ios滚动效果

实现了顶部滑动， - (void)tapClick:(UITapGestureRecognizer *)tap { [UIView animateWithDuration:0.3 animations:^{ _lineView.frame = CGRectMake(tap.view.frame.origin.x, 47, tap.view.frame.size.width, 2); }]; //文字颜色 UILabel *label = (UILabel *)tap.view; label.textColor