CODEWITHSUNDEEP
iphonestring
Aram
Aram

Reputation: 83

How to check if my string starts with uppercase character

I'm working with cocoa on the iPhone and I'm looking for some method like:

NSString *s = @"Hello";

[s isStringStartsWithUpperCaseCharacter]

-(BOOL) isStringStartsWithUpperCaseCharacter;

The first letter of the string may be non ASCII letter like: Á, Ç, Ê...

Is there some method which can helps me?

I saw in the documentation that there are some methods to convert the string to uppercase and to lowercase but there are no methods for ask if the string is lowercase or uppercase.

Upvotes: 5

Views: 6984

Answers (5)

funroll
funroll

Reputation: 37113

Here's Nikolai's answer put into a block.

BOOL (^startsWithUppercase)(NSString *) = ^(NSString *string) {
    return [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[string characterAtIndex:0]];
};

Call it like this:

NSString *name = @"Mark";
if (startsWithUppercase(name)) { 
    // do something 
}

Another option would be to put it into a category on NSString.

Upvotes: -1

unknown
unknown

Reputation: 

return [myString rangeOfCharacterFromSet: [NSCharacterSet uppercaseLetterCharacterSet]].location==0;

This should work, but it is a costly way to solve this problem.

Upvotes: 1

Nikolai Ruhe
Nikolai Ruhe

Reputation: 81868

BOOL isUppercase = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[s characterAtIndex:0]];

Edit:

I'm not sure what's the difference between uppercaseLetterCharacterSet and capitalizedLetterCharacterSet. If someone finds out, please leave a comment!

2nd Edit:

Thanks, Ole Begemann, for finding out about the differences. I edited the code to make it work as expected.

Upvotes: 28

Kenny Winker
Kenny Winker

Reputation: 12107

first of all, if you just want to make the first character capitalized, try

- (NSString *)capitalizedString;

otherwise, you can use something like

NSString *firstCharacter = [s substringWithRange:NSMakeRange(0,1)];
if (firstCharacter != nil && [firstCharacter isEqualToString:[firstCharacter uppercaseString]]) {
//first character was capitalized
} else {
//first character was lowercase
}

Upvotes: -1

Mike Gleason jr Couturier
Mike Gleason jr Couturier

Reputation: 9186

I don't know Objective-C yet but you can put the first character in another string and "toupper" it... then compare it to the first character of the original string.. if they're equal, the first character is upper case.

Upvotes: -1

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