//首字母大写
let temSting1 = "wo xiao wo ku"
print(temSting1.capitalized)
Wo Xiao Wo Ku
//全部转小写
let temSting2 = "COMpletion"
print(temSting2.lowercased())
completion
//全部转大写
let temSting3 = "compleTION"
print(temSting3.uppercased())
COMPLETION
//字符串d所包含字母个数,包括空格和其他
let temSting4 = "comple TION"
print(temSting3.underestimatedCount)
11
Swift - capitalize the first letter of a string and convert all cases
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Origin blog.csdn.net/SoftwareDoger/article/details/103407275
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