From 2fcb1d49a0be54a0d43a4984e6e50e0a2d8d77f9 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Mon, 21 Mar 2011 03:35:20 -0700
Subject: [PATCH] Work around stupid 2.x UINavigationController behavior.

---
 MobileCydia.mm  | 22 ++++++++++++++++++++++
 iPhonePrivate.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/MobileCydia.mm b/MobileCydia.mm
index 41cc4e78..dd7b14ac 100644
--- a/MobileCydia.mm
+++ b/MobileCydia.mm
@@ -6747,6 +6747,20 @@ bool DepSubstrate(const pkgCache::VerIterator &iterator) {
 
 @implementation CYTabBarController
 
+- (void) didReceiveMemoryWarning {
+    [super didReceiveMemoryWarning];
+
+    // presenting a UINavigationController on 2.x does not update its transitionView
+    // it thereby will not allow its topViewController to be unloaded by memory pressure
+    if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
+        UIViewController *selected([self selectedViewController]);
+        for (UINavigationController *controller in [self viewControllers])
+            if (controller != selected)
+                if (UIViewController *top = [controller topViewController])
+                    [top unloadView];
+    }
+}
+
 - (void) setUnselectedViewController:(UIViewController *)transient {
     if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
         if (transient != nil) {
@@ -6786,6 +6800,14 @@ bool DepSubstrate(const pkgCache::VerIterator &iterator) {
 - (void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
     if ([self unselectedViewController])
         [self setUnselectedViewController:nil];
+
+    // presenting a UINavigationController on 2.x does not update its transitionView
+    // if this view was unloaded, the tranitionView may currently be presenting nothing
+    if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iPhoneOS_3_0) {
+        UINavigationController *navigation((UINavigationController *) viewController);
+        [navigation pushViewController:[[[UIViewController alloc] init] autorelease] animated:NO];
+        [navigation popViewControllerAnimated:NO];
+    }
 }
 
 - (NSArray *) navigationURLCollection {
diff --git a/iPhonePrivate.h b/iPhonePrivate.h
index 788c3c51..8cc997a1 100644
--- a/iPhonePrivate.h
+++ b/iPhonePrivate.h
@@ -296,6 +296,7 @@ typedef enum {
 
 @interface UIViewController (Apple)
 - (void) _updateLayoutForStatusBarAndInterfaceOrientation;
+- (void) unloadView;
 @end
 
 @interface UIWindow (Apple)
-- 
2.45.2