iOS 字符串去掉空格换行符

    NSString* str=nil;

    //1. 去掉首尾空格和换行符

    str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    //2. 去掉所有空格和换行符

    str = [str stringByReplacingOccurrencesOfString:@"\r" withString:@""];

    str = [str stringByReplacingOccurrencesOfString:@"\n" withString:@""];