每一个String值都有相关的索引类型String.Index,它用于表示每个Character在字符串中的位置。 startIndex属性表示String中第一个Character的位置;endIndex表示String中最后一个字符后面的那个位置。 endIndex属性并不是字符串下标脚本的合法实际参数。 如果String为空,则String和endIndex相等。
字符串是一系列角色,如"hello,world"或"albatross"Swift字符串由String类型表示。String的内容可以通过各种方式访问,包括作为Character值的集合。 Swift的String和Character类型提供了一种快速、符合Unicode的方式来处理代码中的文本。字符串创建和操作的语法轻巧且可读,字符串文字语法与C相似。字符串串联就像将两个字符串与...
// SwiftfuncinteractWith(foo:Foo) -> (String,Any) {varstring ="string"asNSString// explicit conversionfoo.updateString(&string)// parameter imports as UnsafeMutablePointer<NSString>letfinishedString = stringasStringvarobject ="string"asAnyObjectfoo.updateObject(&object)// parameter imports as Uns...
例如，假设有一个字符串扩展方法将第一个字母大写：extensionString{funcuppercasedFirst()->String{letf...
print( "stringA 不是空的" ) } // 实例化 String 类来创建空字符串 let stringB = String() if stringB.isEmpty { print( "stringB 是空的" ) } else { print( "stringB 不是空的" ) } 1. 2. 3. 4. 5. 6. 7. 8. 9.
letmaximumNumberOfLoginAttempts =10varcurrentLoginAttempt =0// 类型注解varwelcomeMessage:String 注释 单行注释双正斜杠(//), 多行注释(/* 多行的 */)。 Swift 的多行注释可以嵌套在其它的多行注释之中。 示例: // 这是一个注释/* 这也是一个注释, ...
Avoid any risk of typo when using a String Free auto-completion Avoid the risk of using a non-existing asset name All this will be ensured by the compiler and thus avoid the risk of crashing at runtime.Also, it's fully customizable thanks to Stencil templates, so even if it comes with...
A word-boundary character are all capital characters, characters preceded by an underscore and the first letter character in the completion string.General Semantic CompletionYou can use Ctrl+Space to trigger the completion suggestions anywhere, even without a string prefix. This is useful to see ...
Crayon - Terminal string styling with expressive API and 256/TrueColor support. Guaka - The smartest and most beautiful (POSIX compliant) command line framework for Swift. ModuleInterface - Command Line Tool that generates the Module's Interface from a Swift project. nef - Command line tool to...
struct Person{ var firstName, lastName: String mutating func setFirstNameTo(firstName: String){ self.firstName = firstName } } This structure has a method that can cause the structure to mutate, so it is prefixed with the keyword mutating. Now we can create a function that can change ...