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去除两端空格:
NSString *temp = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
去除两端空格和回车:
NSString *text = [temp stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet ]];
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原文地址：http://www.cnblogs.com/xvewuzhijing/p/4931227.html
