关于ios UIView中的UIButton不能点击按钮 的问题

.h文件

import 

@interface HUPrompt : UIView

.m文件

import "HUPrompt.h"

import "UIView+Layout.h"

@implementation HUPrompt

UIImageView *backView = [[UIImageView alloc] init];

backView.frame = self.frame;
 backView.image = _backImage;
 [self addSubview:backView];
 self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, label.bottom+23, 74, 32)];

self.button.isPercentSize = YES;
 self.button.backgroundColor = Btn_COLOR;
 [self.button setTitle:@"知道了" forState:UIControlStateNormal];
 [self.button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
 [self.button addTarget:self action:@selector(cancle1) forControlEvents:UIControlEventTouchUpInside];
 self.button.titleLabel.font = TextSize;
 self.button.layer.cornerRadius = 15;
 self.button.layer.masksToBounds = YES;
 [backView addSubview:self.button];
 self.button.isHorizontalCenter = YES;
 -(void)cancle1{

NSLog(@"sdfdsfds");
 }

然后我在uiviewController调用 能显示 frame是传进来了的 但是不能点击 没触发事件 我想是不是uiview中不能用addTarget这个方法啊