iOS URLEcode

在进行webview链接跳转的时候会遇到链接中含有中文字符，这个时候我们需要编码中文字符，

- (NSString *)encodeChineseWordForURL {

NSCharacterSet *URLParamCharacterSet;

NSMutableCharacterSet *characterSet = [NSMutableCharacterSet new];

[characterSet formUnionWithCharacterSet:[NSCharacterSet URLQueryAllowedCharacterSet]];

[characterSet addCharactersInString:@"!*'();:@&=+$,/?#[]<>\"{}|\\`^% "];

URLParamCharacterSet = [characterSet copy];

return [self stringByAddingPercentEncodingWithAllowedCharacters:URLParamCharacterSet];

}