更改导航栏底部边框颜色Swift [英] Change navigation bar bottom border color Swift

问题描述

它与

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
    self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

extension UIColor {
    func as1ptImage() -> UIImage {
        UIGraphicsBeginImageContext(CGSizeMake(1, 1))
        let ctx = UIGraphicsGetCurrentContext()
        self.setFill()
        CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

但是，当我添加UITableView时，它没有出现在菜单上；当我添加UISearchView时，它出现了，但是删除了导航栏.

But when I add a UITableView it doesn't appear on it and when I add a UISearchView it appears but removes the navigation bar.

有人知道如何解决这个问题吗?

Anyone knows how to solve this?

推荐答案

您必须调整导航栏的shadowImage属性.

You have to adjust the shadowImage property of the navigation bar.

尝试这个.我在UIColor上创建了一个类别作为帮助程序，但是您可以重构自己喜欢的方式.

Try this one. I created a category on UIColor as an helper, but you can refactor the way you prefer.

extension UIColor {
    func as1ptImage() -> UIImage {
        UIGraphicsBeginImageContext(CGSizeMake(1, 1))
        let ctx = UIGraphicsGetCurrentContext()
        self.setFill()
        CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

选项1:在单个导航栏上

然后在视图控制器中(将UIColor更改为所需的颜色):

Option 1: on a single navigation bar

And then in your view controller (change the UIColor to what you like):

// We can use a 1px image with the color we want for the shadow image
self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()

// We need to replace the navigation bar's background image as well 
// in order to make the shadowImage appear. We use the same 1px color tecnique
self.navigationController?.navigationBar.setBackgroundImage(UIColor.yellowColor‌​().as1ptImage(), forBarMetrics: .Default)    

选项2:在所有导航栏上使用外观代理

代替在每个导航栏上设置背景图像和阴影图像，可以依赖UIAppearance代理.您可以尝试将这些行添加到AppDelegate中，而不是在viewDidLoad中添加之前的行.

Option 2: using appearance proxy, on all navigation bars

Instead of setting the background image and shadow image on each navigation bar, it is possible to rely on UIAppearance proxy. You could try to add those lines to your AppDelegate, instead of adding the previous ones in the viewDidLoad.

// We can use a 1px image with the color we want for the shadow image
UINavigationBar.appearance().shadowImage = UIColor.redColor().as1ptImage()

// We need to replace the navigation bar's background image as well 
// in order to make the shadowImage appear. We use the same 1px color technique
UINavigationBar.appearance().setBackgroundImage(UIColor.yellowColor().as1ptImage(), forBarMetrics: .Default)

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