问题描述
我想在我的应用程序中自定义 MFMailComposeViewController 样式及其行为,但我所有的尝试都失败了。我尝试了几种方法: 第一种方式:
let mailComposeViewController = MFMailComposeViewController()
...
UINavigationBar.appearance().tintColor = UIColor.red //don't see changes
UINavigationBar.appearance().barTintColor = UIColor.green //don't see changes
UINavigationBar.appearance().backgroundColor = UIColor.yellow //don't see changes
UINavigationBar.appearance().isTranslucent = false //don't see changes
UINavigationBar.appearance().clipsToBounds = false //don't see changes
UINavigationBar.appearance().prefersLargeTitles = false //don't see changes
present(mailComposeViewController,animated: true,completion: nil)
第二种方式:
extension MFMailComposeViewController {
open override func viewDidLoad() {
super.viewDidLoad()
self.navigationBar.clipsToBounds = true //don't see changes
self.navigationBar.prefersLargeTitles = false //don't see changes
self.navigationBar.isTranslucent = false //don't see changes
self.navigationBar.barTintColor = UIColor.green //don't see changes
self.navigationBar.tintColor = UIColor.red //only this works!
}
}
PS 我最感兴趣的是将 prefersLargeTitles 更改为 false 或更改 navigationBarStyle 如下:
我的结果:
解决方法
来自苹果:
重要 您不得修改此视图控制器呈现的视图层次结构。但是,您可以使用 UIAppearance 协议自定义界面的外观。
我认为 Apple 在第二种方式上不批准您的代码,您不应该修改此视图。但是,请尝试:
UINavigationBar.appearance().tintColor = UIColor.red
UINavigationBar.appearance().barTintColor = UIColor.green
UINavigationBar.appearance().backgroundColor = UIColor.yellow
UINavigationBar.appearance().isTranslucent = false
UINavigationBar.appearance().clipsToBounds = false
UINavigationBar.appearance().prefersLargeTitles = false
let mailComposeViewController = MFMailComposeViewController()
present(mailComposeViewController,animated: true,completion: nil)