统一设置导航栏返回按钮

XMGNavigationViewController.m

#import "XMGNavigationViewController.h"

@interface XMGNavigationViewController ()

@end

@implementation XMGNavigationViewController
+ (void)load
{
    UINavigationBar *navBar = [UINavigationBar appearanceWhenContainedIn:self, nil];
    
    // 只要是通过模型设置,都是通过富文本设置
    // 设置导航条标题 => UINavigationBar
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
    attrs[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20];
    [navBar setTitleTextAttributes:attrs];
    
    // 设置导航条背景图片
    [navBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault];
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.childViewControllers.count > 0) { // 非根控制器
        
        // 设置返回按钮,只有非根控制器
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithimage:[UIImage imageNamed:@"navigationButtonReturn"] highImage:[UIImage imageNamed:@"navigationButtonReturnClick"]  target:self action:@selector(back) title:@"返回"];
    }
    
    // 真正在跳转
    [super pushViewController:viewController animated:animated];
    
}
- (void)back
{
    [self popViewControllerAnimated:YES];
}
@end

UIBarButtonItem+Item.m

import "UIBarButtonItem+Item.h"

@implementation UIBarButtonItem (Item)

+ (UIBarButtonItem *)backItemWithimage:(UIImage *)image highImage:(UIImage *)highImage target:(id)target action:(SEL)action title:(NSString *)title{
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [backButton setTitle:title forState:UIControlStateNormal];
    [backButton setImage:image forState:UIControlStateNormal];
    [backButton setImage:highImage forState:UIControlStateHighlighted];
    [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
    [backButton sizeToFit];
    backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);
    [backButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    
    return  [[UIBarButtonItem alloc] initWithCustomView:backButton];
}

@end