9、为UIImageView添加单击事件：

p_w_picpathView.userInteractionEnabled = YES;

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourHandlingCode:)];

[p_w_picpathView addGestureRecognizer:singleTap];