如何快速更改标签栏的色调?
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【中文标题】如何快速更改标签栏的色调?【英文标题】:How to change tint color of tab bar in swift? 【发布时间】:2015-11-07 14:12:34 【问题描述】:我正在使用标签栏,但我有 2 个颜色问题。
第一个问题,色调是灰色的,我使用一些代码将其更改为白色,但只有在按下 Tab 时才会变为白色。
class AppDelegate: UIResponder, UIApplicationDelegate
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
// Override point for customization after application launch.
let barColor = UIColor(red: 49/255, green: 75/255, blue: 108/255, alpha: 1.0)
let pressedTintColor = UIColor.whiteColor()
UITabBar.appearance().barTintColor = barColor
UITabBar.appearance().tintColor = pressedTintColor
return true
第二个问题,按下的标签的背景颜色应该改变但它没有改变。
这就是标签栏的外观。
这就是它应该的样子。
(第 1 张是 Xcode Simulator 中的测试,第 2 张是设计的,所以标签的图像和文本并不重要)
所以它应该所有的标签都是白色的,当一个标签被按下来改变标签的背景颜色。
【问题讨论】:
【参考方案1】:要解决AppDelegate
中的问题,请执行以下操作:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
// Override point for customization after application launch.
UITabBar.appearance().tintColor = UIColor.whiteColor()
UITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.whiteColor()], forState: UIControlState.Normal)
return true
在你的ViewController
中做这样的事情:
extension UIImage
func makeImageWithColorAndSize(color: UIColor, size: CGSize) -> UIImage
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
UIRectFill(CGRectMake(0, 0, size.width, size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
extension UIImage
func imageWithColor(tintColor: UIColor) -> UIImage
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
let context = UIGraphicsGetCurrentContext()! as CGContextRef
CGContextTranslateCTM(context, 0, self.size.height)
CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, CGBlendMode.Normal)
let rect = CGRectMake(0, 0, self.size.width, self.size.height) as CGRect
CGContextClipToMask(context, rect, self.CGImage)
tintColor.setFill()
CGContextFillRect(context, rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext() as UIImage
UIGraphicsEndImageContext()
return newImage
class FirstViewController: UIViewController
var tabBar: UITabBar?
override func viewDidLoad()
super.viewDidLoad()
tabBar = self.tabBarController!.tabBar
tabBar!.selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar!.frame.width/CGFloat(tabBar!.items!.count), tabBar!.frame.height))
// To change tintColor for unselected tabs
for item in tabBar!.items! as [UITabBarItem]
if let image = item.image
item.image = image.imageWithColor(UIColor.whiteColor()).imageWithRenderingMode(.AlwaysOriginal)
override func didReceiveMemoryWarning()
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
*第一个extension
到UIImage
取自同一作者的另一个问题:How to change default grey color of tab bar items?
【讨论】:
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