iOS Swift 常用字串處理

var str = “Hello, I Love coding”

根據某字元取得Substring

let start = str.firstIndex(of: “I”) ?? str.startIndex
let end = str.endIndex
let range = start..<end
let mySubstring = str[range]
print(String(mySubstring))

根據某index取得Substring

let sindex = str.index(str.startIndex, offsetBy: 7)
let eindex = str.index(str.endIndex, offsetBy: -7)
let range = sindex..<eindex
let mySubstring = str[range]
print(String(mySubstring))

尋找字串中某段字串

let matchString = “Love”
let range = str.range(of: matchString)
if let range = range {
print(range.upperBound)
print(range.lowerBound)
print(str[range])
}