String contains letters

问题

I'm wondering if there is a way to check if a string is containing a letter.

If there is an NSString = @"street 12" I want it to return YES and if NSString = @"12.12,23.23" I want it to return NO

Is there a method that handles this made by Apple or do I have to make it myself?

回答1:

Here's one way:

NSString *someString = ... // the string to check
NSRange match = [someString rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet] options:0 range:NSMakeRange(0, someString.length)];
if (match.location != NSNotFound) {
    // someString has a letter in it
}

回答2:

NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ"];

if ([str rangeOfCharacterFromSet:set].location != NSNotFound) {
    return YES;
}

return NO;

来源：https://stackoverflow.com/questions/16866879/string-contains-letters