Swift iOS Dependency Injection Tutorial

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In this tutorial we will break down the dependency injection design pattern. We will learn what dependency injection is, the benefits gained from applying dependency injection, and go over a few examples of bad code and how we can improve that code using dependency injection.

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[CodePro]

Moving on into design pattern tutorials the first topic I'd like to break down is dependency injection. Dependency injection is a big fancy word for a very simple concept. Dependency injection can greatly improve the quality and safety of your code and is very simple to apply and start using. See if you can apply this concept in your code and projects.

[RajrkSunny]

This is the 6th or 7th Video I'm watching and this by far the best explanation....

[vladimirsukanica]

At last... someone that doesn't complicate a simple thing to explain... good job!

[dimitardimitrov]

This tutorial deserves to take a LIKE because it's one of the less well-explained what DI is.

[amaancan]

Best DI explanation I came across. You really put yourself in the mindset of a beginner which others often don’t do. Thanks for explaining every little aspect :)

[richadua]

Great video..I see that you are using quicktime player to create the video. How have you integrated voice over on that? Is that through post-editing?

[kevinvishal]

Thanks a ton Code Pro... This was neat... Could you please teach us Protocol Oriented Programming in action ? I would love to learn and use it. Thank you.

[ushadesai]

Constructor Initializing the classes is called Dependency injection. Is that it?

[RyuuzakiJulio]

I see. I had been doing this forever. Was wondering why it wasn’t declared like this since the beginning but I understand that’s the name of this coding pattern. Thank you for the video.

[rikirokhman]

I'm learning about Unit Testing for network, and this tutorial helped me a lot... Thank you so much

[JacksonSmith]

Hello from Brazil 🇧🇷
Thank you for this excellent class.

[TokyoXtreme]

Very nice explanation along with clear, real-world examples on implementation.

[hackj]

Property Injection is also a type of Dependency Injection.

[petersuvara]

Basically, just use a constructor/initializer...

[letri]

why not use Interface class in depency injection, I mean do like this (if you have some better solutions, please share me. I also want to learn something new from each other):

***interface I do like this:
@interface MainMenuController ()

@property (nonatomic) id<IICloudManager> icloudManager;
@property (nonatomic) id<IGlobalSettingManager> globalSettingManager;
@property (nonatomic) id<ILocalValueManager> localValueManager;
@property (nonatomic) id<IIAPHelper> iIAPHelper;

@end


*** I construct like this:

-(void)Di:


localValueManager
{

_localValueManager = localValueManager;
_icloudManager = cloudManager;
_icloudManager.delegate = self;

_globalSettingManager = globalSettingManager;

_iIAPHelper = iIAPHelper;
}

*** I inject like this:


id<ILocalValueManager> localValueManager = [[LocalValueManager alloc] init];
id<IGlobalSettingManager> globalSettingManager = [[GlobalSettingManager alloc] init];
id<IICloudManager> icloudManager = [[ICloudSourceManager alloc] init];

NSSet * productSet = [NSSet setWithObjects:kInAppPurchase_litle, nil];

id<IIAPHelper> iIAPHelper = [[IAPHelper alloc]

[self Di:icloudManager


iIAPHelper:iIAPHelper];

***This is a protocol class I use to define Interface class:

@protocol ICloudManagerDelegate <NSObject>

-(void)startUpdateICloudData;
-(void)endUpdateICloudData;

@end

@protocol IICloudManager <NSObject>

@property (nonatomic, weak) id<ICloudManagerDelegate> delegate;

-(BOOL)isConnectToICloud;

-(NSDictionary *)getInventoryCommonObjArr;
- (NSArray *)getShohinCommonObjArr;
- (NSArray *)getSokoCommonObjArr;
- (NSArray *)getTantoCommonObjArr;
- (NSArray *)getTokuCommonObjArr;
-(CommonObj *)textTofind;

-(NSDate *)name;
-(NSArray *)getAllFileName;
-(void)setFileName:(NSString *)fileName forKey:(NSString *)key;
-(BOOL)isFileMatch:(NSString *)fileName mode:(MainVcMode)mode;

@end


***And I do like this:

@interface ICloudSourceManager : NSObject <IICloudManager>



@end