-(void)viewWillAppear:(BOOL)animated { //viewWillAppear中設置透明 [super viewWillAppear:animated]; [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; //用空圖片填充機位透明 [self.navigationBar setShadowImage:[UIImage new]];//naviBar底部的seperatorLine}-(void)viewDidDisappear:(BOOL)animated { //viewWillAppear中設置恢復 [super viewDidDisappear:animated]; [self.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault]; [self.navigationBar setShadowImage:shadowImage];}

barImageView = self.navigationController.navigationBar.subviews.firstObject;-(void)scrollViewDidScroll:(UIScrollView *)scrollView { CGFloat minAlphaOffset = - 64; CGFloat maxAlphaOffset = 200;  CGFloat offset = scrollView.contentOffset.y;  CGFloat alpha = (offset - minAlphaOffset) / (maxAlphaOffset - minAlphaOffset); _barImageView.alpha = alpha;}

[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;//黑色[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;//白色

-(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.navigationController.navigationBarHidden = YES;}-(void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; self.navigationController.navigationBarHidden = NO;}-(void)ys_initNavigationBar { self.navigationController.interactivePopGestureRecognizer.delegate = (id)self; // 保留右滑pop的手勢 _naviBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.width, 64)]; _naviBar.backgroundColor = [UIColor whiteColor]; [self.view addSubview:_naviBar];UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, _naviBar.height-0.5, self.view.width, 0.5)];line.backgroundColor = [UIColor colorForHex:@"f0f0f0"];[_naviBar addSubview:line];// 返回backButton = [UIButton buttonWithType:UIButtonTypeCustom];backButton.frame = CGRectMake(0, 20, 44, 44);[backButton addTarget:self action:@selector(goBack:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:backButton];// 標題naviLable = [[UIButton alloc] initWithFrame:CGRectMake(44, 20, self.view.width-44*2, 44)];naviLable.backgroundColor = [UIColor clearColor];naviLable.font = [UIFont systemFontOfSize:16];naviLabel.textAlignment = NSTextAlignmentCenter;[self.view addSubview: naviLable];}-(void)scrollViewDidScroll:(UIScrollView *)scrollView { //navigationBar change CGFloat minAlphaOffset = 0; CGFloat maxAlphaOffset = 40; CGFloat offset = scrollView.contentOffset.y; CGFloat alpha = (offset - minAlphaOffset) / (maxAlphaOffset - minAlphaOffset); _naviBar.alpha = alpha; naviLabel.alpha = alpha;}