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swift 单例模式

class ca{

    var count = 1;

    static var instance:ca = ca();

    class func GetInstance()->ca{

        return instance;

    }

}


var a = ca.GetInstance();

var b = ca.GetInstance();

a.count = 2;

println("\(a.count),\(b.count)");//2,2

swift 单例模式