关键字是lazy,只能是var的变量才能懒加载

lazy@H_404_4@ var@H_404_4@ count = 100@H_404_4@

lazy@H_404_4@ var@H_404_4@ count = {
    return@H_404_4@ 100@H_404_4@
}()

//闭包中如果是多行代码就要报错：unable to infer complex closure return type

lazy@H_404_4@ var@H_404_4@ count = {
    var@H_404_4@ a = 100@H_404_4@
    var@H_404_4@ b = 100@H_404_4@
    return@H_404_4@ a+b
}()

解决闭包不能推断返回类型即可，下面三种方法

lazy var@H_404_4@ count@H_404_4@: Int = {
    var@H_404_4@ a = 100@H_404_4@
    var@H_404_4@ b = 100@H_404_4@
    return@H_404_4@ a+b
}()

lazy var@H_404_4@ count = {
    var@H_404_4@ a = 100@H_404_4@
    var@H_404_4@ b = 100@H_404_4@
    return@H_404_4@ a+b
}() as Int

lazy var@H_404_4@ count =  {
    ()@H_404_4@ ->@H_404_4@ Int in@H_404_4@
    var@H_404_4@ a = 100@H_404_4@
    var@H_404_4@ b = 100@H_404_4@
    return@H_404_4@ a+b
}()