有没有办法改变页面指示器点的颜色 [英] Is there a way to change page indicator dots color

问题描述

我是 iphone 编程的新手，我正在尝试开发一个使用页面控制的应用程序.我的视图的背景颜色是白色，页面控制器默认也是白色的，这使得页面控件在我的视图中不可见，所以我更改了页面控件的背景颜色以使其可见.现在，视图出现修补和坏.有没有办法只更改页面控件的点颜色?

I am newbie to iphone programming, I am trying to develop an app which uses page control. My view's background color is white and page controllers default one is also white, which makes page control invisible on my view so I have changed the back ground color of page control to make is visible. Now, the view appears patched and bad. Is there a way to change just the dots color for page control?

提前致谢

推荐答案

我们自定义了 UIPageControl 以使用自定义图像作为页面指示器，我在下面列出了该类的内容...

We customized the UIPageControl to use a custom image for the page indicator, I have listed the guts of the class below...

GrayPageControl.h

GrayPageControl.h

@interface GrayPageControl : UIPageControl
{
    UIImage* activeImage;
    UIImage* inactiveImage;
}

GrayPageControl.m

GrayPageControl.m

-(id) initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];

    activeImage = [[UIImage imageNamed:@"active_page_image.png"] retain];
    inactiveImage = [[UIImage imageNamed:@"inactive_page_image.png"] retain];

    return self;
}

-(void) updateDots
{
    for (int i = 0; i < [self.subviews count]; i++)
    {
        UIImageView* dot = [self.subviews objectAtIndex:i];
        if (i == self.currentPage) dot.image = activeImage;
        else dot.image = inactiveImage;
    }
}

-(void) setCurrentPage:(NSInteger)page
{
    [super setCurrentPage:page];
    [self updateDots];
}

然后在视图控制器中我们就像普通的 UIPageControl 一样使用它

Then in the View Controller we just use it like a normal UIPageControl

IBOutlet GrayPageControl* PageIndicator;

在具有 GrayPageControl 的视图控制器中，我有一个链接到 GrayPageControl.ValueChanged 事件的 IBAction.

In the view controller that has the GrayPageControl I have an IBAction that is linked to the GrayPageControl.ValueChanged event.

-(IBAction) pageChanged:(id)sender
{
    int page = PageIndicator.currentPage;

    // update the scroll view to the appropriate page
    CGRect frame = ImagesScroller.frame;
    frame.origin.x = frame.size.width * page;
    frame.origin.y = 0;
    [ImagesScroller scrollRectToVisible:frame animated:YES];
}

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