Swift 3.0

Question

我试图检查Swift中的系统信息。我想通过代码可以实现：

var sysData:CMutablePointer<utsname> = nil
let retVal:CInt = uname(sysData)

我对此代码有两个问题：

sysData的初始值应该是多少？此示例在retVal中给出-1可能是因为sysData为nil。
如何从sysData中读取信息？

Answer 1

对于iOS，请尝试：

var systemVersion = UIDevice.current.systemVersion

对于OS X，请尝试：

var systemVersion = NSProcessInfo.processInfo().operatingSystemVersion

如果您只是想检查用户是否至少运行了特定版本，您还可以使用以下适用于iOS和OS X的Swift 2功能：

if #available(iOS 9.0, *) {
    // use the feature only available in iOS 9
    // for ex. UIStackView
} else {
    // or use some work around
}

但建议不要检查操作系统版本。最好检查设备上是否有可用的功能，而不是比较版本号。 对于iOS，如上所述，您应该检查它是否响应选择器; 例如：

if (self.respondsToSelector(Selector("showViewController"))) {
    self.showViewController(vc, sender: self)
} else {
    // some work around
}

Answer 2

<强>更新
现在，您应该使用Swift 2引入的新可用性检查：
例如要在编译时检查iOS 9.0或更高版本，请使用以下命令：

if #available(iOS 9.0, *) {
    // use UIStackView
} else {
    // show sad face emoji
}

或可以与整个方法或类一起使用

@available(iOS 9.0, *)
func useStackView() {
    // use UIStackView
}

有关详细信息，请参阅this。

运行时检查：

如果您不想要确切版本但想要使用if检查iOS 9,10或11：

let floatVersion = (UIDevice.current.systemVersion as NSString).floatValue

修改刚刚找到另一种方法来实现这一目标：

let iOS8 = floor(NSFoundationVersionNumber) > floor(NSFoundationVersionNumber_iOS_7_1) let iOS7 = floor(NSFoundationVersionNumber) <= floor(NSFoundationVersionNumber_iOS_7_1)

Answer 3

我创建了从以下链接传输到swift的辅助函数：

How can we programmatically detect which iOS version is device running on?

func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool {
    return UIDevice.currentDevice().systemVersion.compare(version,
        options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedSame
}

func SYSTEM_VERSION_GREATER_THAN(version: String) -> Bool {
    return UIDevice.currentDevice().systemVersion.compare(version,
        options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedDescending
}

func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.currentDevice().systemVersion.compare(version,
        options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedAscending
}

func SYSTEM_VERSION_LESS_THAN(version: String) -> Bool {
    return UIDevice.currentDevice().systemVersion.compare(version,
        options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedAscending
}

func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.currentDevice().systemVersion.compare(version,
        options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedDescending
}

可以像这样使用：

SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO("7.0")

Swift 4.2

func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == .orderedSame
}

func SYSTEM_VERSION_GREATER_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == .orderedDescending
}

func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) != .orderedAscending
}

func SYSTEM_VERSION_LESS_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == .orderedAscending
}

func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) != .orderedDescending
}

Answer 4

Swift 3.0

我们不需要创建扩展，因为ProcessInfo为我们提供了版本信息。您可以看到iOS的示例代码，如下所示。

let os = ProcessInfo().operatingSystemVersion
switch (os.majorVersion, os.minorVersion, os.patchVersion) {
case (8, 0, _):
    print("iOS >= 8.0.0, < 8.1.0")
case (8, _, _):
    print("iOS >= 8.1.0, < 9.0")
case (9, _, _):
    print("iOS >= 9.0.0")
default:
    // this code will have already crashed on iOS 7, so >= iOS 10.0
    println("iOS >= 10.0.0")
}

参考：http://nshipster.com/swift-system-version-checking/

Answer 5

我将这个Singleton用于简单使用，创建了一个IOSVersion.swift文件并添加了以下代码：

import UIKit

public class IOSVersion {
    class func SYSTEM_VERSION_EQUAL_TO(version: NSString) -> Bool {
        return UIDevice.currentDevice().systemVersion.compare(version,
            options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedSame
    }

    class func SYSTEM_VERSION_GREATER_THAN(version: NSString) -> Bool {
        return UIDevice.currentDevice().systemVersion.compare(version as String,
            options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedDescending
    }

    class func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: NSString) -> Bool {
        return UIDevice.currentDevice().systemVersion.compare(version as String,
            options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedAscending
    }

    class func SYSTEM_VERSION_LESS_THAN(version: NSString) -> Bool {
        return UIDevice.currentDevice().systemVersion.compare(version as String,
            options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedAscending
    }

    class func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(version: NSString) -> Bool {
        return UIDevice.currentDevice().systemVersion.compare(version as String,
            options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedDescending
    }
}

使用

IOSVersion.SYSTEM_VERSION_EQUAL_TO("8.0")
IOSVersion.SYSTEM_VERSION_LESS_THAN("8.0")

感谢@KVISH

编辑Swift 2：

if #available(iOS 9.0, *) {
    //  
} else {
    // 
}

Answer 6

Swift 4

func run() {
    let version = OperatingSystemVersion(majorVersion: 11, minorVersion: 0, patchVersion: 0)
    if ProcessInfo.processInfo.isOperatingSystemAtLeast(version) {
        runNewCode()
    } else {
        runLegacyCode()
    }
}

func runNewCode() {
    guard #available(iOS 11.0, *) else {
        fatalError()
    }
    // do new stuff
}

func runLegacyCode() {
    // do old stuff
}

Answer 7

如果您使用的是 Swift 2 ，并且想要检查操作系统版本以使用某个API，则可以使用新的可用性功能：

if #available(iOS 8, *) {
    //iOS 8+ code here.
}
else {
    //Code for iOS 7 and older versions.
    //An important note: if you use #availability, Xcode will also 
    //check that you don't use anything that was introduced in iOS 8+
    //inside this `else` block. So, if you try to use UIAlertController
    //here, for instance, it won't compile. And it's great.
}

