swift_005（Swift的Dictionary 字典）

1.Dictionary （可变不可变不区分了）字典《Swift开发指南》

// Swift 字典的key没有类型限制可以是整型或字符串，但必须是唯一的。

var someDict:[Int:String] = [1:"One", 2:"Two", 3:"Three"]

//(1)创建一个字典

var dic:Dictionary<String,String>=["三国演义":"罗贯中","水浒传":"施耐庵","红楼梦":"曹雪芹"];

//(2)向字典中添加键值 "西记":"吴承恩"

dic["吴承恩”]="西记"

//(3)修改

dic.updateValue("西游记",forKey:"吴承恩")

//(4)删除

dic.removeValueForKey("吴承恩")

//(5)遍历 for in 字典会以元组(键，值)的形式返回

for (key,value) in dic {

print("键:\(key) 值:\(value)");

}

// 元组

for tuples in dic {

print("键:\(tuples.0) 值:\(tuples.1)");

}

for key in dic.keys

{

print("key=:\(key)");

}

for value in dic.values

{

print("value=:\(value)");

}

//(6)通过构造方法创建字典

var namesOfIntegers = Dictionary<String, String>()

namesOfIntegers = dic

print("\(namesOfIntegers)")

/*******************字典的基本使用**************************/

// Swift 字典的key没有类型限制可以是整型或字符串，但必须是唯一的。

var someDict:[Int:String] = [1:"One", 2:"Two", 3:"Three"]

var removedValue = someDict.removeValue(forKey: 2)

print( "key = 1 的值为 \(someDict[1]!)" )

print( "key = 2 的值为 \(someDict[2])" )

print( "key = 3 的值为 \(someDict[3])" )

let testMutable:Bool = false

if !testMutable {

// 可变字典的基本使用

let mutable : NSMutableDictionary = NSMutableDictionary()

// add objects

mutable.setObject("Tom", forKey: "tom@jones.com" as NSCopying)

mutable.setObject("Bob", forKey: "bob@dole.com" as NSCopying)

mutable["lucy@163.com"] = "Lucy"

print("可变字典-----%@", mutable.description)

let keys = mutable.allKeys

for item : Any in keys {

let key = item as! String

print("%@ - %@", key, mutable.object(forKey: key) as! NSString)

}

}else {

// 不变字典的基本使用

let keyString : String = "one two three four five"

let keys : Array = keyString.components(separatedBy: " ")

let valuestring : String = "alpha bravo charlie delta echo"

let values : Array = valuestring.components(separatedBy: " ")

let dict : NSDictionary = NSDictionary(objects: values as [AnyObject], forKeys:keys as [NSCopying] )

print("******dict********\(dict)")

let value:NSString = dict.object(forKey: "three") as! NSString

NSLog("three = %@", value)

let dict1 : NSDictionary = NSDictionary.init(object: values, forKey: keys as NSCopying)

print("*******dict1*******\(dict1)")

let keys1 = dict.allKeys

for item : Any in keys1 {

let key = item as! NSString

print("%@ - %@", key, dict.object(forKey: key) as! NSString)

}

/******************Dictionary*************/

var submitDic:Dictionary<String,String>=["userName":"muyu07","password":"123456"]

submitDic.updateValue("MUYU07", forKey: "userName")

submitDic["inviteCode"] = "CJ10001"

print(submitDic)

// 三、NSDictionary与Dictionary之间的关系

// NSDictionary与Dictionary之间的关系如同NSArray与Array之间的关系，Swift在底层能够将它们自动地桥接起来，一个NSDictionary对象桥接之后的结果是[NSObject : AnyObject]字典（值为NSObject 类型，键为AnyObject 类型的Dictionary字典）。

let keyString1 : NSString = "one two three four five"

let keys1 : Array = keyString1.components(separatedBy: " ")

let valueString1 : NSString = "alpha bravo charlie delta echo"

let values1 : Array = valueString1.components(separatedBy: " ")

let foundationDict:NSDictionary = NSDictionary(objects:values1 as [AnyObject],forKeys:

keys1 as [NSCopying])

let swiftDict:Dictionary = foundationDict as Dictionary

print("swiftDict.description-----\(swiftDict.description)")

let keys3 = swiftDict.keys

for item : AnyObject in keys3 {

let key = item as! NSString

print("key:%@ --value:%@",key,swiftDict[key]);

}

var hues = ["Heliotrope": 296, "Coral": 16, "Aquamarine": 156]

print(hues["Coral"])

// Prints "Optional(16)"

print(hues["Cerise"])

//************** 概览 **************

let swiftDict001 :Dictionary<String,String>= ["key1":"value1","key2":"value2"]

let nsDict001 :NSDictionary = swiftDict001 as NSDictionary

nsDict001.allKeys //["key1", "key2"]

nsDict001.allKeys(for: "value1") //["key1"]

nsDict001.allValues //["value1", "value2"]

//NSDictionary转换为Dictionary后，在输出时需要指定成员类型为AnyObject类型--不指定，Swift也能识别

let swiftDict002 = nsDict001 as Dictionary

for (key2, value2)in swiftDict002 {

print("\(key2):\(value2)")

}

for (key, value)in swiftDict002 {

print("\(key):\(value)")

}

//========== NSDictionary初始化 ==========

let nsDict003 = NSDictionary(object:"value1", forKey:001 as NSCopying)

let nsDict004 = NSDictionary(objects: ["value1","value2"], forKeys: [001 as NSCopying,002 as NSCopying])//一次性创建多个

let swiftDict003 = ["A":"value1","C":"value3","B":"value2"]

let nsDict005 = NSDictionary(dictionary:swiftDict003)

//========== NSDictionary常用的属性和方法 ==========

//获得成员个数

swiftDict002.count

nsDict001.count

//获取Key或Value组成的数组(swift Dictionary无此方法)

nsDict001.allKeys

nsDict001.allValues

//使用keysSortedByValueUsingComparator方法将key排序,获得新数组(swiftDictionary无此方法)

let sortKeys = nsDict005.keysSortedByValue(comparator: {($0 as! String).compare($1 as! String)})

print("\(sortKeys)") //[A, B, C]---由小到大排序

//获得单一键值(swift Dictionary无此方法)

nsDict005.object(forKey: "A")! //"value1"

nsDict005["A"]! //"value1"

swiftDict003["A"]

//获得多个键值(swift Dictionary无此方法)

nsDict005.objects(forKeys: ["A","D","B"],notFoundMarker:"NotFound") //["value1","NotFound", "value2"]

swiftDict003["A"]

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