在看 Raywenderlich 的 RxSwift 教材,有一个写法看不懂 - V2EX
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zenghaojim33
V2EX    iDev

在看 Raywenderlich 的 RxSwift 教材,有一个写法看不懂

  •  
  •   zenghaojim33 2017-09-30 11:36:54 +08:00 5064 次点击
    这是一个创建于 3008 天前的主题,其中的信息可能已经有所发展或是发生改变。
    12 条回复    2017-10-16 18:47:59 +08:00
    zenghaojim33
        1
    zenghaojim33  
    OP
       2017-09-30 11:37:36 +08:00
    这里中括号后面的(self)是什么意思?_?
    guitarkitten
        2
    guitarkitten  
       2017-09-30 11:46:30 +08:00
    { this in .... }(self) 这不就是一个调用么?
    abcyuxue123
        3
    abcyuxue123  
       2017-09-30 13:04:06 +08:00
    感觉 ls +1

    可以去掉 self 尝试运行,结果应该一样
    zenghaojim33
        4
    zenghaojim33  
    OP
       2017-09-30 14:12:49 +08:00
    @guitarkitten 还是没理解。这个 in 前面的 this 对应的就是(self)吗?

    @abcyuxue123 去掉 self 是运行不了的,会提示 this 没有定义
    NxiJSiOS
        5
    NxiJSiOS  
       2017-09-30 14:16:50 +08:00
    Since self is a struct you can ’ t create weak or unowned references. Instead, pass self to the closure or function that initialized the lazy variable.
    zenghaojim33
        6
    zenghaojim33  
    OP
       2017-09-30 14:50:38 +08:00
    @NxiJSiOS 貌似明白了点,就是在 struct 里面直接使用 self 的话会报错必须这样传进去?
    engHacker
        7
    engHacker  
       2017-09-30 15:06:51 +08:00 via iPhone
    showme1121
        8
    showme1121  
       2017-09-30 22:00:26 +08:00 via iPhone
    @zenghaojim33 this 是整个 closure 的参数啊
    zenghaojim33
        9
    zenghaojim33  
    OP
       2017-10-01 16:29:03 +08:00
    @showme1121 但是( self )又是什么
    airdrop
        10
    airdrop  
       2017-10-11 17:30:11 +08:00
    closure 的调用吧
    shawndev
        11
    shawndev  
       2017-10-15 12:06:18 +08:00
    lazy var button : UIButton = {
    $0.hide = true
    }(UIButton())

    和这种写法是一样的
    zenghaojim33
        12
    zenghaojim33  
    OP
       2017-10-16 18:47:59 +08:00
    @shawndev 明白了,那如果把 UIButton()放到闭包里面是不是一样的?
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