Swift 写的版本比较工具 Versions

Swift 写的版本比较工具 Versions，可以使用字符串的方式比较版本号。

示例代码：

Comparing with the current applications version couldn't be easier.

// App.version is 1.0.0
if App.version.olderThan("2.0.0") {
  // Prompt user to update
}

But you can apply this to more things than just the CFBundleShortVersionString .

let currentVersion = "1.0.1a"
if currentVersion.olderThan("1.1.3") {
    // update
}

Versions also support semantic versioning (Major , Minor , Patch )

if "1.0".semanticCompare("2.0") == Semantic.Major) {
    // major update
}