IDE: VS 2015
Version: 8.3.94.2001 (I can’t debug iOS app on newer beta version)
Target (If relevant): iOS + C#
Description:
I observed this issue when I was doing unit tests, in which I use C# delegates a lot. The output window prints many errors and the error looks like:
objc[1711]: __weak variable at 0x7fff574331b8 holds 0x7fc102caee48 instead of 0x7fc102cac8c0. This is probably incorrect use of objc_storeWeak() and objc_loadWeak(). Break on objc_weak_error to debug.
(the source code: https://opensource.apple.com/source/objc4/objc4-646/runtime/objc-weak.mm)
Finally I’m able to build a simple demo to reproduce it. It seems like the implementation of “delegate” on iOS has something wrong.
IOSApp1.zip (107.0 KB)
public class TestClass {
public delegate int Comparer(object a, object b);
public TestClass() {
sort(test); // this will cause that objc_weak_error
}
public int test(object a, object b) {
return 0;
}
public void sort(Comparer comparer) {
}
public override void dealloc() {
NSLog("dealloc TestClass!");
// After this dealloc, the output window will always print an error info:
// objc[1711]: __weak variable at 0x7fff574331b8 holds 0x7fc102caee48 instead of 0x7fc102cac8c0. This is probably incorrect use of objc_storeWeak() and objc_loadWeak(). Break on objc_weak_error to debug.
}
}
[UIApplicationMain, IBObject]
class AppDelegate : IUIApplicationDelegate {
public BOOL application(UIApplication application) didFinishLaunchingWithOptions(NSDictionary launchOptions) {
var window = new UIWindow(UIScreen.mainScreen().bounds);
window.rootViewController = new UIViewController withNibName(null) bundle(null);
window.makeKeyAndVisible();
// create & destroy immediately
new TestClass();
return true;
}
...
