解决思路
（后记，昨天突然银联不行了 出现“invalid request”，各种修改各种失败，最后用线上的环境，竟然没问题，再次记录一下，修改证书应该也可以）
今天对接银联，需要以post的方式把网页加载上去，设置好之后，进行utf8转化，网上找的方法，各种失败（不能转化/:+），自己进行处理如下
NSURL *url = [NSURL URLWithString: response.data[@"requestUrl"]];//这个是后台（从接口获取）提供的
NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithDictionary: response.data[@"params"]];//提取数据，这个是后台（从接口获取）提供的
NSString *firstKey = dic.allKeys.firstObject;
NSString *body = [NSString stringWithFormat:@"%@=%@",firstKey,dic[firstKey]];
[dic removeObjectForKey:firstKey];
for (NSString *keyStr in dic.allKeys) {
body = [NSString stringWithFormat:@"%@&%@=%@",body,keyStr,dic[keyStr]];
[dic removeObjectForKey:keyStr];
}
NSMutableURLRequest* request = [[NSMutableURLRequest alloc]initWithURL:url];
body = [self encodeString:body];
NSData *data = [body dataUsingEncoding: kCFStringEncodingUTF8];
[request setHTTPBody:data];
[request setHTTPMethod:@"POST"];
UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.frame];
[webView loadRequest: request];
webView.scalesPageToFit =YES;
webView.delegate = self;
[self.view addSubview:webView];
-(NSString*)encodeString:(NSString*)unencodedString{
// CharactersToBeEscaped = @":/?&=;+!@#$()~',*";
// CharactersToLeaveUnescaped = @"[].";
NSString*encodedString=(NSString*)
// CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
//
// (CFStringRef)unencodedString,
//
// NULL,
//
// (CFStringRef)@"!*'();:@&=+$,/?%#[]",
//
// kCFStringEncodingUTF8));
CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(CFStringRef)unencodedString,
NULL,
(CFStringRef)@":/+",
kCFStringEncodingUTF8));
return encodedString;
}
