Swift 字串擷取 文字擷取

字串擷取

• startIndex 前面數來
• endIndex 後面數來

index offsetBy

let helloIndex = cutString.index(cutString.startIndex, offsetBy: 5)
print(String(cutString.suffix(from: helloIndex)))  
// -> " world"
print(String(cutString.prefix(upTo: helloIndex))) 
// -> "hello"

// 從後面數來 第-5個
let worldIndex = cutString.index(cutString.endIndex, offsetBy: -5)
print(String(cutString.suffix(from: worldIndex))) 
// -> "world"
print(String(cutString.prefix(upTo: worldIndex)))  
// -> "hello "

index before 取之前

// 在index之前
print(String(cutString.suffix(from: cutString.index(before: cutString.endIndex))))  
// -> ello world
print(String(cutString.prefix(upTo: cutString.index(before: cutString.endIndex))))  
// -> h

index after 取之後

// 在index之後
print(String(cutString.suffix(from: cutString.index(after: cutString.startIndex))))  
// -> ello world
print(String(cutString.prefix(upTo: cutString.index(after: cutString.startIndex))))  
// -> h

直接給index類型

print(String(cutString.prefix(5)))  
// -> "hello"
print(String(cutString[..<helloIndex])) 
// -> "hello"

取範圍 第2~3個

print((cutBugString as NSString).substring(with: NSMakeRange(2,3)))
// -> "llo"

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