1.给UIView添加一个分类Category

• 在.h文件中

#import <UIKit/UIKit.h>

//UIView找下一响应者,直到找到控制器方法


@interface UIView (ViewController)

- (UIViewController *)viewContoller;

@end

• 在.m文件中

#import "UIView+ViewController.h"

@implementation UIView (ViewController)

- (UIViewController *)viewContoller {

    UIResponder *next = self.nextResponder;
    
    do {
        if ([next isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)next;
        }
        
        next = next.nextResponder;
        
    } while (next != nil);

    return nil;
}

@end