Ios UIImageController delegate undeclared error

Question

I know this question asked several times on this. but I follow both method to solved undeclared identifier self.

I declared @interface in .m class

Answer 1

I believe you are facing these errors because you wrote it inside a C++/C method. If you write it inside a objective-c method, your problem should get resolved.

- (void)cameraCapture {
    UIImagePickerController *picker = [UIImagePickerController new];
    picker.delegate = self;
}

You can write it in a C/C++ method in the following way.

void cameraCapture(void* object) {

    YourCurrentViewController *vc = (__bridge YourCurrentViewController *)object;

    UIImagePickerController *picker = [UIImagePickerController new];
    picker.delegate = vc;
}

Call it from a Objective-C method in the following way.

CameraCapture(1, "imgName", (__bridge void *)self);

Calling a Objective-C method from C/C++ method.

void CameraCapture(long cCameraClient, const char *imgName, void* object) {

    SATController *vc = (__bridge SATController *)object;
    UIImagePickerController *picker = [UIImagePickerController new];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.allowsEditing = YES;

    [self presentModalViewController:picker animated:YES];
}

Also, you can't directly access self from a C++ method. You need to pass it to the function. That's the reason for the input void *object. A void* is a pointer that has no associated data type with it. It can hold address of any type and can be typecasted to any type.