这是我迄今为止(用于测试目的)：
let string = "The quick BroWn fOX jumpS Over tHe lazY DOg"
for chr in string {
if isupper(String(chr)) {
print(String(chr).lowercaseString)
continue
}
print(chr)
}
如何测试大小写字符？
您可以随时查看小写表示与当前值的不同;
let string = "The quick BroWn fOX jumpS Over tHe lazY DOg"
var output = ""
for chr in string {
var str = String(chr)
if str.lowercaseString != str {
output += str
}
}
print(output)
>>> TBWOXSOHYDO
