Swift字典类

NSDictionary有很多方法和属性，下面总结其常用的方法和属性。

initWithDictionary:　构造器，通过Swift的Dictionary创建NSDictionary对象。

import Foundation


let keyString : NSString = "one two three four five"	①
var keys : NSArray = keyString.componentsSeparatedByString(" ")	②


let valuestring : NSString = "alpha bravo charlie delta echo"	③
var values : NSArray = valuestring.componentsSeparatedByString(" ")	④


vardict : NSDictionary = NSDictionary(objects: keys, forKeys:values)	⑤


NSLog("%@", dict.description)	⑥


varvalue:NSString = dict.objectForKey("three") as NSString	⑦
NSLog("three = %@", value)


varkys = dict.allKeys		⑧
for item : AnyObject in kys {	⑨
var key = item as NSString
NSLog("%@ - %@", key, dict.objectForKey(key) as NSString)
}

2014-07-06 20:19:07.274 PlaygroundStub_OSX[4110:303] {
five = echo;
four = delta;
one = alpha;
three = charlie;
two = bravo;
}
2014-07-06 20:19:07.281 PlaygroundStub_OSX[4110:303] three = charlie
2014-07-06 20:19:07.296 PlaygroundStub_OSX[4110:303] one - alpha
2014-07-06 20:19:07.300 PlaygroundStub_OSX[4110:303] five - echo
2014-07-06 20:19:07.305 PlaygroundStub_OSX[4110:303] three - charlie
2014-07-06 20:19:07.308 PlaygroundStub_OSX[4110:303] two - bravo
2014-07-06 20:19:07.313 PlaygroundStub_OSX[4110:303] four - delta

import Foundation


var mutable : NSMutableDictionary = NSMutableDictionary()	①
// add objects
mutable.setObject("Tom", forKey: "tom@jones.com")	②
mutable.setObject("Bob", forKey: "bob@dole.com")


NSLog("%@", mutable.description)


var keys = mutable.allKeys
for item : AnyObject in keys {
var key = item as NSString
NSLog("%@ - %@", key, mutable.objectForKey(key) as NSString)
}

2014-07-06 20:42:11.596 PlaygroundStub_OSX[4332:303] {
    "bob@dole.com" = Bob;
    "tom@jones.com" = Tom;
}
2014-07-06 20:42:11.605 PlaygroundStub_OSX[4332:303] bob@dole.com - Bob
2014-07-06 20:42:11.608 PlaygroundStub_OSX[4332:303] tom@jones.com – Tom

import Foundation				①


let keyString : NSString = "one two three four five"
let keys : NSArray = keyString.componentsSeparatedByString(" ")


let valueString : NSString = "alpha bravo charlie delta echo"
let values : NSArray = valueString.componentsSeparatedByString(" ")


let foundationDict : NSDictionary = NSDictionary(objects:values, forKeys:keys)	②


let swiftDict : Dictionary = foundationDict	③
println(swiftDict.description) 


let value: AnyObject? = swiftDict["three"]	④
println("three = \(value)") 


for (key, value) in swiftDict {	⑤
    println ("\(key) - \(value)")
}

第④行代码是从Dictionary字典取three键对应的值，它的类型是可选的AnyObject类型，这是因为有可能取不到这个值。第⑤行代码是遍历Dictionary字典键和值集合。

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Swift字典类

原文：http://blog.csdn.net/tonny_guan/article/details/39122955