解决URL非法

用方法处理

- (NSString *)URLEncodedString:(NSString*)urlStr
{
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                            (CFStringRef)urlStr,
                                            (CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",
                                            NULL,
                                            kCFStringEncodingUTF8));
    return encodedString;
}