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i8d0g
V2EX    Swift

Swift 真的玩不来啊...

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  •   i8d0g 2015-08-14 10:06:41 +08:00 4156 次点击

    这是一个创建于 3791 天前的主题,其中的信息可能已经有所发展或是发生改变。
    定义了这么个数组字面量,没问题.
    let a = [[["a","b","c","d"],[1,1,1,1]]]

    我写成
    let a = [[["a","b","c","d"],[1,1,1,1]],[["u","i","o","p"],[2,2,2,2]]]

    报错

    '[Array<Array<NSObject>>]' is not convertible to 'IntegerLiteralConvertible'

    playground里没问题 ,写程序里就报错,而且会导致xcode出问题,代码高亮乱了,顶部一直在indexing,把这个数组再写大些,xcode就爆掉了,显示占用内存10G - -
    8 条回复    2015-08-14 11:50:22 +08:00
    ipconfiger
        1
    ipconfiger  
       2015-08-14 10:22:12 +08:00
    真是找bug的一把好手,建议楼举转行测试吧,哈哈,玩笑
    cxe2v
        2
    cxe2v  
       2015-08-14 10:22:59 +08:00
    有这么吊?晚上回去一定要试试
    dorentus
        3
    dorentus  
       2015-08-14 10:25:11 +08:00
    let a = [[["a","b","c","d"],[1,1,1,1]]] // 这一个就应该报错才对

    [["a","b","c","d"], [1,1,1,1]] 这个 array literal 第一个元素和第二个元素的类型不一致,["a","b","c","d"] 是 [String],而 [1,1,1,1] 是 [Int],编译器无法推导出这个 array literal 的类型
    ipconfiger
        4
    ipconfiger  
       2015-08-14 10:25:56 +08:00
    看起来像是swift的一个bug,不过作为一个强类型语言,swift真的是很变态的强类型,严格得非常的处女座,这里估计是字面量在转换类型的时候和你期望的不一致,我猜
    ipconfiger
        5
    ipconfiger  
       2015-08-14 10:26:57 +08:00
    @dorentus Array<NSObject>
    dorentus
        6
    dorentus  
       2015-08-14 10:27:43 +08:00
    Array 需要里面每个元素都是一样的类型
    i8d0g
        7
    i8d0g  
    OP
       2015-08-14 10:30:57 +08:00
    @dorentus 好像是这么回事哦...
    不过再playground里真的可以...
    DingSoung
        8
    DingSoung  
       2015-08-14 11:50:22 +08:00
    曾经Xcode 占了63.9GB内存 (RAM)
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