根据响应链传递在hitTest方法中返回接受事件的视图即可，在自定义的button中重写hitTest方法，其中view==nil表示当前点击的是超出button的子视图view区域，再通过遍历button的子视图subviews，找到其中的UIView即可。反过来UIView上覆盖UIButton，在UIView中重写hitTest方法，把button传进来查找

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *view = [super hitTest:point withEvent:event];
    if (view == nil) {
        for (UIView *subView in self.subviews) {
            CGPoint p = [subView convertPoint:point fromView:self];
            if (CGRectContainsPoint(subView.bounds, p)) {
                return self;
            }
        }
    }
    return view;
}

或者直接一点，把子view当做参数传进来查找，看点击区域是否在view上

@interface TempButton : UIButton

@property (nonatomic, strong) TempView *tempView;

@end

#import "TempButton.h"

@implementation TempButton

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *view = [super hitTest:point withEvent:event];
    if (view == nil) {
        CGPoint p = [self.tempView convertPoint:point fromView:self];
        if (CGRectContainsPoint(self.tempView.bounds, p)) {
            return self;
        }
    }
    return view;
}

@end