[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:@"https://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)); //获取远程URL 内容 NSString * s =[NSString stringWith