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- (void)setProgramaticConstraints {
    self.myView = [UIView new];
    self.myView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.myView setBackgroundColor:COLOR_WHITE_SMOKE];
    [self.view addSubview:self.myView];

    [self.myView addConstraint:[NSLayoutConstraint constraintWithItem:self.myView
                                                                      attribute:NSLayoutAttributeHeight
                                                                      relatedBy:NSLayoutRelationEqual
                                                                         toItem:nil

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#define IS_OS_8_OR_LATER    ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_IPHONE_4 (IS_IPHONE && ([[UIScreen mainScreen] bounds].size.height == 480.0) && ((IS_OS_8_OR_LATER && [UIScreen mainScreen].nativeScale == [UIScreen mainScreen].scale) || !IS_OS_8_OR_LATER))
#define IS_IPHONE_5 (IS_IPHONE && ([[UIScreen mainScreen] bounds].size.height == 568.0) && ((IS_OS_8_OR_LATER && [UIScreen mainScreen].nativeScale == [UIScreen mainScreen].scale) || !IS_OS_8_OR_LATER))
#define IS_STANDARD_IPHONE_6 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 667.0  && IS_OS_8_OR_LATER && [UIScreen mainScreen].nativeScale == [UIScreen mainScreen].scale)
#define IS_ZOOMED_IPHONE_6 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 568.0 && IS_OS_8_OR_LATER && [UIScreen mainScreen].nativeScale > [UIScreen mainScreen].scale)
#define IS_STANDA

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#import <UIKit/UIKit.h>

IB_DESIGNABLE //Reusable Views loaded from a xib file, you can see them on storyboard

@interface ReusableView : UIView

@property (weak, nonatomic) IBOutlet UILabel *message;

@end

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#import <Foundation/Foundation.h>

@interface NetworkManager : NSObject

+(NetworkManager*) sharedInstance;
-(void)callAPIWithParameters:(NSDictionary *)parameters andUrl:(NSString *)url andMethodType:(NSString *)methodType andCompletion:(void(^) (BOOL success, id response, NSString *message, NSError *error)) completion;

@end

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#import <UIKit/UIKit.h>

static NSString * const reusableCellIdentifier = @"reusableCell";

@interface ReusableTableCell : UITableViewCell

@property (weak, nonatomic) IBOutlet UIImageView *reusableImageView;
@property (weak, nonatomic) IBOutlet UILabel *reusableLabel;

@end

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import Foundation
import Alamofire

class AccessTokenAdapter: RequestAdapter {
    private let accessToken: String
    
    init(accessToken: String) {
        self.accessToken = accessToken
    }
    

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#pragma mark - User Defaults

//Saves information on cache
+ (void)saveToUserDefault:(NSObject*)objectToSave withKey:(NSString*)key {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setObject:objectToSave forKey:key];
    [userDefaults synchronize];
}

//Retrieves information from cache

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DELEGATE METHODS CALLED WHEN OPENING APP  

Opening app when system killed or user killed  
    didFinishLaunchingWithOptions  
    applicationDidBecomeActive    

Opening app when backgrounded  
    applicationWillEnterForeground  
    applicationDidBecomeActive  

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let nonMutableProperty = "this content cannot change"
var mutableProperty = "this content can be changed"
mutableProperty = "changing variable content"

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var optionalString: String? = nil

if let unwrappedOptionalWithIf = optionalString {
    print("Use \(unwrappedOptionalWithIf) here")
}

func printString(string: String?) {
    guard let unwrappedOptionalWithGuard = optionalString else {
        print("Treat error")
        return