[学习]OC-NSString去掉两边的空格，查找字符串出现的位置,获取远程URL 内容

 //获取远程URL 内容
 
    NSString * s =[NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.baidu.com"] encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@",s);
 
    NSString * rangeStr = @" yangiqjun-123 ";
    rangeStr  = [rangeStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];//去首尾空格
    
    
    NSRange rang  = [rangeStr rangeOfString:@"123" ];
    NSLog(@"%@",NSStringFromRange(rang));