Merge pull request opencv#24454 from komakai:refactorObjcRange

Refactor ObjectiveC Range class opencv#24454

### Pull Request Readiness Checklist

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch

Fix for build issue in opencv#24405

modules/core/misc/objc/common/Range.h

@@ -25,13 +25,20 @@ CV_EXPORTS @interface Range : NSObject
 
 @property int start;
 @property int end;
+#ifdef __cplusplus
+@property(readonly) cv::Range& nativeRef;
+#endif
 
 #pragma mark - Constructors
 
 - (instancetype)init;
 - (instancetype)initWithStart:(int)start end:(int)end;
 - (instancetype)initWithVals:(NSArray<NSNumber*>*)vals;
 
+#ifdef __cplusplus
++ (instancetype)fromNative:(cv::Range&)range;
+#endif
+
 #pragma mark - Methods
 
 /**

modules/core/misc/objc/common/Range.m → modules/core/misc/objc/common/Range.mm

@@ -1,12 +1,34 @@
 //
-//  Range.m
+//  Range.mm
 //
 //  Created by Giles Payne on 2019/10/08.
 //
 
 #import "Range.h"
 
-@implementation Range
+@implementation Range {
+    cv::Range native;
+}
+
+- (int)start {
+    return native.start;
+}
+
+- (void)setStart:(int)val {
+    native.start = val;
+}
+
+- (int)end {
+    return native.end;
+}
+
+- (void)setEnd:(int)val {
+    native.end = val;
+}
+
+- (cv::Range&)nativeRef {
+    return native;
+}
 
 - (instancetype)init {
     return [self initWithStart:0 end: 0];
@@ -29,6 +51,10 @@ - (instancetype)initWithVals:(NSArray<NSNumber*>*)vals {
     return self;
 }
 
++ (instancetype)fromNative:(cv::Range&)range {
+    return [[Range alloc] initWithStart:range.start end:range.end];
+}
+
 - (void)set:(NSArray<NSNumber*>*)vals {
     self.start = (vals != nil && vals.count > 0) ? vals[0].intValue : 0;
     self.end = (vals != nil && vals.count > 1 ) ? vals[1].intValue : 0;

modules/core/misc/objc/gen_dict.json

@@ -167,7 +167,9 @@
             "from_cpp": "[Point3i fromNative:%(n)s]"
         },
         "Range": {
-            "objc_type": "Range*"
+            "objc_type": "Range*",
+            "to_cpp": "%(n)s.nativeRef",
+            "from_cpp": "[Range fromNative:%(n)s]"
         },
         "Rect": {
             "objc_type": "Rect2i*",