set UiContactCell contact to null when leaving the view to avoid memory leak

Classes/ContactsListTableView.h

@@ -30,5 +30,6 @@
 }
 - (void)loadData;
 - (void)loadSearchedData;
+- (void)removeAllContacts;
 
 @end

Classes/ContactsListTableView.m

@@ -67,6 +67,15 @@
 
 - (void)dealloc {
 	[[NSNotificationCenter defaultCenter] removeObserver:self];
+	[self removeAllContacts];
+}
+
+- (void)removeAllContacts {
+	for (NSInteger j = 0; j < [self.tableView numberOfSections]; ++j) {
+		for (NSInteger i = 0; i < [self.tableView numberOfRowsInSection:j]; ++i) {
+			[[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:j]] setContact:nil];
+		}
+	}
 }
 
 #pragma mark -

Classes/ContactsListView.m

@@ -150,6 +150,7 @@ static UICompositeViewDescription *compositeDescription = nil;
 
 - (void) viewWillDisappear:(BOOL)animated {
 	self.view = NULL;
+	[self.tableController removeAllContacts];
 }
 
 #pragma mark -

Classes/LinphoneUI/UIContactCell.m

@@ -53,6 +53,7 @@
 }
 
 - (void)dealloc {
+	self.contact = NULL;
 	[NSNotificationCenter.defaultCenter removeObserver:self];
 }