Swift 寫的版本比較工具 Versions，可以使用字符串的方式比較版本號(hào)。
示例代碼：
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
}