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// add child view
UIViewController* controller = [self.storyboard instantiateViewControllerWithIdentifier:@"test"];
[self addChildViewController:controller];
controller.view.frame = CGRectMake(0, 44, 320, 320);
[self.view addSubview:controller.view];
[controller didMoveToParentViewController:self];

// remove child view
UIViewController *vc = [self.childViewControllers lastObject];
[vc willMoveToParentViewController:nil];

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#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)

#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)
#define SCREEN_MAX_LENGTH (MAX(SCREEN_WIDTH, SCREEN_HEIGHT))
#define SCREEN_MIN_LENGTH (MIN(SCREEN_WIDTH, SCREEN_HEIGHT))

#define IS_IPHONE_4_OR_LESS (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)

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// Encode a string to embed in an URL.
+(NSString *)encodeString:(NSString *)string {
    return CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(nil, (CFStringRef)string, nil, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8));
}
 
// Decode a percent escape encoded string.
+(NSString *)decodeString:(NSString *)string {
    return CFBridgingRelease(CFURLCreateStringByReplacingPercentEscapesUsingEncoding(nil, (CFStringRef)string, CFSTR(""), kCFStringEncodingUTF8));
}

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Include

# Pico+
DialerFramework        # Install Dialer Framework
CalSync                # Install Google Calendar Sync (except if Google Calendar is being installed)
GoogleTTS              # Install Google Text-to-Speech (Micro+ on 5.0-, Pico+ on 6.0+)
PackageInstallerGoogle # Install Google Package Installer

# Nano+
BatteryUsage           # Install Device Health Services (7.1+)