1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// 27 february 2014
package ui
import (
"fmt"
"unsafe"
)
// #cgo LDFLAGS: -lobjc -framework Foundation
// #include <stdlib.h>
// #include "objc_darwin.h"
// /* because cgo doesn't like Nil */
// Class NilClass = Nil;
import "C"
var (
_NSObject_Class = C.object_getClass(_NSObject)
)
func makeDelegateClass(name string) (C.Class, error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
c := C.objc_allocateClassPair(_NSObject_Class, cname, 0)
if c == C.NilClass {
return C.NilClass, fmt.Errorf("unable to create Objective-C class %s; reason unknown", name)
}
C.objc_registerClassPair(c)
return c, nil
}
// according to errors spit out by cgo, C function pointers are unsafe.Pointer
func addDelegateMethod(class C.Class, sel C.SEL, imp unsafe.Pointer) error {
// maps to void (*)(id, SEL, id)
ty := []C.char{'v', '@', ':', '@', 0}
// clas methods get stored in the metaclass; the objc_allocateClassPair() docs say this will work
// metaclass := C.object_getClass(C.id(unsafe.Pointer(class)))
// we're adding instance methods, so just class will do
ok := C.class_addMethod(class,
sel,
C.IMP(imp),
&ty[0])
if ok == C.BOOL(C.NO) {
// TODO get function name
return fmt.Errorf("unable to add selector %v/imp %v (reason unknown)", sel, imp)
}
return nil
}
|
