作者:CSN | 来源:互联网 | 2023-01-18 17:16
如何在iOS 11中为大型标题NavigationBar设置自定义背景图像?我正在使用我已分配给故事板中的navigationControllers的自定义子类.
这是我创建自定义NavBar的方法:
class CustomNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.navigationBar.tintColor = UIColor(red:1, green:1, blue:1, alpha:0.6)
self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
if #available(iOS 11.0, *) {
self.navigationBar.prefersLargeTitles = true
self.navigationItem.largeTitleDisplayMode = .automatic
self.navigationBar.largeTitleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
self.navigationBar.barTintColor = UIColor.green
}
self.navigationBar.isTranslucent = false
self.navigationBar.setBackgroundImage(#imageLiteral(resourceName: "navigationBarBackground"), for: .default)
self.navigationBar.shadowImage = #imageLiteral(resourceName: "navigationBarShadow")
}
}
奇怪的setBackgroundImage(image, for: .default)
是,这对大型游戏不起作用.以前在iOS 10上工作过,如果我旋转iPhone(并激活小型NavBar)背景又回来了吗?
编辑:
在backgroundImage
仍然呈现,但不知隐藏.仅当您开始滚动并出现"普通"导航栏时,才会看到backgroundImage.另外,barTintColor
完全是在这种情况下被忽略.
1> oldrinmendez..:
我有同样的问题,修复它
删除setBackgroundImage并将barTint颜色与模式图像一起使用
let bgimage = imageWithGradient(startColor: UIColor.red, endColor: UIColor.yellow, size: CGSize(width: UIScreen.main.bounds.size.width, height: 1))
self.navigationBar.barTintColor = UIColor(patternImage: bgimage!)
使用渐变颜色获取图像
func imageWithGradient(startColor:UIColor, endColor:UIColor, size:CGSize, horizontally:Bool = true) -> UIImage? {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
if horizontally {
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
} else {
gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.0)
gradientLayer.endPoint = CGPoint(x: 0.5, y: 1.0)
}
UIGraphicsBeginImageContext(gradientLayer.bounds.size)
gradientLayer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
2> 小智..:
在iOS 11中,如果使用大标题,则无需再设置BackgroundImage(删除其声明)。相反,您需要使用BarTintColor。
class CustomNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.navigationBar.tintColor = UIColor(red:1, green:1, blue:1, alpha:0.6)
self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
if #available(iOS 11.0, *) {
self.navigationBar.prefersLargeTitles = true
self.navigationItem.largeTitleDisplayMode = .automatic
self.navigationBar.largeTitleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
self.navigationBar.barTintColor = UIColor(red:1, green:1, blue:1, alpha:1)
}
else {
self.navigationBar.setBackgroundImage(#imageLiteral(resourceName: "navigationBarBackground"), for: .default)
}
self.navigationBar.shadowImage = #imageLiteral(resourceName: "navigationBarShadow")
self.navigationBar.isTranslucent = false
}
}