• 刚开始学习 swift 一段时间，学习果然还是还是要不停地敲代码的啊，全部代码都写在导航控制器 UINavigationController 的类里面。先说下 swift 的整个控制器的侧滑返回实现
• swift
• 1，第一种实现方法

//        获取手势属性
        /*
        var count : UInt32 = 0
        let ivars = class_copyIvarList(UIGestureRecognizer.self, &count)!
        
        for i in 0..<count {
            let nameP = ivar_getName(ivars[Int(i)])!
            let name = String(cString: nameP)
            print(name)//打印出所有属性
        }
       free(ivars);
        */
//判断并获取 targets 的 action
       guard let targets = interactivePopGestureRecognizer!.value(forKey: "_targets") as? [NSObject] else{return}
        
        let targetObjc = targets[0]
        
        let target = targetObjc.value(forKey: "target")
//由于直接使用它的 action 会崩溃，所以自己需要重新构建一个 Selector，自定义一个手势
        let action = Selector(("handleNavigationTransition:"))
        
        let panGes = UIPanGestureRecognizer(target: target, action: action)
        
        view.addGestureRecognizer(panGes)

• 2，第二种实现方法

 interactivePopGestureRecognizer!.delegate = self as? UIGestureRecognizerDelegate
 object_setClass(interactivePopGestureRecognizer!.self, UIPanGestureRecognizer.classForCoder())

• OC 实现侧滑（实现其实和 swift 差不多）
• 1，第一种实现方法

    unsigned int count = 0;
    Ivar *ivars = class_copyIvarList([UIGestureRecognizer class], &count);
    //获取手势的属性变量
    for (int i = 0; i<count; i++) {
        
        NSString *str = [NSString stringWithCString:ivar_getName(ivars[(int)i]) encoding:NSUTF8StringEncoding];
        
        NSLog(@"%@",str);
    }    
    free(ivars);
    id targets = [self.interactivePopGestureRecognizer  valueForKey:@"_targets"];
    
    NSLog(@"%@",targets);
    id target = [targets[0] valueForKey:@"target"];
    //更具 target 获取 selector
    SEL selector = NSSelectorFromString(@"handleNavigationTransition:");
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:selector];
    [self.view addGestureRecognizer:pan];

• 2，第二种实现方法

    // 更换interactivePopGestureRecognizer的delegate为navigationController自己
    self.interactivePopGestureRecognizer.delegate = self;
    // 自带的边缘返回手势UIScreenEdgePanGestureRecognizer，但只负责edge部分。换成全屏的UIPanGestureRecognizer
    object_setClass(self.interactivePopGestureRecognizer, [UIPanGestureRecognizer class]);