iOS-自定义NavigationItem返回按钮【pop返回按钮】

在用navigationVC时，返回按钮有时候不想用系统的，这里用继承的方式把按钮替换了，同时也可以实现系统的右滑返回，很简单；

1.创建基类 BasePopViewController

创建一个用于替换系统返回按钮基类的 BasePopViewController : UIViewController；

BasePopViewController.m

#import "BasePopViewController.h"

@interface BasePopViewController ()

@end

@implementation BasePopViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setNavigationItemBackButton];
    self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    if (self.navigationController.viewControllers.count > 1) {
        self.navigationController.interactivePopGestureRecognizer.enabled = YES;
    }else{
        self.navigationController.interactivePopGestureRecognizer.enabled = NO;
    }
}

/**
 自定义返回按钮
 */
- (void)setNavigationItemBackButton{
    if (self.navigationController.viewControllers.count > 1) {
        
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.frame = CGRectMake(0, 0, 40, 44);
        btn.adjustsImageWhenHighlighted = NO;
        [btn setImage:[UIImage imageNamed:@"back_off"] forState:UIControlStateNormal];
        ///靠左
        btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        [btn setImageEdgeInsets:UIEdgeInsetsMake(0, -10, 0, 0)];
        [btn addTarget:self action:@selector(popBackButtonAction) forControlEvents:UIControlEventTouchUpInside];
        UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithCustomView:btn];
        self.navigationItem.leftBarButtonItems = @[item];
    }
}

/**
 返回按钮事件
 */
- (void)popBackButtonAction {
    [self.navigationController popViewControllerAnimated:YES];
}
#pragma mark - 下面是设置的状态栏颜色，可忽略
-(UIStatusBarStyle)preferredStatusBarStyle{
    ///这里设置白色
    return UIStatusBarStyleLightContent;
}
-(BOOL)prefersStatusBarHidden{
    return NO;
}
@end