Question

我收到了上述错误。有人可以向我解释这意味着什么以及如何解决它？我的代码如下：

   UIButton *btn = (UIButton *)sender;
__weak UIButton *weakBtn = btn;
btn.enabled = NO;
    AVCaptureConnection *videoConnection = nil;
    for (AVCaptureConnection *connection in self.stillImageOutput.connections) {
        for (AVCaptureInputPort *port in [connection inputPorts]) {
            if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
                videoConnection = connection;
                break;
            }
        }
        if (videoConnection) {
            break;
        }
    }

    [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {


        NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
        UIImage *image = [[UIImage alloc] initWithData:imageData];

        [self pushImagePreviewVCWithImage:image];
             // UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
        weakBtn.enabled = YES;

根据碰撞学的说法，它正在破坏if（videoConnection）{break; }

我一直在努力寻找解决方案。我还发现了一个同样崩溃的教程，但它没有修复。 http://www.musicalgeometry.com/?p=1297

谢谢！

这是错误：

0  CoreFoundation                 0x00000001838602d8 __exceptionPreprocess
1  libobjc.A.dylib                0x000000019552c0e4 objc_exception_throw
2  AVFoundation                   0x00000001820c17a4 -[AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection:completionHandler:]
3  First Derm                     0x000000010011fff4 -[CameraOverlayVC captureNow:] (CameraOverlayVC.m:124)
4  UIKit                          0x000000018830d398 -[UIApplication sendAction:to:from:forEvent:]
5  UIKit                          0x00000001882f6474 -[UIControl _sendActionsForEvents:withEvent:]
6  UIKit                          0x000000018830cd34 -[UIControl touchesEnded:withEvent:]
7  UIKit                          0x000000018830c9c0 -[UIWindow _sendTouchesForEvent:]
8  UIKit                          0x0000000188305efc -[UIWindow sendEvent:]
9  UIKit                          0x00000001882d9120 -[UIApplication sendEvent:]
10 UIKit                          0x000000018857a2b8 _UIApplicationHandleEventFromQueueEvent
11 UIKit                          0x00000001882d7634 _UIApplicationHandleEventQueue
12 CoreFoundation                 0x0000000183818240 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
13 CoreFoundation                 0x00000001838174e4 __CFRunLoopDoSources0
14 CoreFoundation                 0x0000000183815594 __CFRunLoopRun
15 CoreFoundation                 0x00000001837412d4 CFRunLoopRunSpecific
16 GraphicsServices               0x000000018d1976fc GSEventRunModal
17 UIKit                          0x000000018833ef40 UIApplicationMain
18 First Derm                     0x00000001000cbed8 main (main.m:14)
19 libdyld.dylib                  0x0000000195bd6a08 start

Answer 1

这就是我在项目中的表现，而且效果很好。

定义自定义序列队列以在后台处理此问题
观察价值的KVO模式。

您可以参考我的示例课程：https://github.com/htaiwan/CameraSnapShot

AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection：completionHandler无效/无效连接已通过？

1 个答案: