ios - UINavigationBar 和 UISearchBar 上的颜色不匹配

Question

很简单，我在制作完全彩色的导航栏和搜索栏时遇到了问题。 这些元素都不是透明的。这是屏幕截图和相关代码。

相关代码:

    super.viewDidLoad()
    self.navigationController?.isNavigationBarHidden = false

    let navigationBar = navigationController!.navigationBar

    navigationBar.isTranslucent = false

    let rect = CGRect(origin: CGPoint(x: 0, y:0), size: CGSize(width: 1, height: 1))
    UIGraphicsBeginImageContext(rect.size)
    let context = UIGraphicsGetCurrentContext()!
    context.setFillColor(UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0).cgColor)
    context.fill(rect)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    navigationBar.setBackgroundImage(image, for: UIBarMetrics.default)

    navigationBar.shadowImage = UIImage()

    searchBar.layer.borderWidth = 1
    searchBar.layer.borderColor = UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0).cgColor



    tblFriends.delegate = self
    tblFriends.dataSource = self

    tblFriends.register(UINib(nibName: "FriendCell", bundle: nil), forCellReuseIdentifier: "FriendCell")

我正在手动设置导航栏的背景图像，以移除两个元素之间的 shadowImage。

有问题的颜色应该是 86,200,246。但这两个元素都不是那个，而且两者都不匹配。同样，这两个元素都不是透明的。怎么回事？

Answer 1

我结合了 Joe 的代码和我自己的代码，为 iOS 10 提出了一个可行的解决方案。

let rect = CGRect(origin: CGPoint(x: 0, y:0), size: CGSize(width: 1, height: 1))
UIGraphicsBeginImageContext(rect.size)
let context = UIGraphicsGetCurrentContext()!
context.setFillColor(UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0).cgColor)
context.fill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

//To change Navigation Background colour.
navigationController?.navigationBar.setBackgroundImage(image, for: UIBarPosition.any, barMetrics: UIBarMetrics.default)
navigationController?.navigationBar.shadowImage = UIImage()
navigationController?.navigationBar.isTranslucent = false
navigationController?.navigationBar.barTintColor = UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0)

//To change SearchBar Background colour.
self.searchBar.isTranslucent = false
self.searchBar.backgroundImage = image
searchBar.barTintColor = UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0)
searchBar.layer.borderColor  = UIColor(red: 86.0/255.0, green: 200.0/255.0, blue: 246.0/255.0, alpha: 1.0).cgColor