// Str = @"PEK_LHR"
NSRange range = [trafficeStr rangeOfString:@"_" options:NSBackwardsSearch];
from = [trafficeStr substringToIndex:range.location];
to = [trafficeStr substringFromIndex:range.location + 1];
本文共 207 字，大约阅读时间需要 1 分钟。
// Str = @"PEK_LHR"
NSRange range = [trafficeStr rangeOfString:@"_" options:NSBackwardsSearch];
from = [trafficeStr substringToIndex:range.location];
to = [trafficeStr substringFromIndex:range.location + 1];
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