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
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
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;
}
}
}
}
Simply change the UIPageControl page indicator Color with pattern Image self.pageControl.currentPageIndicatorTintColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"circle"]];
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
}
}
Attached images:
I've created a custom page controller that should function in mostly the same way without hacking into the internals of a UIPageControl or having a whole library for one small widget.
Just place an empty UIStackView in your storyboard and make its custom class this class below, and use numberOfPages and currentPage just like a normal UIPageControl. Set the spacing on the UIStackView to change how much space there is between the views.
Swift 4.2
/**
If adding via storyboard, you should not need to set a width and height constraint for this view,
just set a placeholder for each so autolayout doesnt complain and this view will size itself once its populated with pages at runtime
*/
class PageControl: UIStackView {
@IBInspectable var currentPageImage: UIImage = UIImage(named: "whiteCircleFilled")!
@IBInspectable var pageImage: UIImage = UIImage(named: "whiteCircleOutlined")!
/**
Sets how many page indicators will show
*/
var numberOfPages = 3 {
didSet {
layoutIndicators()
}
}
/**
Sets which page indicator will be highlighted with the **currentPageImage**
*/
var currentPage = 0 {
didSet {
setCurrentPageIndicator()
}
}
override func awakeFromNib() {
super.awakeFromNib()
axis = .horizontal
distribution = .equalSpacing
alignment = .center
layoutIndicators()
}
private func layoutIndicators() {
for i in 0..<numberOfPages {
let imageView: UIImageView
if i < arrangedSubviews.count {
imageView = arrangedSubviews[i] as! UIImageView // reuse subview if possible
} else {
imageView = UIImageView()
addArrangedSubview(imageView)
}
if i == currentPage {
imageView.image = currentPageImage
} else {
imageView.image = pageImage
}
}
// remove excess subviews if any
let subviewCount = arrangedSubviews.count
if numberOfPages < subviewCount {
for _ in numberOfPages..<subviewCount {
arrangedSubviews.last?.removeFromSuperview()
}
}
}
private func setCurrentPageIndicator() {
for i in 0..<arrangedSubviews.count {
let imageView = arrangedSubviews[i] as! UIImageView
if i == currentPage {
imageView.image = currentPageImage
} else {
imageView.image = pageImage
}
}
}
}
Works for my purposes but I make no guarantees
Update for Swift 3.0 ... you know if you are OK with accepting stated risk: "Modifying the subviews of an existing control is fragile".
import UIKit
class CustomImagePageControl: UIPageControl {
let activeImage:UIImage = UIImage(named: "SelectedPage")!
let inactiveImage:UIImage = UIImage(named: "UnselectedPage")!
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 {
if let imageView = self.imageForSubview(view) {
if i == self.currentPage {
imageView.image = self.activeImage
} else {
imageView.image = self.inactiveImage
}
i = i + 1
} else {
var dotImage = self.inactiveImage
if i == self.currentPage {
dotImage = self.activeImage
}
view.clipsToBounds = false
view.addSubview(UIImageView(image:dotImage))
i = i + 1
}
}
}
fileprivate func imageForSubview(_ 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
}
}
You just need do it like this:
((UIImageView *)[[yourPageControl subviews] objectAtIndex:0]).image=[UIImage imageNamed:@"search.png"];
I think for this you need to customize whole UIPageControl. Please find more out at below links
From iOS 14 you can get and set the indicator image with these methods:
@available(iOS 14.0, *)
open func indicatorImage(forPage page: Int) -> UIImage?
@available(iOS 14.0, *)
open func setIndicatorImage(_ image: UIImage?, forPage page: Int)
From iProgrammer's answer
In case you want to hide the original dot
- (UIImageView *)imageViewForSubview:(UIView *)view {
UIImageView * dot = nil;
[view setBackgroundColor:[UIColor clearColor]]; << add this line
Following the previous answers I came up with the solution below. Keep in mind that I had to add valueChanged listener that calls updateDots() as well in controller to handle taps made on UIPageControl
import UIKit
class PageControl: UIPageControl {
private struct Constants {
static let activeColor: UIColor = .white
static let inactiveColor: UIColor = .black
static let locationImage: UIImage = UIImage(named: "Location")!
}
// Update dots when currentPage changes
override var currentPage: Int {
didSet {
updateDots()
}
}
override func awakeFromNib() {
super.awakeFromNib()
self.pageIndicatorTintColor = .clear
self.currentPageIndicatorTintColor = .clear
}
func updateDots() {
for (index, view) in self.subviews.enumerated() {
// Layers will be redrawn, remove old.
view.layer.sublayers?.removeAll()
if index == 0 {
drawImage(view: view)
} else {
drawDot(index: index, view: view)
}
}
}
private func drawDot(index: Int, view: UIView) {
let dotLayer = CAShapeLayer()
dotLayer.path = UIBezierPath(ovalIn: view.bounds).cgPath
dotLayer.fillColor = getColor(index: index)
view.layer.addSublayer(dotLayer)
}
private func drawImage(view: UIView) {
let height = view.bounds.height * 2
let width = view.bounds.width * 2
let topMargin: CGFloat = -3.5
let maskLayer = CALayer()
maskLayer.frame = CGRect(x: 0, y: 0, width: width, height: height)
maskLayer.contents = Constants.locationImage.cgImage
maskLayer.contentsGravity = .resizeAspect
let imageLayer = CALayer()
imageLayer.frame = CGRect(x:0, y: topMargin, width: width, height: height)
imageLayer.mask = maskLayer
imageLayer.backgroundColor = getColor()
view.backgroundColor = .clear // Otherwise black background
view.layer.addSublayer(imageLayer)
}
private func getColor(index: Int? = 0) -> CGColor {
return currentPage == index ? Constants.activeColor.cgColor : Constants.inactiveColor.cgColor
}
}
