UIPageControl不适用于IOS7中的UIImageView

Question

在我努力升级我的应用程序以支持IOS7时,我发现UIPageControl它不支持UIImageView.他们改变了它.

我是子类化UIPageControl,以便将自定义圈子改为常规圈子(附上示例)

我的班级是:

- (id)initWithFrame:(CGRect)frame 
{
    // if the super init was successfull the overide begins.
    if ((self = [super initWithFrame:frame])) 
    { 
        // allocate two bakground images, one as the active page and the other as the inactive
        activeImage = [UIImage imageNamed:@"active_page_image.png"];
        inactiveImage = [UIImage imageNamed:@"inactive_page_image.png"];
    }
    return self;
}

// Update the background images to be placed at the right position
-(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;
    }
}

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

现在在IOS7中我收到以下错误:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setImage:]: unrecognized selector sent to instance 0xe02ef00'

并且在调查之后我明白以下代码会导致错误:

UIImageView* dot = [self.subviews objectAtIndex:i];
if (i == self.currentPage) dot.image = activeImage;
    else dot.image = inactiveImage;

我检查了子视图,发现它是UIView而不是UIImageView.可能苹果改变了一些东

知道怎么解决吗？

Answer 1

看起来他们将子视图更改为标准UIViews.我设法解决这个问题:

for (int i = 0; i < [self.subviews count]; i++)
{
    UIView* dotView = [self.subviews objectAtIndex:i];
    UIImageView* dot = nil;

    for (UIView* subview in dotView.subviews)
    {
        if ([subview isKindOfClass:[UIImageView class]])
        {
            dot = (UIImageView*)subview;
            break;
        }
    }

    if (dot == nil)
    {
        dot = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, dotView.frame.size.width, dotView.frame.size.height)];
        [dotView addSubview:dot];
    }

    if (i == self.currentPage)
    {
        if(self.activeImage)
            dot.image = activeImage;
    }
    else
    {
         if (self.inactiveImage)
             dot.image = inactiveImage;
    }
}