Objc生成搜索引擎查询字符串

拿baidu为例,百度的搜索url为:

http://www.baidu.com/s?wd=%s

%s表示可以用任何字符串来代替.

早期的NSString中有stringByAddingPercentEscapesUsingEncoding方法,不过新的SDK中已标记为废弃.不过所幸我们还有一个方法:

stringByAddingPercentEncodingWithAllowedCharacters:

比如我们要查询的关键字是:超人他爸爸,可以这样做:

NSString *name = @"超人他爸爸";
name = [name stringByAddingPercentEncodingWithAllowedCharacters:
[NSCharacterSet characterSetWithCharactersInString:@""]];
NSString *urlString = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@",
name];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];