Customize dot with image of UIPageControl at index 0 of UIPageControl

Question

I'm a new learner of ios programming. I have tried to search with another example and more questions at stackoverflow but it's not my goal. I want to set an image of dot at index 0 of UIPageControl as similar as iPhone search homescreen. Have any way to do it ? Please explain me with some code or another useful link.

Thanks in advance

Answer 1

I have found a solution for this problem. I know it is not the way but it will work till iOS 8 will be launched in the market.

Reason for Crash:

in iOS 7 [self.subViews objectAtIndex: i] returns UIView Instead of UIImageView and setImage is not the property of UIView and the app crashes. I solve my problem using this following code.

Check Whether the subview is UIView(for iOS7) or UIImageView(for iOS6 or earlier). And If it is UIView I am going to add UIImageView as subview on that view and voila its working and not crash..!!

-(void) updateDots
{
    for (int i = 0; i < [self.subviews count]; i++)
    {
        UIImageView * dot = [self imageViewForSubview:  [self.subviews objectAtIndex: i]];
        if (i == self.currentPage) dot.image = activeImage;
        else dot.image = inactiveImage;
    }
}
- (UIImageView *) imageViewForSubview: (UIView *) view
{
    UIImageView * dot = nil;
    if ([view isKindOfClass: [UIView class]])
    {
        for (UIView* subview in view.subviews)
        {
            if ([subview isKindOfClass:[UIImageView class]])
            {
                dot = (UIImageView *)subview;
                break;
            }
        }
        if (dot == nil)
        {
            dot = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, view.frame.size.width, view.frame.size.height)];
            [view addSubview:dot];
        }
    }
    else
    {
        dot = (UIImageView *) view;
    }

    return dot;
}

Also, to clear the images that are already there, set the tint colors for the existing indicators to transparent:

- (void)awakeFromNib
{   
    self.pageIndicatorTintColor = [UIColor clearColor];
    self.currentPageIndicatorTintColor = [UIColor clearColor];
}

Hope this will solve ur issue for iOS 7.

Happy coding

Answer 2

Try this link:-

Answer with GrayPageControl:- Is there a way to change page indicator dots color

It is really good and reliable.I also have used this code.

You might have to do some more customization as

-(void) updateDots
{
    for (int i = 0; i < [self.subviews count]; i++)
    {
        UIImageView* dot = [self.subviews objectAtIndex:i];

        if (i == self.currentPage) {
            if(i==0) {
                dot.image = [UIImage imageNamed:@"activesearch.png"];
            } else {
                dot.image = activeImage;
            }        
        } else {
            if(i==0) {
                dot.image = [UIImage imageNamed:@"inactivesearch.png"];
            } else {
                dot.image = inactiveImage;
            }
        }
    }
}

Answer 3

Simply change the UIPageControl page indicator Color with pattern Image self.pageControl.currentPageIndicatorTintColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"circle"]];

Answer 4

The best compilation of the code for Swift 3 to replace the first icon of UIPageControl by a location marker:

import UIKit

class LocationPageControl: UIPageControl {

    let locationArrow: UIImage = UIImage(named: "locationArrow")!
    let pageCircle: UIImage = UIImage(named: "pageCircle")!

    override var numberOfPages: Int {
        didSet {
            updateDots()
        }
    }

    override var currentPage: Int {
        didSet {
            updateDots()
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        self.pageIndicatorTintColor = UIColor.clear
        self.currentPageIndicatorTintColor = UIColor.clear
        self.clipsToBounds = false
    }

    func updateDots() {
        var i = 0
        for view in self.subviews {
            var imageView = self.imageView(forSubview: view)
            if imageView == nil {
                if i == 0 {
                    imageView = UIImageView(image: locationArrow)
                } else {
                    imageView = UIImageView(image: pageCircle)
                }
                imageView!.center = view.center
                view.addSubview(imageView!)
                view.clipsToBounds = false
            }
            if i == self.currentPage {
                imageView!.alpha = 1.0
            } else {
                imageView!.alpha = 0.5
            }
            i += 1
        }
    }

    fileprivate func imageView(forSubview view: UIView) -> UIImageView? {
        var dot: UIImageView?
        if let dotImageView = view as? UIImageView {
            dot = dotImageView
        } else {
            for foundView in view.subviews {
                if let imageView = foundView as? UIImageView {
                    dot = imageView
                    break
                }
            }
        }
        return dot
    }
}

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