runtime实现全屏pop手势

• 自定义 NavigationController 继承于系统 UINavigationController

• 导入头文件 #import

• NavigationController 中实现如下方法

  // OBJC
  - (void)viewDidLoad {
      [super viewDidLoad];
       
       // 取出系统pop手势的`target`和`action`
       NSArray *targetObjs = [self.interactivePopGestureRecognizer valueForKey:@"_targets"];
       id target = [targetObjs.firstObject valueForKey:@"target"];
       SEL sel = NSSelectorFromString(@"handleNavigationTransition:");
        
       UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:target action:sel];
       [self.view addGestureRecognizer:panGesture];
    
  }
  
  // swift
  override func viewDidLoad() {
      super.viewDidLoad()
    
      // 获取系统pop手势的target和action
      guard let targets = interactivePopGestureRecognizer?.value(forKey: "_targets") as? [NSObject] else { return }
      let targetObj = targets.first
      let target = targetObj?.value(forKey: "target")
      let action = Selector(("handleNavigationTransition:"))
    
      let panGesture = UIPanGestureRecognizer(target: target, action: action)
      view.addGestureRecognizer(panGesture)
    
  }
  

• runtime的使用

  - OBJC
        unsigned int outCount = 0;
        Ivar *ivars = class_copyIvarList([UIGestureRecognizer class], &outCount);
        
        unsigned int outCountMethod = 0;
        Method *methods = class_copyMethodList([UIGestureRecognizer class], &outCountMethod);
        
        for (unsigned int i = 0; i < outCount; i++) {
            Ivar ivar = ivars[i];
            NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
            NSLog(@"%@", key);
        }
  
        NSLog(@"==========");
  
        for (unsigned int i = 0; i < outCountMethod; i++) {
            Method method = methods[i];
            SEL sel = method_getName(method);
            NSString *selName = NSStringFromSelector(sel);
            NSLog(@"%@", selName);
        }
  
  - swift
        // 获取 UIGestureRecognizer 的属性列表
        var count: UInt32 = 0
        let ivars = class_copyIvarList(UIGestureRecognizer.self, &count)!
        for i in 0..