快速找到本视图的控制器

#import "UIView+ViewController.h"

@implementation UIView (ViewController)

- (UIViewController *)viewController{
   
    //用循环+类别判断 -> 查找视图所在控制器
   
    UIResponder *next = self.nextResponder;
   
    while (next != nil) {
       
        //2.判断响应者是否是控制器类型
        if ([next isKindOfClass:[UIViewController class]]) {
           
            UIViewController *root = (UIViewController *)next;
           
            return root;
        }
       
        //1.获取下一响应者
       
        next = next.nextResponder;
    }
   
    return nil;
}