UIScrollView滚动条颜色?

[scrollView1 setBackgroundColor:[UIColor blackColor]];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;

两个UIScrollView指示器都是UIScrollView的子视图。所以,我们可以 访问UIScrollView的子视图并更改子视图的属性。

1.添加UIScrollViewDelegate

@interface ViewController : UIViewController<UIScrollViewDelegate>
@end

-(void)scrollViewDidScroll:(UIScrollView *)scrollView1
{
    //get refrence of vertical indicator
    UIImageView *verticalIndicator = ((UIImageView *)[scrollView.subviews objectAtIndex:(scrollView.subviews.count-1)]);
    //set color to vertical indicator
    [verticalIndicator setBackgroundColor:[UIColor redColor]];


    //get refrence of horizontal indicator
    UIImageView *horizontalIndicator = ((UIImageView *)[scrollView.subviews objectAtIndex:(scrollView.subviews.count-2)]);
    //set color to horizontal indicator
    [horizontalIndicator setBackgroundColor:[UIColor blueColor]];
}

Note:- Because 每次滚动时,这些指示器都会更新 (指重置为默认值)。所以,我们把这个代码放在scrollViewDidScroll中

//ScrollView Deleagate
    func scrollViewDidScroll(scrollView: UIScrollView){
        let verticalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 1)] as! UIImageView)
        verticalIndicator.backgroundColor = UIColor.redColor()


        let horizontalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 2)] as! UIImageView)
        horizontalIndicator.backgroundColor = UIColor.blueColor()
    }