iOS 利用KVO和KVC解决SDCycleScrollView功能缺陷

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SDCycleScrollView使用起来非常便利，可能一些小细节会自己的需求不符，在不修改源代码的情况下项目中做了调整来满足UI需求，记录下一下。

解决分页控件不能靠右问题

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[[self.adScrollView valueForKeyPath:@"_pageControl"] addObserver:self forKeyPath:@"hidden" options:NSKeyValueObservingOptionNew context:nil];
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    if([keyPath isEqualToString:@"hidden"]) {
        UIControl *pageControl = [self.adScrollView valueForKeyPath:@"_pageControl"];
        CGRect frame = pageControl.frame;
        frame.origin.x = 15;
        pageControl.frame = frame;
    }
}
// 注销监听
- (void)dealloc{
    [[self.adScrollView valueForKeyPath:@"_pageControl"] removeObserver:self forKeyPath:@"hidden"];
}

解决背景图片不能铺满问题

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UIImageView *backgroundImageView = [cycleScrollView valueForKeyPath:@"_backgroundImageView"];
backgroundImageView.contentMode = UIViewContentModeScaleToFill;