IBOutlet UIImageView *backgroundImage;
@end
串行控制器
- (IBAction)handleQrSearchButtonTap:(id)sender {
ZBarReaderViewController *codeReader = [ZBarReaderViewController new];
codeReader.readerDelegate=self;
codeReader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner = codeReader.scanner;
[scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0];
[self presentViewController:codeReader animated:YES completion:nil];
}
#pragma mark - ZBar's Delegate method
- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
// get the decode results
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
// just grab the first barcode
break;
// showing the result on textview
self.resultText.text = symbol.data;
// dismiss the controller
[reader dismissViewControllerAnimated:YES completion:nil];
}
您不想使用称为description
属性。 我花了几个小时试图解决完全相同的问题。 description
是NSObject中的标准方法,您将其隐藏。 将其重命名为其他名称。
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