如何知道一个字符串中的前五个字符

Question

I have an iPad app, where, if the TextField.text starts with 5 specific characters, it will do one thing, and else if it doesn't start with it, will do a different action. Any idea of how to know the 5 first characters of a NSString ?

Answer 1

Use this:

if ([someString hasPrefix:@"hello"]) { ... }

Or, if you want to find out what the first five characters are instead of comparing against a specific string, you can do this instead:

NSString *firstFive = [someString substringToIndex:MIN(5, [someString length])];