问题
I want to change background color of UITabBarItem badge but can't find any resource on how to make it.
回答1:
UITabBarItem has this available since iOS 10.
var badgeColor: UIColor? { get set }
It's also available via appearence.
if #available(iOS 10, *) {
UITabBarItem.appearance().badgeColor = .green
}
reference docs: https://developer.apple.com/reference/uikit/uitabbaritem/1648567-badgecolor
回答2:
Changing the badge-color is now natively supported in iOS 10 and later using the badgeColor property inside your UITabBarItem. See the apple docs for more infos on the property.
Example:
- Swift 3:
myTab.badgeColor = UIColor.blue - Objective-C:
[myTab setBadgeColor:[UIColor blueColor]];
回答3:
I wrote this piece of code for my app, but I have only tested it in iOS 7.
for (UIView* tabBarButton in self.tabBar.subviews) {
for (UIView* badgeView in tabBarButton.subviews) {
NSString* className = NSStringFromClass([badgeView class]);
// looking for _UIBadgeView
if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
for (UIView* badgeSubview in badgeView.subviews) {
NSString* className = NSStringFromClass([badgeSubview class]);
// looking for _UIBadgeBackground
if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
@try {
[badgeSubview setValue:[UIImage imageNamed:@"YourCustomImage.png"] forKey:@"image"];
}
@catch (NSException *exception) {}
}
if ([badgeSubview isKindOfClass:[UILabel class]]) {
((UILabel *)badgeSubview).textColor = [UIColor greenColor];
}
}
}
}
}
You're only able to update the badge background with an image, not a color. I have also exposed the badge label if you wanted to update that in some way.
Its important to note that this code must be called after setting the tabBarItem.badgeValue!
EDIT: 4/14/14
The above code will work in iOS 7 when called anywhere. To get it working in iOS 7.1 call it in the view controllers -viewWillLayoutSubviews.
EDIT: 12/22/14
Here's an updated snippet which I'm currently using. I put the code in a category extension for simplicity.
- (void)badgeViews:(void (^)(UIView* badgeView, UILabel* badgeLabel, UIView* badgeBackground))block {
if (block) {
for (UIView* tabBarButton in self.subviews) {
for (UIView* badgeView in tabBarButton.subviews) {
NSString* className = NSStringFromClass([badgeView class]);
if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
UILabel* badgeLabel;
UIView* badgeBackground;
for (UIView* badgeSubview in badgeView.subviews) {
NSString* className = NSStringFromClass([badgeSubview class]);
if ([badgeSubview isKindOfClass:[UILabel class]]) {
badgeLabel = (UILabel *)badgeSubview;
} else if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
badgeBackground = badgeSubview;
}
}
block(badgeView, badgeLabel, badgeBackground);
}
}
}
}
}
Then when you're ready to call it, it'll look like this.
[self.tabBar badgeViews:^(UIView *badgeView, UILabel *badgeLabel, UIView *badgeBackground) {
}];
EDIT: 11/16/15
It's been brought to my attention that some people need a little more clarity on what's happening in this code. The for loops are searching for a few views which are not publicly accessible. By checking if the views class name contains a part of the expected name, it's ensuring to reach the intended view while not setting off any possible red flags by Apple. Once everything has been located, a block is executed with easy access to these views.
It's noteworthy that the possibility exists for this code to stop working in a future iOS update. For example these internal views could one day acquire different class names. However the chances of that are next to none since even internally Apple rarely refactors classes to this nature. But even if they were to, it would be something along the title of UITabBarBadgeView, which would still reach the expected point in code. Being that iOS9 is well out the door and this code is still working as intended, you can expect this problem to never arise.
回答4:
I have the same problem and solved it by creating a little category that replace the BadgeView with an UILabel that you can customize easily.
https://github.com/enryold/UITabBarItem-CustomBadge/
回答5:
For people using Swift, I managed to improve on TimWhiting answer in order to have the badge view working on any screen size and any orientation.
extension UITabBarController {
func setBadges(badgeValues: [Int]) {
for view in self.tabBar.subviews {
if view is CustomTabBadge {
view.removeFromSuperview()
}
}
for index in 0...badgeValues.count-1 {
if badgeValues[index] != 0 {
addBadge(index, value: badgeValues[index], color:UIColor(paletteItem: .Accent), font: UIFont(name: Constants.ThemeApp.regularFontName, size: 11)!)
