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","objc特性应用于一个类或协议，它也会隐式地应用于那个类或协议的成员。对于标记了objc特性的类，编译器会隐式地为它的子类添加objc特性。标记了objc特性的协议不能继承自没有标记objc","objc特性有一个可选的参数，由标记符组成。当你想把objc所修饰的实体以一个不同的名字暴露给objective-c，你就可以使用这个特性参数。你可以使用这个参数来命名类，协议，方法，getters，setters，以及初始化器。下面的例子把exampleclass中enabled属性的getter暴露给objective-c，名字是isen","objc用来表示协议是可选的，也可以用来表示暴露给objective-c的代码，此外，@objc型协议只对类有效，因此只能在类中检查协议的一致性。详情查看us","object","objective-c","objective-c中表示的声明，比如，非嵌套类，协议，类和协议中的属性和方法（包含getter和setter），初始化器，析构器，以下下标。objc特性告诉编译器该声明可以在objective-c","objective-c，swift","objectivei-c","objects数组中元素的类型并不会因为向下转型而改变，当它们被赋值给objectwitharea时只被视为hasarea类型，因此只有area","objectwitharea","objectwitharea.area","object属性标记了，class_protocol属性就隐性地应用于该协议；没有必要再明确地使用class_protocol","object数组的元素是否遵循了hasarea","observ","observer），这样一来，当属性值改变时，类就会被通知到。可以为任何属性添加属性观察器，无论它原本被定义为存储型属性（stor","occup","occupations[\"jayn","octalinteg","odyssei","ok","old","oldvalu","on","onebacon","oneinch","onemillion","onemysteryitem","onesix","onoffswitch","onoffswitch.off","onoffswitch枚举遵循了togglable协议，on，off","oper","operator)是一元运算符，例如表达式++i","operator)是一元运算符，例如表达式i","operators）主表达式（primari","operators）比较运算三元条件运算(ternari","operators）的更多信息，请参见：bas","operator和运算符之间添加上下文关键字infix，prefix或postfix来指定。每种形式中，运算符的名字只能包含oper","operator）、后缀运算符（postfix","operator）三元条件运算符（ternari","operator）或二元运算符（binari","operator）类型转换运算符（type-cast","opt","option","optional<t>是一个枚举，有两种形式，none和some(t)，又来代表可能出现或可能不出现的值。任意类型都可以被显式的声明（或隐式的转换）为可选类型。当声明一个可选类型时，确保使用括号给?提供合适的作用范围。比如说，声明一个整型的可选数组，应写作(int[])?，写成int","optional-chain","optional<int","optionalinteg","optionalnam","optionalname改成nil，greeting会是什么？添加一个else语句，当optionalname是nil时给greet","optionalsquar","optionalsquare?.sidelength","optionalstr","optionals）。把想要用作可选的类型的后面的问号（string?）改成感叹号（str","optionalvalue<int","optionalvalue<t","optional属性标注这些协议成员声明以指定它们的一致性类型实现是可选的。optional属性仅仅可以用于使用objc属性标记过的协议。这样的结果就是仅仅类类型可以采用并符合包含可选成员要求的协议。更多关于如何使用opt","optional特性修饰那些标记了objc特性的协议。因此，只有类类型可以adopt和comform","orang","orangesareorang","orangesareorange和turnipsaredelicious的类型会被推断为bool，因为它们的初值是布尔字面量。就像之前提到的int和double一样，如果你创建变量的时候给它们赋值true或者false，那你不需要将常量或者变量声明为bool","orchard","origin","origin.i","origin.x","originalstr","origini","originrect","originx","origin的x和i","orson","os","other","otherbit","otherwis","ottawa","out","output","outputbit","outsid","ovenlight","ovenlight.next","over","overflow","overload","overrid","override关键字。这么做，你就表明了你是想提供一个重写版本，而非错误地提供了一个相同的定义。意外的重写行为可能会导致不可预知的错误，任何缺少overrid","override关键字作为函数声明头。不用override关键字重写的方法，使用了overrid","override标记——如果没有添加override就重写父类方法的话编译器会报错。编译器同样会检测overrid","overrrid","p","p>表示泛型类型t继承自类c且遵守协议p","p></p","p>hello","pad","paddeddoubl","paddedstr","paint","pair","pairs）。遍历字典时，字典的每项元素会以(kei","paragraph","paragraph变量为nil，打破它持有的htmlelement实例的强引用，htmlel","paragraph变量定义为可选htmlelement，因此我们可以赋值nil","parakeet","paramet","parameter)，不支持默认参数(default","parameter-claus","parameternam","parameters"","parameters)或返回类型(return","parameters)指定一个或多个用于在相关类型的下标脚本中访问元素的索引（例如，表达式object[i]中的i）。尽管用于元素访问的索引可以是任意类型的，但是每个变量必须包含一个用于指定每种索引类型的类型标注。返回类型(return","parameters）函数类型（funct","parameters）常量参数和变量参数（const","parameters）无参函数（funct","parameters）无返回值函数（funct","parameters）输入输出参数（in-out","parent","parenthes","passedretinascan","passeng","pattern","pattern-matched)的，和其相反的是switch语句case块中枚举事件匹配，在枚举事件类型(enumer","patterns）表达式模式（express","patterns）通配符模式（wildcard","pattern）代表了单个值或者复合值的结构。