siwft中单例的使用方法

创建单例

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class TheOneAndOnlyKraken {
static let sharedInstance = TheOneAndOnlyKraken()
private init() {
print("helloWorld")
}
}

class Manager {
static let shared: Manager = {
let instance = Manager()
return instance
}()
}
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用法

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let manager = Manager.shared

let onceAndKrekon = TheOneAndOnlyKraken.sharedInstance
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