去空格 whitespaceAndNewlineCharacterSet

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1.去掉两端的空格

[cpp] view plaincopyprint?

1. [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]

2.去掉多余的空格

[cpp] view plaincopyprint?

1. NSString *str = @"    this     is a    test    .   ";
2. NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];
3. NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ‘‘"];
4. NSArray *parts = [str componentsSeparatedByCharactersInSet:whitespaces];
5. NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];
6. str = [filteredArray componentsJoinedByString:@" "];

3.去掉所有空格

[cpp] view plaincopyprint?

1. [str stringByReplacingOccurrencesOfString:@" " withString:@""]