例如，元组(1","pattern）值绑定模式（value-bind","pattern）元组模式（tupl","pattern）和元组模式（tupl","pattern）枚举用例模式（enumer","pattern）标识符模式（identifi","pattern）类型转换模式（type-cast","pattern），标识符模式（identifi","peiyucn","penguin","pepper","performact","perimet","person","person'","person(fullnam","person(nam","person?的变量，用来按照代码片段中的顺序，为新的person实例建立多个引用。由于这些变量是被定义为可选类型（person?，而不是person），它们的值会被自动初始化为nil，目前还不会引用到person","personnam","person和apart","person和apartment实例并将类实例赋值给john和number73","person和apartment的例子一致，但是有一个重要的区别。这一次，apartment的ten","person和apartment的例子展示了两个属性的值都允许为nil","person和resid","person和residence模型通过添加一个room和一个address","person实例依然保持对apartment实例的强引用，但是apartment实例只是对person实例的弱引用。这意味着当你断开john变量所保持的强引用时，再也没有指向person","person实例有一个类型为string，名字为name的属性，并有一个可选的初始化为nil的apartment属性。apart","person实例现在有了一个指向apartment实例的强引用，而apartment实例也有了一个指向person实例的强引用。因此，当你断开john和number73","person实例的引用数量，并且会在person","person实例，它的resid","person实例，这也意味着你不再使用这个person","person类开始，并定义了一个叫nam","person类有一个构造函数，此构造函数为实例的name属性赋值并打印出信息，以表明初始化过程生效。person","person类的新实例被赋值给了reference1变量，所以reference1到person类的新实例之间建立了一个强引用。正是因为这个强引用，arc","person类的构造函数的时候，"john","person结构体含有一个名为fullnam","peter","pi","piec","pink","pixel","place","plai","plane","planet","planet.earth","planet.earth.toraw","planet.fromraw(7","planet.fromraw(9)语句获得一个可选planet，如果可选planet可以被获得，把someplanet设置成该可选planet的内容。在这个范例中，无法检索到位置为9的行星，所以els","planet.fromraw(positiontofind","planet.uranu","planet.venus的原始值是2","player","player(coin","player(nam","player.completedlevel(1","player.tracker.advancetolevel(6","playernam","playeron","playerone!.coinsinpurs","playerone!.wincoins(2_000","playerone变量设置为nil，意思是“没有player实例”。当这种情况发生的时候，playerone变量对player实例的引用被破坏了。没有其它属性或者变量引用play","playerone是可选的，所以由一个感叹号（!）来修饰，每当其wincoins方法被调用时，coinsinpurs","player实例存储在一个名为playerone的可选play","player类使用leveltrack","player类创建一个新的leveltracker实例来监测这个用户的发展进度。它提供了completedlevel方法：一旦玩家完成某个指定等级就调用它。这个方法为所有玩家解锁下一等级，并且将当前玩家的进度更新为下一等级。（我们忽略了advancetolevel返回的布尔值，因为之前调用leveltracker.unlocklevel","player类定义了一个wincoins方法，该方法从银行获取一定数量的硬币，并把它们添加到玩家的钱包。player类还实现了一个析构函数，这个析构函数在play","pleas","plu","plusminusvector","plusthre","pm","point","point(x","point.0","point.1","pointonefouronefivenin","point封装了一个(x","point来引用元组(int","point来表示square的中心点。如代码所示，它正确返回了中心点(5","point结构体定义了一个变异方法（mut","point（x","pop","pop并移除值"cuatro"","pop方法的返回值，该返回值将是一个t","posit","positiontofind","possibl","possibleinteg","possibleintegervalu","possiblenumb","possiblenumber.toint","possiblenumber.toint返回的可选int包含一个值，创建一个叫做actualnumb","possibleplanet","possiblestr","postfix","potentialoverflow","powder","power","pp-prog","pp-prog告诉我，这几天太累了，校对到一半睡着了，醒来又继续做。2点17","preced","precedence、prefix、right、set、unowned、unowned(safe)、unowned(unsafe)、weak、willset","precedence并优先级(preced","prefix","prefix存在时，将prefix插入到name之前来为starship构建fullnam","prefix）表达式，二元（binary）表达式，主要（primary）表达式和后缀（postfix）表达式。表达式可以返回一个值，以及运行某些逻辑（caus","preslei","prettytextrepresent","prettytextrepresentable协议的同时，也需要遵循textrepresent","prettytextrepresentable协议继承了textrepresent","preview","previewpreced","primari","prime","print","print(\"\\(codeunit","print(\"\\(scalar.valu","print(\"\\n","print(\"conson","print(\"oth","print(\"vowel","printandcount","printandcount(\"hello","printandcount(stringtoprint","printclassnam","printhelloworld","printletterkinds(\"hello","printletterkinds(word","printletterkinds的输入是一个string值并对其字符进行迭代。