kudians/ZBProject/Main/PageController/LPBaseVC.m

//
//  LPBaseVC.m
//  LPNavPageVCTest
//
//  Created by LPDev on 16/4/19.
//  Copyright © 2016年 anonymous. All rights reserved.
//

#import "LPBaseVC.h"

@interface LPBaseVC ()

@property (nonatomic, weak) UIImageView * contentLineImageView;

@end

@implementation LPBaseVC

- (void)viewDidLoad {

    [super viewDidLoad];
    
    self.contentLineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
}

- (void)viewWillAppear:(BOOL)animated {
    
    [super viewWillAppear:animated];
    
    _contentLineImageView.hidden = YES;
}

- (void)viewWillDisappear:(BOOL)animated {
    
    [super viewWillDisappear:animated];
    
    _contentLineImageView.hidden = NO;
}

// 隐藏导航栏下面的那直线
- (UIImageView *)findHairlineImageViewUnder:(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 findHairlineImageViewUnder:subview];
        
        if (imageView) {
            
            return imageView;
        }
    }
    
    return nil;
}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end