Question

我尝试使用以下代码创建自定义UIImagePickerController。的 ECPhotoPickerController.h

@interface ECPhotoPickerController : UIImagePickerController
@property (strong, nonatomic) void(^didFinishSavingPhoto)(NSURL* url, UIImage* image);
@property (strong, nonatomic) void(^didDismissed)(void);
@end

ECPhotoPickerController.m

...
- (void)viewDidLoad {
    [super viewDidLoad];

    self.sourceType = UIImagePickerControllerSourceTypeCamera;
    self.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
    self.showsCameraControls = false;

    [self setCameraOverlayView:self.overlayView];
    self.delegate = self;        
}
...

点击按钮后，将显示自定义图像选择器控制器，这将调用以下方法。

- (void)showImagePicker {

    ECPhotoPickerController* vc = [[ECPhotoPickerController alloc] init];
    vc.didFinishSavingPhoto = ^(NSURL *url, UIImage *image) {
        self.selectedImage = image;
    };
    vc.didDismissed = ^{
        // dismissed
    };
    [self presentViewController:vc animated:true completion:nil];
}

但该应用将在iOS 11上以日志

崩溃

[UIViewController _setCameraOverlayView:]: unrecognized selector sent to instance 0x108403dd0

并且在崩溃之前有另一个奇怪的日志。

[] <<<< AVOutputDeviceDiscoverySession (FigRouteDiscoverer) >>>> -[AVFigRouteDiscovererOutputDeviceDiscoverySessionImpl outputDeviceDiscoverySessionDidChangeDiscoveryMode:]: Setting device discovery mode to DiscoveryMode_None (client: ECalligraphy)

自定义图像选取器类显然继承自UIImagePickerController 当我用[[ECPhotoPickerController alloc] init]初始化它时，它应该调用超类的初始化，因为我没有实现ECPhotoPickerController的初始化。

我对此次崩溃感到非常困惑。任何建议将不胜感激。

Answer 1

我最终找到了原因！
应在视图控制器开始之前指定sourceType 在iOS 11上加载。

这意味着，您应该在自定义视图控制器初始化期间设置sourceType的值，或者在加载前为实例执行此操作。

- (instancetype)init { // `initFromNibName` etc. depends on the way you initialize it.
    if (self = [super init]) {
        self.sourceType = UIImagePickerControllerSourceTypeCamera;
        self.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
        self.showsCameraControls = false;
        self.delegate = self;
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
}

或

- (void)showImagePicker {
    ECPhotoPickerController* vc = [[ECPhotoPickerController alloc] init];
    vc.sourceType = UIImagePickerControllerSourceTypeCamera;
    [self presentViewController:vc animated:true completion:nil];
}

UIImagePickerController与＆＃34; [UIViewController _setCameraOverlayView：]崩溃：无法识别的选择器＆＃34;在iOS 11上

1 个答案: