oc调整菜单栏按钮图片大小

  // 1 菜单栏按钮  方法1 ios11 设置菜单栏 右键 图片大小

    UIButton *menuBtn = [[UIButton alloc]initWithFrame:CGRectMake((UISCREEN_WIDTH – 40), 5, 30, 30)];

    [menuBtn.widthAnchor constraintEqualToConstant:30].active = YES;

    [menuBtn.heightAnchor constraintEqualToConstant:30].active = YES;

    //UIButton *menuBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [menuBtn setImage:[UIImage imageNamed:@”menu.png”] forState:UIControlStateNormal];

    [menuBtn addTarget:self action:@selector(menuBtnAction) forControlEvents:UIControlEventTouchUpInside];

    //menuBtn.frame = CGRectMake(0, 5, 20, 20);

    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:menuBtn];

    self.navigationItem.rightBarButtonItem  = backItem;