iOS 去除导航栏下面的黑线

在项目有时候需要去除掉导航栏下面的黑线，现在附上代码，供大家参考

@property (nonatomic, weak) UIImageView * lineView;

//1.视图加载完成获取到导航栏最下面的黑线- (void)viewDidLoad {    [super viewDidLoad];        //2.获取导航栏下面的黑线    self.lineView = [self getLineViewInNavigationBar:self.navigationController.navigationBar];    }

- (void)viewWillAppear:(BOOL)animated {    [super viewWillAppear:animated];    //3.视图将要显示时隐藏    self.lineView.hidden = YES;}- (void)viewWillDisappear:(BOOL)animated {    [super viewWillDisappear:animated];    //4.视图将要消失时取消隐藏    self.lineView.hidden = NO;}

//找到导航栏最下面黑线视图- (UIImageView *)getLineViewInNavigationBar:(UIView *)view {    if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {        return (UIImageView *)view;    }        for (UIView *subview in view.subviews) {        UIImageView *imageView = [self getLineViewInNavigationBar:subview];        if (imageView) {            return imageView;        }    }        return nil;}