Progress of UIPageViewController

Question

I would like to receive updates from the uipageviewcontroller during the page scrolling process. I want to know the transitionProgress in %. (This value should update when t

Answer 1

At last I found out a solution, even if it is probably not the best way to do it:

I first add an observer on the scrollview like this:

// Get Notified at update of scrollview progress
NSArray *views = self.pageViewController.view.subviews;
UIScrollView* sW = [views objectAtIndex:0];
[sW addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:NULL];

And when the observer is called:

NSArray *views = self.pageViewController.view.subviews;
UIScrollView* sW = [views objectAtIndex:0];
CGPoint point = sW.contentOffset;

float percentComplete;
//iPhone 5
if([ [ UIScreen mainScreen ] bounds ].size.height == 568){
    percentComplete = fabs(point.x - 568)/568;

} else{
//iphone 4
    percentComplete = fabs(point.x - 480)/480;
}
NSLog(@"percentComplete: %f", percentComplete);

I'm very happy that I found this :-)