Function UIGraphicsBeginPDFContextToFile 

pub unsafe extern "C-unwind" fn UIGraphicsBeginPDFContextToFile(
    path: &NSString,
    bounds: CGRect,
    document_info: Option<&NSDictionary>,
) -> bool

Available on crate features UIGraphics and objc2-core-foundation only.

Safety

document_info generic should be of the correct type.