我写了这个答案，因为这是Google在swift 2 check system version查询中的第一个问题。

Answer 8

更新Swift 3.0 +

func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == ComparisonResult.orderedSame
}

func SYSTEM_VERSION_GREATER_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == ComparisonResult.orderedDescending
}

func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) != ComparisonResult.orderedAscending
}

func SYSTEM_VERSION_LESS_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) == ComparisonResult.orderedAscending
}

func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: .numeric) != ComparisonResult.orderedDescending
}

Answer 9

let Device = UIDevice.currentDevice()
let iosVersion = NSString(string: Device.systemVersion).doubleValue

let iOS8 = iosVersion >= 8
let iOS7 = iosVersion >= 7 && iosVersion < 8

并检查为

if(iOS8)
{

}
else 
{
}

Answer 10

在Swift 2及更高版本中检查系统版本（以及许多其他版本）的最简单和最简单的方法是：

if #available(iOS 9.0, *) { // check for iOS 9.0 and later

}

此外，使用#available，您可以检查以下版本：

iOS
iOSApplicationExtension
macOS
macOSApplicationExtension
watchOS
watchOSApplicationExtension
tvOS
tvOSApplicationExtension
swift

Answer 11

详细

Xcode 10.2.1（10E1001），Swift 5

链接

OperatingSystemVersion

解决方案

extension OperatingSystemVersion {
    func getFullVersion(separator: String = ".") -> String {
        return "\(majorVersion)\(separator)\(minorVersion)\(separator)\(patchVersion)"
    }
}

let os = ProcessInfo().operatingSystemVersion
print(os.majorVersion)          // 12
print(os.minorVersion)          // 2
print(os.patchVersion)          // 0
print(os.getFullVersion())      // 12.2.0

Answer 12

Swift 4.x

func iOS_VERSION_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedSame
}

func iOS_VERSION_GREATER_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedDescending
}

func iOS_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) != ComparisonResult.orderedAscending
}

func iOS_VERSION_LESS_THAN(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedAscending
}

func iOS_VERSION_LESS_THAN_OR_EQUAL_TO(version: String) -> Bool {
    return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) != ComparisonResult.orderedDescending
}

用法：

if iOS_VERSION_GREATER_THAN_OR_EQUAL_TO(version: "11.0") {
    //Do something!
}

<子> P.S。 KVISH的答案翻译成Swift 4.x并重命名了这些功能，因为我专门为iOS应用程序使用了这个代码片段。

Answer 13

Mattt Thompson分享了一个非常方便的方式

switch UIDevice.currentDevice().systemVersion.compare("8.0.0", options: NSStringCompareOptions.NumericSearch) {
case .OrderedSame, .OrderedDescending:
    println("iOS >= 8.0")
case .OrderedAscending:
    println("iOS < 8.0")
}

Answer 14

注意：适用于iOS 8.0及更高版本。 OS X v10.10及更高版本

var majorVersion: Int    { return NSProcessInfo.processInfo().operatingSystemVersion.majorVersion }
var minorVersion: Int    { return NSProcessInfo.processInfo().operatingSystemVersion.minorVersion }
var patchVersion: Int    { return NSProcessInfo.processInfo().operatingSystemVersion.patchVersion }
var myOSVersion:  String { return NSProcessInfo.processInfo().operatingSystemVersionString        }

Answer 15

获取当前版本的系统并将其拆分。所以你可以获得主要和次要版本。

let sys_version = UIDevice.current.systemVersion
let all_version = sys_version.components(separatedBy: ".")
print("Major version : \(all_version[0])")
print("Minor version : \(all_version[1])")

Answer 16

let osVersion = NSProcessInfo.processInfo().operatingSystemVersion
let versionString = osVersion.majorVersion.description + "." + osVersion.minorVersion.description + "." + osVersion.patchVersion.description
print(versionString)

Answer 17

此外，如果您想查看WatchOS。

夫特

let watchOSVersion = WKInterfaceDevice.currentDevice().systemVersion
print("WatchOS version: \(watchOSVersion)")

目标-C

NSString *watchOSVersion = [[WKInterfaceDevice currentDevice] systemVersion];
NSLog(@"WatchOS version: %@", watchOSVersion);

Answer 18

此处编写的大多数示例代码都会因零度版本而获得意外结果。例如，

func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool {
return UIDevice.current.systemVersion.compare(version, options: .numeric) != ComparisonResult.orderedAscending
}

对于iOS“10.3”中传递的版本“10.3.0”，此方法不会返回true。这种结果没有意义，它们必须被视为相同的版本。为了获得准确的比较结果，我们必须考虑比较版本字符串中的所有数字组件。此外，提供所有大写字母的全球方法并不是一个好方法。我们在SDK中使用的版本类型是String，因此扩展比较String中的功能是有意义的。

要比较系统版本，以下所有示例均可使用。

XCTAssertTrue(UIDevice.current.systemVersion.isVersion(lessThan: "99.0.0"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(equalTo: UIDevice.current.systemVersion))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(greaterThan: "3.5.99"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(lessThanOrEqualTo: "10.3.0.0.0.0.0.0"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(greaterThanOrEqualTo: "10.3"))

您可以在我的存储库中查看它 https://github.com/DragonCherry/VersionCompare

检查Swift中的操作系统版本？

18 个答案:

Swift 4.2

Swift 3.0

Swift 4

详细

链接

解决方案