一直觉得微信的导航栏穿透效果很好看
所以找了点方法模仿一下
直接上代码

NSShadow *shadow = [[NSShadow alloc] init];
    shadow.shadowColor = [UIColor colorWithWhite:0.0f alpha:1.0f];
    shadow.shadowOffset = CGSizeMake(0, 0);
    [[UIApplication sharedApplication]registerNotifications];
    [[UINavigationBar appearance] setTitleTextAttributes:@{
                                                           NSForegroundColorAttributeName: [UIColor whiteColor],
                                                           NSShadowAttributeName: shadow,
                                                           NSFontAttributeName: [UIFont fontWithName:@"Arial-BoldMT" size:17.0f]
                                                           }];
    
    [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
    [[UINavigationBar appearance] setBarTintColor:[UIColor appNavigationBarColor]];
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
    
       [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarOrientationChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];

直接加一个shadow

方法二

let blurBackView = UIView()
blurBackView.frame = CGRect(x: 0, y: -20, width: kScreenW, height: 64)
let gradintLayer = CAGradientLayer()
gradintLayer.frame = CGRect(x: 0, y: 0, width: kScreenW, height: 64)
gradintLayer.colors = [
    UIColor.hexInt(0x040012).withAlphaComponent(0.76).cgColor,
    UIColor.hexInt(0x040012).withAlphaComponent(0.28).cgColor
]
gradintLayer.startPoint = CGPoint(x: 0, y: 0)
gradintLayer.endPoint = CGPoint(x: 0, y: 1.0)
blurBackView.layer.addSublayer(gradintLayer)
blurBackView.isUserInteractionEnabled = false
blurBackView.alpha = 0.5

// 设置导航栏样式
navigationBar.barStyle = .black
navigationBar.insertSubview(blurBackView, at: 0)

第三种

UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, bgImgView.frame.size.width*0.5, bgImgView.frame.size.height)];
toolbar.barStyle = UIBarStyleBlackTranslucent;
[bgImgView addSubview:toolbar];

第四种

UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
effectView.frame = CGRectMake(0, 0, bgImgView.frame.size.width*0.5, bgImgView.frame.size.height);