> On Aug 18, 2015, at 5:19 PM, Quincey Morris
> <quinceymor...@rivergatesoftware.com> wrote:
>
> But, in my own defense, I was looking for verification first that the
> mechanism is safe in 100% pure Swift. The next thing to verify is whether
> it’s safe with an @objc base class in Swift. Only if both those things are
> safe does it make any sense to wonder if an Obj-C base class is safe.
>
> However, the test you did doesn’t give much cause for optimism. I suppose
> *selectors* would have to be namespaced to solve the problem for the Obj-C
> runtime, wouldn’t it? For compatibility reasons, that seems unlikely, which
> makes it unlikely that this problem will ever be solved for Cocoa frameworks.
Hey, you know what *does* work? Going back to the original test:
MyBaseClass.h:
#import <Foundation/Foundation.h>
@interface MyBaseClass : NSObject
- (void)foo;
@end
MyBaseClass.m (initially):
@implementation MyBaseClass
- (void)foo {
fprintf(stderr, "BOOM!\n");
}
@end
App code:
import MyFramework
class MyClass: MyBaseClass {
@nonobjc func bar() {
print("BLEAH!")
}
}
let obj = MyClass()
obj.foo()
Output:
BOOM!
MyBaseClass.m changed to:
#import "MyBaseClass.h"
@implementation MyBaseClass
- (void)foo {
fprintf(stderr, "BOOM!\n");
[self bar];
}
- (void)bar {
fprintf(stderr, "It actually succeeded at Not Being Seen\n");
}
@end
Output without recompiling:
BOOM!
It actually succeeded at Not Being Seen
Output after recompiling the app:
BOOM!
It actually succeeded at Not Being Seen
And reverting MyBaseClass.m to the original and not recompiling the app:
BOOM!
So, if you declare all your new methods as @nonobjc and the base class remains
written in Objective-C, any new private method added to the base class will be
concealed extremely well.
However, we happen to know, it's in the water barrel. (“BOOM!”)
Charles
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