[英]navigationController rules doesn't work on ViewController
我的问题是navigationController
规则不适用。
override func viewDidLoad() {
super.viewDidLoad()
navigationBarColor()
}
func navigationBarColor() {
navigationController?.navigationBar.barTintColor = UIColor(red:0.91, green:0.04, blue:0.51, alpha:1.0)
navigationController?.navigationBar.shadowImage = UIImage()
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
}
结果如下-颜色不存在
我该怎么办?
您设置样式属性的代码看起来正确。 navigationController
可能为nil。
更好的方法是使用自定义导航控制器子类,并将其连接到“界面”构建器中的导航控制器。
open class NavigationController: UINavigationController {
open override func viewDidLoad() {
super.viewDidLoad()
navigationBar.barTintColor = UIColor.blue
}
}
首先,您设置bartintColor,然后在导航栏中设置“清晰图像” :)当然,它是透明的。
您需要某种颜色的图像或用代码创建它:(例如)
extension UIImage {
class func imageWithColor(_ color: UIColor) -> UIImage {
let rect = CGRect(origin: CGPoint.zero, size: CGSize(width: 1.0, height: 1.0))
UIGraphicsBeginImageContext(rect.size);
guard let context = UIGraphicsGetCurrentContext() else {
UIGraphicsEndImageContext()
return UIImage()
}
context.setFillColor(color.cgColor);
context.fill(rect);
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
}
并在导航栏中设置图像,如下所示:
当控制器出现时调用此navigationBar更改
func updatenavigationBar() {
navigationController?.navigationBar.tintColor = .white
navigationController?.navigationBar.isTranslucent = true
navigationController?.navigationBar.setBackgroundImage(UIImage.imageWithColor(color), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()
}
我不确定您要问的问题是什么,但是如果您要更改导航栏的颜色,我建议您更改:
navigationController?.navigationBar.barTintColor = UIColor(red:0.91, green:0.04, blue:0.51, alpha:1.0)
至:
navigationController?.navigationBar.backgroundColor = UIColor(red:0.91, green:0.04, blue:0.51, alpha:1.0)
这会将颜色添加为背景颜色,而不只是色调颜色。
使用此代码
import Foundation
import Swift
extension UINavigationController
{
func setMainTopNavigationBarAttribute() -> Void
{
self.navigationBar.shadowImage = UIImage()
self.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationBar.isTranslucent = false
self.navigationBar.tintColor = UIColor.white
self.navigationBar.backgroundColor = UIColor.white
}
}
你可以用这种方式
let navigationController = UIStoryboard.user.instantiateViewController(withIdentifier: "MMNavigationController") as! UINavigationController
navigationController.setMainTopNavigationBarAttribute()
You just change this two line in your function
func navigationBarColor() {
navigationController?.navigationBar.barTintColor = UIColor(red:0.91, green:0.04, blue:0.51, alpha:1.0)
//change this two line in your function
navigationController?.navigationBar.shadowImage = UIImage.init(named: "")
navigationController?.navigationBar.setBackgroundImage(UIImage.init(named: ""), for: .default)
}
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