UIImageView设置手势无效

在给UIImageView添加手势时，发现不起作用，最终发现是由于我没有设置

User Interaction Enabled和Multiple Touch

NSArray *views = [[NSBundle
mainBundle] loadNibNamed:@"view_register_top"
owner:self
options:nil];

UIView *topView = views.firstObject;

CGRect tframe = CGRectMake(topView.frame.origin.x, statusHeight+navHeight, topView.frame.size.width,topView.frame.size.height);

topView.frame = tframe;

UIImageView *imgHeader = (UIImageView *)[topView
viewWithTag:1];

//创建手势

UILongPressGestureRecognizer *tapImgHeader = [[UILongPressGestureRecognizer
alloc]
initWithTarget:self
action:@selector(headImageClicked:)];

tapImgHeader.minimumPressDuration =
1;

//添加手势

[imgHeader
addGestureRecognizer:tapImgHeader];

[self.view
addSubview:topView];

}

-(void) headImageClicked:(UILongPressGestureRecognizer*)recognizer{

NSLog(@"000000000");

}

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