if let version = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String {
        lblVersion.text = "Version \(version)"

    }

Xcode 8, Swift 3:

let gAppVersion = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") ?? "0"
let gAppBuild = Bundle.main.object(forInfoDictionaryKey: "CFBundleVersion") ?? "0"

extension UIApplication {

    static var appVersion: String {
        if let appVersion = NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleShortVersionString") {
            return "\(appVersion)"
        } else {
            return ""
        }
    }

    static var build: String {
        if let buildVersion = NSBundle.mainBundle().objectForInfoDictionaryKey(kCFBundleVersionKey as String) {
            return "\(buildVersion)"
        } else {
            return ""
        }
    }

    static var versionBuild: String {
        let version = UIApplication.appVersion
        let build = UIApplication.build

        var versionAndBuild = "v\(version)"

        if version != build {
            versionAndBuild = "v\(version)(\(build))"
        }

        return versionAndBuild
    }

}

注意: 你应该在这里使用if，以防应用程序版本或构建没有设置，这将导致崩溃，如果你尝试使用!打开。

2022年，Swift 5

extension Bundle {
    public var appName: String           { getInfo("CFBundleName")  }
    public var displayName: String       { getInfo("CFBundleDisplayName")}
    public var language: String          { getInfo("CFBundleDevelopmentRegion")}
    public var identifier: String        { getInfo("CFBundleIdentifier")}
    public var copyright: String         { getInfo("NSHumanReadableCopyright").replacingOccurrences(of: "\\\\n", with: "\n") }
    
    public var appBuild: String          { getInfo("CFBundleVersion") }
    public var appVersionLong: String    { getInfo("CFBundleShortVersionString") }
    //public var appVersionShort: String { getInfo("CFBundleShortVersion") }
    
    fileprivate func getInfo(_ str: String) -> String { infoDictionary?[str] as? String ?? "⚠️" }
}

用法(SwiftUI样本):

    Text("Ver: \(Bundle.main.appVersionLong) (\(Bundle.main.appBuild)) ")
    
    Text(Bundle.main.copyright)
        .font(.system(size: 10, weight: .thin))
        .multilineTextAlignment(.center)

奖励:版权支持\n符号!

对于任何感兴趣的人，在github上有一个漂亮而整洁的库叫做SwifterSwift，它也有完整的swift版本文档(参见swifterswift.com)。

使用这个库，读取应用版本和构建号就像这样简单:

import SwifterSwift

let buildNumber = SwifterSwift.appBuild
let version = SwifterSwift.appVersion

鉴于Swift一直在发展，我的回答(截至2015年8月):

let version = NSBundle.mainBundle().infoDictionary!["CFBundleVersion"] as! String