essayer cette
UIButton *chatButton = [UIButton buttonWithType:UIButtonTypeCustom];
[chatButton setImage:[UIImage imageNamed:@"list.png"] forState:UIControlStateNormal];
[chatButton addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
chatButton.frame = (CGRect) {
.size.width = 30,
.size.height = 35,
};
UIBarButtonItem *barBackButton= [[UIBarButtonItem alloc] initWithCustomView:chatButton];
[navigationItem setLeftBarButtonItem:barBackButton];
NSArray *barItemArray = [[NSArray alloc]initWithObjects:navigationItem,nil];
[navigationBar setItems:barItemArray];
Merci, très utile. – Adhamox