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当明白 @UIApplicationMain 的内涵段子后，又发现一个神奇的东西
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
return true
}完全不适应呀，和之前的beta 版对比会发现社么呢？？？
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
// Override point for customization after application launch.
return true
}
瞬间疑问更多了，首先是看到官方的解释
哦，原来 AnyObject 是无类型的实例呀，准确来说 Any 是无类型的任何东西的实例，可以使基本数据类型、方法、闭包等
是不是想到了万能的 Id 指针、void 这些东西，而且官方还让在知道类型的时候，不用他们俩，必要时才推荐用。。。
哦，或许会明白 Any、AnyObject 这俩的概念了 [NSObject:AnyObject] 是啥东西，和 NSDictionary 有啥关系呢？
第一反应就是，前者可能是 后者的一种形式，查阅资料才明白，原来是。。。 XXX
字典的声明有这么多：
A： var creditDictionary = Dictionary<String,Int>()
B： var shorthandDictionary = [String:Int]()
C： var emptyDictionary = shorthandDictionary = [:] (空字典也可以这样 ~~ OMG ~~)
这样我们就可以简单的理解 [] 就是取 实例的对应的类，然后我们也会见到类似数组的声明
A： var intArray = Array<Int>()
B： var shorthandArray = [Int]()
C： shorthandArray = [] (这样够空的了。。)
更多关于Swift 中的 NSArray 、NSDictionary 详见喵神：
http://onevcat.com/2014/06/walk-in-swift/
那么对问题有了了解后，？ 是干嘛的呢，拆包呀，还有！ 呢
详情解释见 代码手工艺人 解释：
http://www.cocoachina.com/swift/20140605/8687.html
最后贴个官方的相关代码吧
AnyObject：
let someObjects: [AnyObject] = [
Movie(name: "2001: A Space Odyssey", director: "Stanley Kubrick"),
Movie(name: "Moon", director: "Duncan Jones"),
Movie(name: "Alien", director: "Ridley Scott")
]<pre name="code" class="html">for object in someObjects {
let movie = object as Movie
println("Movie: '\(movie.name)', dir. \(movie.director)")
}
// Movie: '2001: A Space Odyssey', dir. Stanley Kubrick
// Movie: 'Moon', dir. Duncan Jones
// Movie: 'Alien', dir. Ridley Scottfor movie in someObjects as [Movie] {
println("Movie: '\(movie.name)', dir. \(movie.director)")
}
// Movie: '2001: A Space Odyssey', dir. Stanley Kubrick
// Movie: 'Moon', dir. Duncan Jones
// Movie: 'Alien', dir. Ridley Scott
var things = [Any]()
things.append(0)
things.append(0.0)
things.append(42)
things.append(3.14159)
things.append("hello")
things.append((3.0, 5.0))
things.append(Movie(name: "Ghostbusters", director: "Ivan Reitman"))
things.append({ (name: String) -> String in "Hello, \(name)" })
for thing in things {
switch thing {
case 0 as Int:
println("zero as an Int")
case 0 as Double:
println("zero as a Double")
case let someInt as Int:
println("an integer value of \(someInt)")
case let someDouble as Double where someDouble > 0:
println("a positive double value of \(someDouble)")
case is Double:
println("some other double value that I don't want to print")
case let someString as String:
println("a string value of \"\(someString)\"")
case let (x, y) as (Double, Double):
println("an (x, y) point at \(x), \(y)")
case let movie as Movie:
println("a movie called '\(movie.name)', dir. \(movie.director)")
case let stringConverter as String -> String:
println(stringConverter("Michael"))
default:
println("something else")
}
}<pre name="code" class="html">for thing in things {
switch thing {
case 0 as Int:
println("zero as an Int")
case 0 as Double:
println("zero as a Double")
case let someInt as Int:
println("an integer value of \(someInt)")
case let someDouble as Double where someDouble > 0:
println("a positive double value of \(someDouble)")
case is Double:
println("some other double value that I don't want to print")
case let someString as String:
println("a string value of \"\(someString)\"")
case let (x, y) as (Double, Double):
println("an (x, y) point at \(x), \(y)")
case let movie as Movie:
println("a movie called '\(movie.name)', dir. \(movie.director)")
case let stringConverter as String -> String:
println(stringConverter("Michael"))
default:
println("something else")
}
}// zero as an Int // zero as a Double // an integer value of 42 // a positive double value of 3.14159 // a string value of "hello" // an (x, y) point at 3.0, 5.0 // a movie called 'Ghostbusters', dir. Ivan Reitman // Hello, Michael
其他相关
喵神贴
http://swifter.tips/any-anyobject/
官方资料
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原文地址：http://blog.csdn.net/skymingst/article/details/42156235
