iOS navigation （pop）返回按钮点击提示框

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想了一段时间，还是通过博客来记录自己开发学习的过程，也让自己坚持学习，坚持进步
想下载源码的猛戳这里
本文章主要讲的是，点击系统自带的navigation返回按钮，弹出AlertView，点击确认后，才返回上一个页面，如图所示效果图

下面是第二个界面.m的代码,其中-(void)alertView是在.h中公开的方法，方便在NaviViewController这个类中调用

#import "ViewControllerB.h"@interface ViewControllerB ()@end@implementation ViewControllerB- (void)viewDidLoad {    [super viewDidLoad];    self.title = @"第二页";}-(void)alertView{    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"返回" message:@"你愿意返回吗" preferredStyle:UIAlertControllerStyleAlert];    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];    UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        [self.navigationController popViewControllerAnimated:YES];    }];    [alertVC addAction:cancelAction];    [alertVC addAction:sureAction];    [self presentViewController:alertVC animated:YES completion:nil];}

下面是NaviViewController这个类，继承于UINavigationController，主要在这个类中判断navigation自带的back按钮的点击事件，这里是点击back后弹出alertView，废话不多说，如下代码

#import "NaviViewController.h"#import "ViewControllerB.h"@interface NaviViewController ()<UIGestureRecognizerDelegate, UINavigationBarDelegate>//注意此类在appDelegate方法里面进行配置@end@implementation NaviViewController-(BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item{    UIViewController *vc = [self.viewControllers lastObject];    if ([vc isKindOfClass:[ViewControllerB class]]) {        [(ViewControllerB *)vc alertView];        for (UIView *subView in [vc.navigationController.navigationBar subviews]) {//保证取消后左箭头颜色不变            if ([NSStringFromClass([subView class]) isEqualToString:@"_UINavigationBarBackIndicatorView"]) {                [UIView animateWithDuration:0.25 animations:^{                    subView.alpha = 1;                }];            }        }        return NO;    }    return YES;}@end

对了在appDelegate中也需要进行配置

@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {   _window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];    _window.backgroundColor = [UIColor whiteColor];    [_window makeKeyAndVisible];    //注意NaviViewController是自己写得类    NaviViewController *navi = [[NaviViewController alloc]initWithRootViewController:[ViewController new]];    navi.navigationBar.backgroundColor = [UIColor blueColor];    _window.rootViewController = navi;    return YES;}

当然这里没有静止手势右滑返回上一界面，需要这功能的自行百度

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