Add missing Vision API

Fixes #755.

Author: madsmtm

framework-crates/objc2-vision/Cargo.modified.toml

@@ -0,0 +1,14 @@
+[features]
+VNObservation = [
+    "objc2-foundation/NSArray",
+    "objc2-foundation/NSData",
+    "objc2-foundation/NSDictionary",
+    "objc2-foundation/NSError",
+    "objc2-foundation/NSIndexPath",
+    "objc2-foundation/NSIndexSet",
+    "objc2-foundation/NSObject",
+    "objc2-foundation/NSRange", # Added
+    "objc2-foundation/NSString",
+    "objc2-foundation/NSUUID",
+    "objc2-foundation/NSValue",
+]

framework-crates/objc2-vision/Cargo.toml

@@ -18,6 +18,8 @@ extern crate std;
 mod generated;
 #[allow(unused_imports, unreachable_pub)]
 pub use self::generated::*;
+#[cfg(feature = "VNObservation")]
+mod observation;
 
 #[allow(unused)]
 pub(crate) type OSType = u32;

framework-crates/objc2-vision/src/lib.rs

@@ -0,0 +1,23 @@
+#![allow(non_snake_case)]
+use objc2::extern_methods;
+use objc2::rc::Retained;
+use objc2_foundation::{NSError, NSRange};
+
+use crate::{VNRecognizedText, VNRectangleObservation};
+
+impl VNRecognizedText {
+    extern_methods!(
+        /// Calculate the bounding box around the characters in the range of
+        /// the string.
+        ///
+        /// The bounding boxes are not guaranteed to be an exact fit around
+        /// the characters and are purely meant for UI purposes and not for
+        /// image processing.
+        #[unsafe(method(boundingBoxForRange:error:_))]
+        #[unsafe(method_family = none)]
+        pub unsafe fn boundingBoxForRange_error(
+            &self,
+            range: NSRange,
+        ) -> Result<Retained<VNRectangleObservation>, Retained<NSError>>;
+    );
+}