在每次迭代过程中，考虑当前字符的kind计算属性，并打印出合适的类别描述。所以printletterkinds就可以用来打印一个完整单词中所有字母的类型，正如上述单词"hello"","println","println(\"'\\\\(word","println(\"(0","println(\"(\\(point.0","println(\"(\\(somepoint.0","println(\"(\\(x","println(\"3的6倍是\\(threetimestable[6","println(\"\\(airportcod","println(\"\\(animalname)","println(\"\\(bas","println(\"\\(country.name)'","println(\"\\(currentvalu","println(\"\\(index","println(\"\\(mansioncount","println(\"\\(nam","println(\"\\(possiblenumb","println(\"\\(scalar","println(\"\\(somecharact","println(\"\\(total.vowel","println(\"a","println(\"about","println(\"access","println(\"ad","println(\"airport","println(\"al","println(\"an","println(\"and","println(\"apart","println(\"area","println(\"automaticcar","println(\"b","println(\"bicycl","println(\"car","println(\"card","println(\"cinema","println(\"count","println(\"eww","println(\"gam","println(\"goodby","println(\"happi","println(\"hd","println(\"hello","println(\"here'","println(\"highest","println(\"i'm","println(\"index","println(\"it","println(\"it'","println(\"item","println(\"john'","println(\"level","println(\"lot","println(\"media","println(\"mmm","println(\"mostli","println(\"movi","println(\"not","println(\"on","println(\"play","println(\"playeron","println(\"qr","println(\"random","println(\"result","println(\"rol","println(\"som","println(\"somebaseclass","println(\"someint","println(\"somesubclass","println(\"someth","println(\"somewher","println(\"song","println(\"speedlimitedcar","println(\"square.origin","println(\"start","println(\"tandem","println(\"tentighti","println(\"th","println(\"that","println(\"theaceofspad","println(\"ther","println(\"thes","println(\"thi","println(\"thre","println(\"un","println(\"unusualmenageri","println(\"upc-a","println(\"watch","println(\"welcom","println(\"wher","println(\"zero","println(a[0","println(ages[\"pet","println(assumedstr","println(audiochannel.maxinputlevelforallchannel","println(b[0","println(board.squareisblackatrow(0","println(board.squareisblackatrow(9","println(c[0","println(cat","println(charact","println(counter.count","println(d12.astext","println(definitestr","println(descript","println(friendlywelcom","println(game.asprettytext","println(game.astext","println(halfopenrangelength(1","println(item","println(item.descript","println(leftchannel.currentlevel","println(manager.importer.filenam","println(messag","println(name[0","println(paragraph!.ashtml","println(possiblestr","println(puzzleoutput","println(rightchannel.currentlevel","println(sayhello(\"anna","println(sayhello(\"brian","println(sayhelloagain(\"anna","println(sayhelloworld","println(someclass.computedtypeproperti","println(somestructure.storedtypeproperti","println(somethingtextrepresentable.astext","println(stringtoprint","println(text","println(thing.astext","println(“th","println函数输出传入的str","println（\"somebaseclass","println（\"somesubclass","printmathresult","printmathresult(addtwoint","printmathresult(mathfunct","printnumberofroom","prints\"hello","printwithoutcount","printwithoutcounting(\"hello","printwithoutcounting(stringtoprint","print（parent!.titl","print（self!.titl","print（self.titl","privat","procotol","productbarcod","productbarcode的新变量，并且赋给它一个barcode.upca的相关元组值(8","productcod","program","properit","properti","p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