jixin_new/shiku_im/ClassesNew/MainClass/XMGNavigationViewController.m

//
//  XMGNavigationViewController.m
//  备课-百思不得姐
//
//  Created by MJ Lee on 15/6/15.
//  Copyright © 2015年 小码哥. All rights reserved.
//

#import "XMGNavigationViewController.h"

@interface XMGNavigationViewController ()

@end

@implementation XMGNavigationViewController

+ (void)initialize
{
    UIImage *bg = [UIImage imageNamed:@"navigationbarBackgroundWhite4"];
    
    UINavigationBar *bar = [UINavigationBar appearance];
//    [bar setTintColor:[UIColor blackColor]];
    [bar setBackgroundImage:bg forBarMetrics:UIBarMetricsDefault];
    [bar setTitleTextAttributes:@{NSFontAttributeName : [UIFont boldSystemFontOfSize:20]}];
    
}
- (void)viewDidLoad{
    [super viewDidLoad];
    
    self.interactivePopGestureRecognizer.delegate= (id)self;
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
                 self.interactivePopGestureRecognizer.enabled = NO;
      }
    if (self.childViewControllers.count) {
        viewController.hidesBottomBarWhenPushed = YES;
      
        UIButton *button = [[UIButton alloc] init];
        [button setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];
        [button setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];
        //button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        //[button setTitle:@"返回" forState:UIControlStateNormal];
        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
        [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
        button.bounds = CGRectMake(0, 0, 44, 44);
        //button.contentEdgeInsets = UIEdgeInsetsMake(0, -5, 0, 0);
        button.titleLabel.font = [UIFont systemFontOfSize:15];
        viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    }
    
    [super pushViewController:viewController animated:animated];
}

- (void)back
{
    [self popViewControllerAnimated:YES];
}
 

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        navigationController.interactivePopGestureRecognizer.enabled = YES;
    }
    
    if (navigationController.viewControllers.count == 1) {
        navigationController.interactivePopGestureRecognizer.enabled = NO;
    }
}
@end