自定义导航栏继承自BaseNav

@interface PublicNavBar : UIView/** 返回按钮 */@property (weak, nonatomic) IBOutlet UIButton *backButton;/** 返回按钮宽度*/@property (weak, nonatomic) IBOutlet NSLayoutConstraint *backButtonWidth;/** 标题 */@property (weak, nonatomic) IBOutlet UILabel *titleLabel;/** 右一按钮（从右数起） */@property (weak, nonatomic) IBOutlet UIButton *rightButton;/** 右二按钮 */@property (weak, nonatomic) IBOutlet UIButton *rightOtherButton;@property (weak, nonatomic) IBOutlet NSLayoutConstraint *rightButtonWidth;@property (weak, nonatomic) IBOutlet UIImageView *backGroundImageView;- (instancetype)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        [self setup];    }    return self;}- (void)awakeFromNib{    [super awakeFromNib];    [self setup];}- (void)setup {        [_backButton setTitleColor:[UIColor color8]];    [_rightButton setTitleColor:[UIColor color8]];    [_rightOtherButton setTitleColor:[UIColor color8]];    _titleLabel.textColor = [UIColor color8];}