类方法和实例方法的疑问。。。 - V2EX
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qlqsh
V2EX    iDev

类方法和实例方法的疑问。。。

  •  
  •   qlqsh Oct 12, 2013 4342 views
    This topic created in 4591 days ago, the information mentioned may be changed or developed.
    比如:
    NSArray *array = [[NSArray alloc] init];
    NSArray *array = [NSArray array];

    以前的时候是,一个需要自己释放,一个是自动释放。但现在ARC的环境下,是不是2个方法有点多余了呢。

    有哪位了解,在目前ARC的情况下,2者安全上、性能上有什么差别?

    苹果是不是考虑,可以放弃一个呢?这样的话,iOS的整体API能下降3成多吧?

    有哪位前辈,高人指点一下?
    4 replies    1970-01-01 08:00:00 +08:00
    fgwww
        1
    fgwww  
       Oct 12, 2013
    又不是所有的项目都上ARC了。你总得给人留条活路吧。一上来把这种最初的api都废弃掉你想让大家玩命改代码么?
    td width="auto" valign="top" align="left">
        2
    qlqsh  
    OP
       Oct 12, 2013
    这不是方向嘛。嘿嘿。。。
    qlqsh
    lldong
        3
    lldong  
       Oct 12, 2013
    第二个这种叫做 Shortcut Constructor Method

    What is the external interface for creating a new object when a Constructor Method is too wordy?

    Represent object creation as a message to one of the arguments to the Constructor Method. Add no more than three of these Shortcut Constructor Methods per system you develop.

    摘自 "Smalltalk Best Practice Patterns"
    nevercry
        4
    nevercry  
       Oct 12, 2013
    没区别吧,字越少的写法越喜欢 NSArray *array = @[];
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