@property (nonatomic, kopiera, skrivskyddad) NSString * titel, * artist, * genre, * coverUrl, * år; – (Id) initWithTitle: (NSString *) titel artist: (NSString *) artist. NFC Tools is an app which allows you to read, write and program tasks on your NFC tags and other RFID compatible chips. All you need to do is get your device . Re-use/recycle write protected NFC Tags such as hotel key-cards, access badges, price tags, lift cards, key fobs etc You can use this app to associate multiple.
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Add the following signature or method prototype to PersistencyManager. In both cases we should call the new method to center the current view since the current view probably has changed after the user dragged the scroll view.
The “Read” tab allows you to see data skirvskyddad as: Don’t despair, you’ll learn how to do this using the Observer pattern: The decelerate parameter is true if the scroll view hasn’t come to a complete stop yet.
Since HorizontalScroller uses a UIScrollView to scroll the album covers, it needs to know of user events such as when a user stops scrolling. Yes, you still need to actually create the scroller and add it to your main view but before doing that, add the following method:. Finally, add the method for the undo action: Notifications are heavily used by Apple. This line sends a notification through the NSNotificationCenter singleton.
iOS designmönster –
Before you break out of the for loop, center the tapped view in the scroll view. The view’s dimensions inside the scroller will be x with a 10 point margin from its enclosing rectangle.
It’s a perfect example of the Command pattern in action. The selector what message to sendthe target who to send the message to and the arguments of the message. However, before you implement downloadImage: One option is to iterate through Album ‘s properties, save them to a plist file and then recreate the Album instances when they’re needed.
The system executes this method every time the observed property changes. This way you can record large quantities of information on your tag. Also, note that the toolbar isn’t initiated with a frame, as the frame size set in viewDidLoad isn’t final.
skrivskyvdad Now add the following code to reload the scroller: If so, don’t panic, keep calm and feel free to contact us at apps [at] wakdev. This method loads album data via LibraryAPI and then sets the currently displayed view based on the current value of the current view index.
NFC A – Serienummer ex: However, there are a few things to consider first: All the views are positioned starting from the given offset. In KVO, an object can ask to be notified of any changes to a specific skrivdkyddad either its own or that of another object. You don’t skrivskyddwd to mix view logic with communication logic.
Build your project to make sure everything compiles properly. Finally, this piece of code sets the scroll view to center the initial view defined by the delegate. NFC Tools wakdev Verktyg. A UITapGestureRecognizer detects touches on the scroll view and checks if an album cover has been tapped. The publisher never needs to know anything about the subscribers.
It’s simple, yet powerful. In the new code, NSKeyedUnarchiver loads the album data from the file, if it exists. Add the following code to the beginning of viewDidLoad: Since there’s an action in the undo stack, you need to skrivskyddda the undo button. Run your app again.
You’ll add three method to ViewController. I init du fylla arrayen med fem prov album. Scroll to skrivskydvad album as before, stop the app, then relaunch to make sure the problem is fixed: When the view is found, send the delegate the horizontalScroller: Feel free to read up on these to expand your design pattern horizons.
When the download is complete, display the koipera in the image view and use the PersistencyManager to save it locally.
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Build and run your project. You could send out a notification every time an image has been downloaded, but instead, you’ll do that using the other Observer pattern, KVO. Now the HorizontalScroller first view is set to whatever album is indicated by currentAlbumIndex.
The tasks allowing you to automate your phone are under the “Tasks” tab and are categorised. How to Use the Command Pattern Before you get into the invocation of actions, you need to set up the framework for undoing actions.
This provides a great opportunity to talk about the last pattern on the list: The undo button is disabled here because the undo stack starts off empty. Later on, this externalized state can be restored without violating encapsulation; that is, private data remains private.
Additionally, you won’t be able to save the private variables for each class instance since they are not accessible to an external class. They’ll make your life as a sorivskyddad much easier and your code skrivskyddzd lot better!
The last line is important: This is a great way to make sure the app experience remains personal and resumable. That’s exactly why Apple created the Archiving mechanism. However, there’s one odd bit here: