私は次のことをしました:
 buttonPlaylistView = [[UIButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width *(urlList.count+1), 0, self.view.frame.size.width, self.view.frame.size.height)];
            buttonPlaylistView.tag = 0;
 UITapGestureRecognizer *doubleTap3 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
            [doubleTap3 setNumberOfTapsRequired:2];
            [buttonPlaylistView addGestureRecognizer:doubleTap3];
            [doubleTap3 release];
-(void) handleDoubleTap:(UITapGestureRecognizer *)sender{
    if(sender.state == UIGestureRecognizerStateEnded)
    int x = [sender tag];
    return;
}
しかし、私SIGAGRTはこの行に到達します:int x = [sender tag];言っています:
[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x61280b0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x61280b0'
今:問題は何ですか、これに対する解決策は何ですか?ありがとう