Code for Two Essential Buttons for iOS: Write a Review and Send a Letter To Developers

Code for Two Essential Buttons: Write a Review and Send a Letter To Developers. These buttons are often required in a mobile application to collect a feedback from users and to allow them write a review to your app more quickly and comfortable. It also includes some system information. It is in Russian, but no problem to translate it.

- (void)writeReviewClicked
{
  NSString *url = @"https://itunes.apple.com/ru/app/yourapp.ru/id662863746?mt=8";
	NSString *escapedUrl = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
	[[UIApplication sharedApplication] openURL:[NSURL URLWithString:escapedUrl]];
}

- (void)sendLetterClicked
{
  NSString *subject = [NSString stringWithFormat:@"%@ %@", @"Письмо от пользователя мобильного приложения", @"YourApp для iOS"];

  NSDate *today = [NSDate date];
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  dateFormatter.timeStyle = NSDateFormatterMediumStyle;
  dateFormatter.dateStyle = NSDateFormatterMediumStyle;
  NSString *todayString = [dateFormatter stringFromDate:today];

  NSMutableString *temp = [NSMutableString new];
  [temp appendFormat:@"\n\n\n\n\n-----------------------\nCистемная информация может помочь нам в отладке приложения.\n-----------------------\n"];
  [temp appendFormat:@"Версия приложения: %@\n", UD_OBJECT(UDKeyVersion)];
  [temp appendFormat:@"Версия iOS: %@\n", [[UIDevice currentDevice] systemVersion]];
  [temp appendFormat:@"Устройство: %@\n", [[UIDevice currentDevice] deviceName]];
  [temp appendFormat:@"Интернет соединение: %@\n", [[RRHelper defaultHelper] networkStatusString]];
  [temp appendFormat:@"Имя пользователя: %@ \n", UD_OBJECT(UDKeyPersonEmail)];
  [temp appendFormat:@"Дата: %@ \n", todayString];
  [temp appendFormat:@"-----------------------\n"];

  MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
  [controller setSubject:subject];
  [controller setToRecipients:@[@"your@email.ru"]];
  [controller setMessageBody:temp isHTML:NO];
  controller.mailComposeDelegate = self;
  [self presentViewController:controller animated:YES completion:nil];
}

#pragma mark - MFMailComposeViewControllerDelegate

- (void) mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
	switch (result) {
		case MFMailComposeResultCancelled:
    {
			break;
    }
		case MFMailComposeResultFailed:
    {
      [RRHelper showErrorMessage:@"Не удалось отправить письмо."];
			break;
    }
		case MFMailComposeResultSent:
			break;
		default:
			break;
	}

  [self dismissModalViewControllerAnimated:YES];
  [self dismissViewControllerAnimated:YES completion:nil];
}

Use this category to get a more precise device name:

//
//  UIDevice+machine.m
//
//  Created by Dennis Kutlubaev on 15.11.13.
//

#import "UIDevice+machine.h"

#import 

@implementation UIDevice(deviceName)

- (NSString*)deviceName {

  struct utsname systemInfo;

  uname(&systemInfo);

  NSString *machineName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

  NSDictionary *commonNamesDictionary =
  @{
    @"i386":     @"iPhone Simulator",
    @"x86_64":   @"iPad Simulator",

    @"iPhone1,1":    @"iPhone",
    @"iPhone1,2":    @"iPhone 3G",
    @"iPhone2,1":    @"iPhone 3GS",
    @"iPhone3,1":    @"iPhone 4",
    @"iPhone3,2":    @"iPhone 4(Rev A)",
    @"iPhone3,3":    @"iPhone 4(CDMA)",
    @"iPhone4,1":    @"iPhone 4S",
    @"iPhone5,1":    @"iPhone 5(GSM)",
    @"iPhone5,2":    @"iPhone 5(GSM+CDMA)",
    @"iPhone5,3":    @"iPhone 5c(GSM)",
    @"iPhone5,4":    @"iPhone 5c(GSM+CDMA)",
    @"iPhone6,1":    @"iPhone 5s(GSM)",
    @"iPhone6,2":    @"iPhone 5s(GSM+CDMA)",

    @"iPad1,1":  @"iPad",
    @"iPad2,1":  @"iPad 2(WiFi)",
    @"iPad2,2":  @"iPad 2(GSM)",
    @"iPad2,3":  @"iPad 2(CDMA)",
    @"iPad2,4":  @"iPad 2(WiFi Rev A)",
    @"iPad2,5":  @"iPad Mini(WiFi)",
    @"iPad2,6":  @"iPad Mini(GSM)",
    @"iPad2,7":  @"iPad Mini(GSM+CDMA)",
    @"iPad3,1":  @"iPad 3(WiFi)",
    @"iPad3,2":  @"iPad 3(GSM+CDMA)",
    @"iPad3,3":  @"iPad 3(GSM)",
    @"iPad3,4":  @"iPad 4(WiFi)",
    @"iPad3,5":  @"iPad 4(GSM)",
    @"iPad3,6":  @"iPad 4(GSM+CDMA)",

    @"iPod1,1":  @"iPod 1st Gen",
    @"iPod2,1":  @"iPod 2nd Gen",
    @"iPod3,1":  @"iPod 3rd Gen",
    @"iPod4,1":  @"iPod 4th Gen",
    @"iPod5,1":  @"iPod 5th Gen",

    };

  NSString *deviceName = commonNamesDictionary[machineName];

  if (deviceName == nil) {
    deviceName = machineName;
  }

  return deviceName;
}

@end

And use this method in your helper class to create a user friendly network status string using Reachability class instance:

- (NSString *)networkStatusString
{
  NetworkStatus networkStatus = [AppDel.reachability currentReachabilityStatus];
  
  /*NotReachable = 0,
  ReachableViaWiFi = 2,
  ReachableViaWWAN = 1*/
  
  switch (networkStatus) {
    case NotReachable:
      _networkStatusString = @"Нет соединения.";
      break;
    case ReachableViaWiFi: {
      _networkStatusString = @"Wi-Fi";
      break;
    }
    case ReachableViaWWAN: {
      _networkStatusString = @"WWAN";
      break;
    }
    default:
      break;
  }
  
  return _networkStatusString;
}

References:
http://stackoverflow.com/questions/8292246/how-to-programmatically-differentiate-between-iphone-4-and-iphone-4s
http://iosdevelopertips.com/device/determine-if-iphone-is-3g-or-3gs-determine-if-ipod-is-first-or-second-generation.html