Customizing UIPageControl dotImages.

CustomPageControl.m

#import "CustomPageControl.h"

@interface CustomPageControl ()

#pragma mark - View Properties
@property (nonatomic,strong) UIImage *selectedImage;
@property (nonatomic,strong) UIImage *normalImage;

@end

@implementation CustomPageControl

#pragma mark - View Methods
- (void)setCurrentPage:(NSInteger)currentPage {
    [super setCurrentPage:currentPage];
    [self updateDots];
}

#pragma mark - Layout Configuration
- (void)updateViewForSelectedImage:(UIImage *)selectedImage normalImage:(UIImage *)normalImage {
    if (!self.selectedImage) {
        self.selectedImage = selectedImage;
    }
    if (!self.normalImage) {
        self.normalImage = normalImage;
    }
    
    for (int i = 0; i < self.subviews.count; i++){
        UIImage *indicatorImage = (i == self.currentPage) ? self.selectedImage : self.normalImage;
        UIView *indicatorView = self.subviews[i];
        indicatorView.frame = CGRectMake(indicatorView.frame.origin.x, indicatorView.frame.origin.y, indicatorImage.size.width, indicatorImage.size.height);
        indicatorView.backgroundColor = [UIColor colorWithPatternImage:indicatorImage];
        if ([indicatorView isKindOfClass:UIImage.class]) {
            UIImageView *indicatorImageView = (UIImageView *) indicatorView;
            indicatorImageView.frame = CGRectMake(indicatorView.frame.origin.x, indicatorView.frame.origin.y, indicatorImage.size.width, indicatorImage.size.height);
        }
    }
}

- (void)updateDots {
    UIImage *selectedImage = [UIImage imageNamed:@"your_active_page_dot_image"];
    UIImage *normalImage = [UIImage imageNamed:@"your_inactive_page_dot_image"];
    [self updateViewForSelectedImage:selectedImage normalImage:normalImage];
}


@end