How to separate string by space using Objective-C?

问题

Assume that I have a String like this:

hello world       this may     have lots   of sp:ace or little      space

I would like to seperate this String to this:

@"hello", @"world", @"this", @"may", @"have", @"lots", @"of", @"sp:ace", @"or", @"little", @"space"

Thank you.

回答1:

NSString *aString = @"hello world       this may     have lots   of sp:ace or little      space";
NSArray *array = [aString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
array = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF != ''"]];

回答2:

I'd suggest a two-step aproach:

NSArray *wordsAndEmptyStrings = [yourLongString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSArray *words = [wordsAndEmptyStrings filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"length > 0"]];

回答3:

This has worked for me

NSString * str = @"Hi Hello How Are You ?";
NSArray * arr = [str componentsSeparatedByString:@" "];
NSLog(@"Array values are : %@",arr);

回答4:

It's very easy to do this with blocks, try something like this :

NSString* s = @"hello world       this may     have lots   of space or little      space";
NSMutableArray* ar = [NSMutableArray array];
[s enumerateSubstringsInRange:NSMakeRange(0, [s length]) options:NSStringEnumerationByWords usingBlock:^(NSString* word, NSRange wordRange, NSRange enclosingRange, BOOL* stop){
    [ar addObject:word];
}];

回答5:

NSString * mainString = @"Today is your day";
NSArray * array = [mainString componentsSeparatedByString:@" "];
NSLog(@"Expected string is : %@",array);

来源：https://stackoverflow.com/questions/4814641/how-to-separate-string-by-space-using-objective-c