UIPageViewController that has UIPageControl with different dot colours

 Customise page control

  1. Create page control subclassing UIView
  2. Draw the coloured dots in - (void) drawRect:(CGRect) rect
  3. Control the touch events using - (void) touchesBegan:(NSSet *) touches withEvent:(UIEvent *) event
  4. Inform page view controller when user touch it using delegation.

Customise page view controller

  1. Override - (void) viewDidLayoutSubviews and search all the subviews and find the UIPageControl instance.
  2. Hide the UIPageControl instance and add the custom page control instance to its superview.
  3. Set the UIPageControl instance frame to custom page control.
  4. Bring the custom page control using [self.view bringSubviewToFront:pageControl];
  5. When custom page control informs you about the user touch then call the method - (void)setViewControllers:(nullable NSArray *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^ __nullable)(BOOL finished))completion; to move to right or left page.

Page view controller delegate

  1. Update custom control page dots/index using
    - (void) pageViewController:(COPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *) previousViewControllers transitionCompleted:(BOOL) completed
  2. This method - (void) pageViewController:(COPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *) pendingViewControllers will start when user swipes the page. What I did is maintained a variable that tells whether the page is still in transition, based on that I will allow the user interaction with custom page control.

 

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Add image to custom photo album

– (void) addAssetWithURL:(NSURL *) assetURL toPhotoAlbum:(NSString *) album
{
__block ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library assetForURL:assetURL
resultBlock:^(ALAsset *asset)
{
NSString *groupName = [[NSUserDefaults standardUserDefaults] objectForKey:@”groupURL”];
NSURL *groupURL = [[NSURL alloc] initWithString:groupName?groupName:@””];

[library groupForURL:groupURL
resultBlock:^(ALAssetsGroup *group)
{
NSString *groupName = [group valueForProperty:ALAssetsGroupPropertyName];

if ([album isEqualToString:groupName])
{
[group addAsset:asset];
}
else
{
__weak ALAssetsLibrary *lib = library;

[library addAssetsGroupAlbumWithName:album resultBlock:^(ALAssetsGroup *group)
{
NSString *groupName = [group valueForProperty:ALAssetsGroupPropertyName];
NSURL *groupURL = [group valueForProperty:ALAssetsGroupPropertyURL];
[[NSUserDefaults standardUserDefaults] setObject:groupURL.absoluteString forKey:@”groupURL”];

[lib enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
if ([album isEqualToString:groupName])
{
[group addAsset:asset];
}

} failureBlock:^(NSError *error)
{
}];

} failureBlock:^(NSError *error)
{
}];
}

} failureBlock:^(NSError *error)
{
}];

} failureBlock:^(NSError *error)
{
}];
}

– (void) addToPhotoAlbum:(NSString *) album sourceType:(UIImagePickerControllerSourceType) sourceType assetURL:(NSURL *) assetURL
{
if (sourceType == UIImagePickerControllerSourceTypePhotoLibrary)
{
[self addAssetWithURL:assetURL toPhotoAlbum:kAlbumName];
}
else
{
__block ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library writeImageToSavedPhotosAlbum:self.CGImage
orientation:(ALAssetOrientation)self.imageOrientation
completionBlock:^(NSURL *assetURL, NSError *error)
{
[self addAssetWithURL:assetURL toPhotoAlbum:album];
}];
}
}

Custom UITabbar