iOS NSString 去空格

学到NSString ，今天把 去空格的笔记记下。

去两端的空格    

NSString *temp = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

去除两端空格和回车

NSString *text = [temp stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet ]];  

去掉所有的空格

  NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];    NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];    NSArray *parts = [theString componentsSeparatedByCharactersInSet:whitespaces];    NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];    theString = [filteredArray componentsJoinedByString:@""];    NSLog(@"thestring = %@",theString);

记录下方便以后使用。