快速找到本视图的控制器

#import "UIView+ViewController.h"

@implementationUIView (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:[UIViewControllerclass]]) {
           
            UIViewController*root = (UIViewController*)next;
           
            returnroot;
        }
       
        //1.获取下一响应者
       
        next = next.nextResponder;
    }
   
    return nil;
}