iOS自定义导航栏

天才第一步：
首先添加一个 CustomNaviController 继承自UINavigationController

@interface CustomNaviController : UINavigationController

@end

天才第二步：
重写push方法

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    if (self.childViewControllers.count > 0) {
        viewController.hidesBottomBarWhenPushed = YES;
        
        UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [backBtn setImage:[UIImage imageNamed:@"return"] forState:UIControlStateNormal];
        [backBtn setImage:[UIImage imageNamed:@"return"] forState:UIControlStateHighlighted];
        [backBtn addTarget:self action:@selector(OnClickBack) forControlEvents:UIControlEventTouchUpInside];
        [backBtn sizeToFit];
        backBtn.imageEdgeInsets = UIEdgeInsetsMake(0, -35, 0, 0);
        UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:backBtn];
        
        viewController.navigationItem.leftBarButtonItem = leftItem;
    }
    [super pushViewController:viewController animated:animated];

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

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