[英]navigationController rules doesn't work on ViewController
我的問題是navigationController
規則不適用。
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)
}
結果如下-顏色不存在
我該怎么辦?
您設置樣式屬性的代碼看起來正確。 navigationController
可能為nil。
更好的方法是使用自定義導航控制器子類,並將其連接到“界面”構建器中的導航控制器。
open class NavigationController: UINavigationController {
open override func viewDidLoad() {
super.viewDidLoad()
navigationBar.barTintColor = UIColor.blue
}
}
首先,您設置bartintColor,然后在導航欄中設置“清晰圖像” :)當然,它是透明的。
您需要某種顏色的圖像或用代碼創建它:(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()
}
}
並在導航欄中設置圖像,如下所示:
當控制器出現時調用此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()
}
我不確定您要問的問題是什么,但是如果您要更改導航欄的顏色,我建議您更改:
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)
這會將顏色添加為背景顏色,而不只是色調顏色。
使用此代碼
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
}
}
你可以用這種方式
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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