}
}
}
func addBadge(index: Int, value: Int, color: UIColor, font: UIFont) {
let badgeView = CustomTabBadge()
badgeView.clipsToBounds = true
badgeView.textColor = UIColor.whiteColor()
badgeView.textAlignment = .Center
badgeView.font = font
badgeView.text = String(value)
badgeView.backgroundColor = color
badgeView.tag = index
tabBar.addSubview(badgeView)
self.positionBadges()
}
override public func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
self.positionBadges()
}
// Positioning
func positionBadges() {
var tabbarButtons = self.tabBar.subviews.filter { (view: UIView) -> Bool in
return view.userInteractionEnabled // only UITabBarButton are userInteractionEnabled
}
tabbarButtons = tabbarButtons.sort({ $0.frame.origin.x < $1.frame.origin.x })
for view in self.tabBar.subviews {
if view is CustomTabBadge {
let badgeView = view as! CustomTabBadge
self.positionBadge(badgeView, items:tabbarButtons, index: badgeView.tag)
}
}
}
func positionBadge(badgeView: UIView, items: [UIView], index: Int) {
let itemView = items[index]
let center = itemView.center
let xOffset: CGFloat = 12
let yOffset: CGFloat = -14
badgeView.frame.size = CGSizeMake(17, 17)
badgeView.center = CGPointMake(center.x + xOffset, center.y + yOffset)
badgeView.layer.cornerRadius = badgeView.bounds.width/2
tabBar.bringSubviewToFront(badgeView)
}
}
class CustomTabBadge: UILabel {}
回答6:
No you can't change the color but you can use your own badges instead. Add this extension at the file scope and you can customise the badges however you like. Just call self.tabBarController!.setBadges([1,0,2]) in any of your root view controllers.
To be clear that is for a tab bar with three items, with the badge values going from left to right.
extension UITabBarController {
func setBadges(badgeValues:[Int]){
var labelExistsForIndex = [Bool]()
for value in badgeValues {
labelExistsForIndex.append(false)
}
for view in self.tabBar.subviews {
if view.isKindOfClass(PGTabBadge) {
let badgeView = view as! PGTabBadge
let index = badgeView.tag
if badgeValues[index]==0 {
badgeView.removeFromSuperview()
}
labelExistsForIndex[index]=true
badgeView.text = String(badgeValues[index])
}
}
for var i=0;i<labelExistsForIndex.count;i++ {
if labelExistsForIndex[i] == false {
if badgeValues[i] > 0 {
addBadge(i, value: badgeValues[i], color:UIColor(red: 4/255, green: 110/255, blue: 188/255, alpha: 1), font: UIFont(name: "Helvetica-Light", size: 11)!)
}
}
}
}
func addBadge(index:Int,value:Int, color:UIColor, font:UIFont){
let itemPosition = CGFloat(index+1)
let itemWidth:CGFloat = tabBar.frame.width / CGFloat(tabBar.items!.count)
let bgColor = color
let xOffset:CGFloat = 12
let yOffset:CGFloat = -9
var badgeView = PGTabBadge()
badgeView.frame.size=CGSizeMake(17, 17)
badgeView.center=CGPointMake((itemWidth * itemPosition)-(itemWidth/2)+xOffset, 20+yOffset)
badgeView.layer.cornerRadius=badgeView.bounds.width/2
badgeView.clipsToBounds=true
badgeView.textColor=UIColor.whiteColor()
badgeView.textAlignment = .Center
badgeView.font = font
badgeView.text = String(value)
badgeView.backgroundColor = bgColor
badgeView.tag=index
tabBar.addSubview(badgeView)
}
}
class PGTabBadge: UILabel {
}
回答7:
Swift 3 Here is an updated version of @Kirualex's answer (who improved on @TimWhiting's answer) for Swift 3.
extension UITabBarController {
func setBadges(badgeValues: [Int]) {
for view in self.tabBar.subviews {
if view is CustomTabBadge {
view.removeFromSuperview()
}
}
for index in 0...badgeValues.count-1 {
if badgeValues[index] != 0 {
addBadge(index: index, value: badgeValues[index], color: UIColor.blue, font: UIFont(name: "Helvetica-Light", size: 11)!)
