截取系统返回给自定义手势(全屏返回)

在自定义的navVC中,用kvc的方式获取到系统返回手势的target和action 赋值给自定义的pan手势 的target 和action,pan手势就实现了系统手势一样的功能

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];
    
    UIGestureRecognizer *gesture = self.interactivePopGestureRecognizer;
//    NSLog(@"gesture: %@", gesture);
    UIView *navPopView = gesture.view;
    
    id targets = [gesture valueForKey:@"_targets"];
//    NSLog(@"targets: %@", targets);
    //获取手势
    id targetObjc = [targets firstObject];
//    NSLog(@"targetObjc: %@", targetObjc);
    //获取手势的target
    id target = [targetObjc valueForKey:@"target"];
//    NSLog(@"target: %@", target);
//直接崩溃
    {
//    id action = [targetObjc valueForKey:@"action"];
//    NSLog(@"action: %@", action);
    }
    //获取手势绑定的方法SEL
    SEL sel = NSSelectorFromString(@"handleNavigationTransition:");
//    NSLog(@"sel: %p", &sel);
    //将系统手势返回的target和SEL绑定到自定义的pan手势上
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:target action:sel];
    [navPopView addGestureRecognizer:pan];
    NSLog(@"---%s----%@", __PRETTY_FUNCTION__, [navPopView valueForKey:@"gestureRecognizers"]);
    
}