去除字符串中的空格

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1.去掉两端的空格

[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]   //stringByTrimmingCharactersInSet: 是将字符串str和集合共同的部分，从str中剪掉。

2.去掉多余的空格

NSString *str = @"    this     is a    test    .   ";      NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];  // 返回空格和tab    NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];      NSArray *parts = [str componentsSeparatedByCharactersInSet:whitespaces];      NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];      str = [filteredArray componentsJoinedByString:@" "];  // ［NSCharacterSet whitespaceAndNewlineCharacterSet ］返回的是空格和tab和回车

结果：this空格is空格a空格test.

3.去掉所有空格

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

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