}
}
}
func addBadge(index: Int, value: Int, color: UIColor, font: UIFont) {
let badgeView = CustomTabBadge()
badgeView.clipsToBounds = true
badgeView.textColor = UIColor.white
badgeView.textAlignment = .center
badgeView.font = font
badgeView.text = String(value)
badgeView.backgroundColor = color
badgeView.tag = index
tabBar.addSubview(badgeView)
self.positionBadges()
}
override open func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
self.positionBadges()
}
// Positioning
func positionBadges() {
var tabbarButtons = self.tabBar.subviews.filter { (view: UIView) -> Bool in
return view.isUserInteractionEnabled // only UITabBarButton are userInteractionEnabled
}
tabbarButtons = tabbarButtons.sorted(by: { $0.frame.origin.x < $1.frame.origin.x })
for view in self.tabBar.subviews {
if view is CustomTabBadge {
let badgeView = view as! CustomTabBadge
self.positionBadge(badgeView: badgeView, items:tabbarButtons, index: badgeView.tag)
}
}
}
func positionBadge(badgeView: UIView, items: [UIView], index: Int) {
let itemView = items[index]
let center = itemView.center
let xOffset: CGFloat = 12
let yOffset: CGFloat = -14
badgeView.frame.size = CGSize(width: 17, height: 17)
badgeView.center = CGPoint(x: center.x + xOffset, y: center.y + yOffset)
badgeView.layer.cornerRadius = badgeView.bounds.width/2
tabBar.bringSubview(toFront: badgeView)
}
}
class CustomTabBadge: UILabel {}
回答8:
It appears that no. You may only set the value. From Apple's documentation badge is:
Text that is displayed in the upper-right corner of the item with a surrounding red oval.
回答9:
You need to specify tab item at index to change badge color, #available in iOS 10 ,
if #available(iOS 10.0, *)
{
self.kAppTabBarController.tabBar.items![1].badgeColor = YOUR_COLOR
}
回答10:
YES, But the only possible solution is to create a custom Tabbar and creating your custom tabbar badge icon. You will find many article/code for creating custom tabbar.
回答11:
// change TabBar BadgeView background Color
-(void)changeTabBarBadgeViewBgColor:(UITabBar*)tabBar {
for (UIView* tabBarButton in tabBar.subviews) {
for (UIView* badgeView in tabBarButton.subviews) {
NSString* className = NSStringFromClass([badgeView class]);
// looking for _UIBadgeView
if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
for (UIView* badgeSubview in badgeView.subviews) {
NSString* className = NSStringFromClass([badgeSubview class]);
// looking for _UIBadgeBackground
if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
@try {
[badgeSubview setValue:nil forKey:@"image"];
[badgeSubview setBackgroundColor:[UIColor blueColor]];
badgeSubview.clipsToBounds = YES;
badgeSubview.layer.cornerRadius = badgeSubview.frame.size.height/2;
}
@catch (NSException *exception) {}
}
if ([badgeSubview isKindOfClass:[UILabel class]]) {
((UILabel *)badgeSubview).textColor = [UIColor greenColor];
}
}
}
}
}
}
回答12:
You can now do it in the storyboard too, by selecting your tab bar item and going to the attributes inspector.
回答13:
Take a look here @ UITabbarItem-CustomBadge.
A complete demonstration is following
it takes only two line of code, if you want to use the default implementation
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//supplying the animation parameter
[UITabBarItem setDefaultAnimationProvider:[[DefaultTabbarBadgeAnimation alloc] init]];
[UITabBarItem setDefaultConfigurationProvider:[[DefaultSystemLikeBadgeConfiguration alloc] init]];
//rest of your code goes following...
return YES;
}
来源：https://stackoverflow.com/questions/13341603/is-it-possible-to-change-uitabbaritem-badge-color