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调用可以被链接在一起形成一个链，如果任何一个节点为空（nil","chang","charact","character.kind","character.kind是character.kind型，所以character.kind中的所有成员值都可以使用switch","character1","character2","characterpluscharact","characterplusstr","characters)字符串字面量初始化空字符串字符串可变性字符串是值类型使用字符(characters)计算字符数量连接字符串和字符字符串插值比较字符串字符串相等前缀/后缀相等大写和小写字符串unicodeunicod","charactertofind","character添加了一个新的计算实例属性，即kind，用来返回合适的kind","character添加了新的嵌套枚举。这个名为kind","check","checker","chees","chesnei","choosestepfunct","choosestepfunction(backward","choosestepfunction(currentvalu","choosestepfunction的函数，它的返回类型是(int","chri","citi","citizen","city!)的方式，将country的capitalcity属性声明为显示展开的可选类型属性。这表示像其他可选类型一样，capitalcity属性的默认值为nil","city(nam","city的构造函数有一个country实例的参数，并且将实例保存为countri","class","class)、结构体(structures)和枚举(enumerations)这些目标中，可以认为是访问对象、集合或序列的快捷方式。举例来说，用下标访问一个数组(arrai","class=\"x-name\">check","class_protocol","class前添加@final特性（@fin","class类型。它创建了一个可以存储ani","class）来将整个类标记为fin","closur","club","cm","cocoa","cocoa的基础上构建框架栈并将其标准化。objective-c","cocoa里的nslog函数一样，println","code","code-block","codeunit","coin","coinsinbank","coinsinpurs","col0","col1","collect","collection)，列表(list)或序列(sequ","colspan=\"4\">4</td","column","columns个数的double类型数组。为了存储，将数组的大小和数组每个元素初始值0.0，都传入数组的构造方法中来创建一个正确大小的新数组。关于数组的构造方法和析构方法请参考cr","come","comment","common","compasspoint","compasspoint.west","compile-tim","completedlevel(level","compound","comput","computedtypeproperti","concept","condit","condition(item","condition的值在statements执行前就已计算出，因此while语句中的stat","condition表达式的值是在statements表达式执行后才计算出，因此do-while语句中的stat","condition表达式的值的类型必须符合logicvalue协议。同时，condit","confid","conform","conformance</span","conson","constant","constantnam","constantstr","constraints][8","contain","container协议声明了一个itemtype的关联类型，写作typealia","container协议的例子，定义了一个itemtyp","container协议的泛型stack","container协议的类型必须指定存储在其里面的值类型，必须保证只有正确类型的items可以加进容器里，必须明确可以通过其下标返回item","container协议需要一个方法指定容器里的元素将会保留，而不需要知道特定容器的类型。container协议需要指定任何通过append","containsave","containscharact","containscharacter(#str","containscharacter(str","content","contentheight","context","continu","continue-stat","continue语句用于终止循环中当前迭代的执行，但不会终止该循环的执行。使用continue语句时，可以只写continue这个关键词，也可以在continue后面跟上标签名(label","continue语句的例子，请参考控制流待添加链接一章的continu","control","control-transfer-stat","convert","convertednumb","convertedrank","convertedrank.simpledescript","cope","correspond","count","count(\"som","count(str","countel","countelements(str","countelements(stringtoprint","countelements(unusualmenageri","counter","counter'","counter.incr","counter.incrementby(2","counter.incrementby(5","counter.reset","counter的例子(count","counter的替换版本（它定义了一个更复杂的incrementbi","counter这个类还声明了一个可变属性count","countri","country(nam","country.capitalcity.nam","country和city的实例，而不产生循环强引用，并且capitalc","country和city，每个类将另外一个类的实例保存为属性。在这个模型中，每个国家必须有首都，而每一个城市必须属于一个国家。为了实现这种关系，country类拥有一个capitalcity属性，而city类有一个countri","country的构造函数调用了city的构造函数。然而，只有country的实例完全初始化完后，country的构造函数才能把self传给c","count函数来处理任何一个字符串，返回的值将是一个包含三个int型值的元组（tupl","count属性获取容器里items的数量，并返回一个int","cow","creat","creditcard","creditcard(numb","cuatro","cuboid","cuboid(width","cuboid的结构体，表示三维空间的立方体，包含width、height和depth属性，还有一个名为volume的只读计算属性用来返回立方体的体积，设置volume的值毫无意义，因为无法确定width、height和depth","cucumb","current","currentlevel","currentlevel值大于任何之前任意audiochannel实例中的值，属性监视器将新值保存在静态属性maxinputlevelforallchannel","currentlevel包含didset","currentlevel属性，leveltracker定义了实例方法advancetolevel。这个方法会在更新currentlevel之前检查所请求的新等级是否已经解锁。advancetolevel方法返回布尔值以指示是否确实能够设置currentlevel","currentlevel的新值大于允许的阈值thresholdlevel，属性监视器将currentlevel的值限定为阈值thresholdlevel","currentloginattempt","currentvalu","currentvalue逐渐接近到0是需要向正数走还是向负数走。currentvalue的初始值是3，这意味着currentvalu","curtiz","custom","customer(nam","customer和creditcard","customer和creditcard之间的关系与前面弱引用例子中apartment和person的关系截然不同。在这个数据模型中，一个客户可能有或者没有信用卡，但是一张信用卡总是关联着一个客户。为了表示这种关系，customer类有一个可选类型的card属性，但是creditcard类有一个非可选类型的custom","customer和creditcard的例子展示了一个属性的值允许为nil，而另一个属性的值不允许为nil","customer实例持有对creditcard实例的强引用，而creditcard实例持有对custom","customer实例的强引用，该实例被销毁了。其后，再也没有指向creditcard","customer的无主引用，当你断开john变量持有的强引用时，再也没有指向custom","customer类的实例，用它初始化creditcard实例，并将新创建的creditcard实例赋值为客户的card","cycl","c中的比较运算都可以在swift","c和objective-c","c和objective-c一样，swift的枚举成员在被创建时不会被赋予一个默认的整数值。在上面的compasspoints例子中，north，south，east和west不是隐式得等于0，1，2和3。相反的，这些不同的枚举成员在compasspoint","c的兼容性的限制。swift","c语言和objective-c","c语言，你就会知道，在c语言中枚举指定相关名称为一组整型值。swift中的枚举更加灵活，不必给每一个枚举成员（enumer","d","dai","daniella","data","data.txt","dataimport","dataimporter和datamanag","datamanag","datamanager也可以不从文件中导入数据，所以当datamanager的实例被创建时，就没有必要创建一个dataimporter的实例。同时，更有意义的是当用到dataimport","datamanager的一个功能是从文件导入数据，该功能由dataimport","datamanager类包含一个名为data的存储属性，初始值是一个空的字符串（string）数组。虽然没有写出全部代码，datamanag","dave","dc","decimalbas","decimaldoubl","decimalinteg","declar","deduc","default","default-label","defaultrect","defin","definit","definitestr","deinit","deiniti","deinit来标示析构函数，类似于初始化函数用init","deltai","deltax","deni","depth","describ","descript","diamond","dictionari","d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