NSString is empty

Question

How do you test if an NSString is empty? or all whitespace or nil? with a single method call?

Answer 1

Should be easier:

if (![[string stringByReplacingOccurencesOfString:@" " withString:@""] length]) { NSLog(@"This string is empty"); }

Answer 2

Based on the Jacob Relkin answer and Jonathan comment:

@implementation TextUtils

    + (BOOL)isEmpty:(NSString*) string {

        if([string length] == 0 || ![[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length]) {
            return YES;
        }

        return NO;
    }

    @end