iOS 导航栏butto添加

添加左侧右侧button

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
    [btn addTarget:self action:@selector(myBtn:) forControlEvents:UIControlEventTouchUpInside];
    [btn setImage:[UIImage imageNamed:@"mx_btn_back_phone" ] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"mx_btn_back_phone" ] forState:UIControlStateHighlighted];
    btn.imageEdgeInsets = UIEdgeInsetsMake(0, -31, 0, 0);
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
    self.navigationItem.leftBarButtonItem = backItem;
    self.navigationItem.rightBarButtonItem = backItem;

随手笔记整理下！
✧(≖ ◡ ≖✿)