无意中遇到一个问题，项目中使用UIWebView打不开web界面，检查过URL和代码，发现并没有问题。随考虑到一点：URL中包含汉字。
处理如下：
NSString *URLString = [NSString stringWithFormat:@"%@id=%@&email=%@",ProviderOrder,self.orderID,emailStr];
//方法是用来进行转码的，即将汉字转码
NSString *encodedString1 = [URLString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
//该方法用来进行转码的，即将汉字转码（在Xcode7中，iOS9）
//NSString *encodedString = [URLString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url =[NSURL URLWithString:[NSString stringWithFormat:@"%@",encodedString1]];
self.webView = [[UIWebView alloc]initWithFrame:self.view.bounds];
self.webView.delegate = self;
NSURLRequest *request = [NSURLRequest requestWithURL:url ];
[self.webView loadRequest:request];
[self.view addSubview:self.webView];
上面为什么推荐使用
(NSString *)stringByAddingPercentEncodingWithAllowedCharacters:(NSCharacterSet *)allowedCharacters,
这里是文档中给出的解释：
其一：
Use -stringByAddingPercentEncodingWithAllowedCharacters: instead,
which always uses the recommended UTF-8 encoding,
and which encodes for a specific URL component or subcomponent since each URL component or subcomponent has different rules for what characters are valid.
翻译如下：
使用-stringByAddingPercentEncodingWithAllowedCharacters：改为，
它总是使用推荐的UTF-8编码，
并且其对特定的URL组件或子组件进行编码，因为每个URL组件或子组件对于什么字符是有效的具有不同的规则。
其二：
Returns a new string made from the receiver by replacing all characters not in the allowedCharacters set with percent encoded characters.
UTF-8 encoding is used to determine the correct percent encoded characters.
Entire URL strings cannot be percent-encoded.
This method is intended to percent-encode an URL component or subcomponent string, NOT the entire URL string.
Any characters in allowedCharacters outside of the 7-bit ASCII range are ignored.
翻译如下：
通过替换不在allowedCharacters中的所有字符，使用百分比编码字符返回从接收器创建的新字符串。 UTF-8编码用于确定正确的百分比编码字符。 整个URL字符串不能进行百分号编码。 此方法旨在对URL组件或子组件字符串（而不是整个URL字符串）进行百分比编码。 将忽略7位ASCII范围之外的allowedCharacters中的任何字符。
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