Suppose there is button on first screen of an app which is connecting to second screen(i.e on click on that button second screen will come) and also to a function on first screen class .
Now my question is what is the flow first function||second screen will executes?or both simultaneously will execute.
You have to know that iOS Applications usually use MVC pattern.
So for your example, you have the View (V), containing the design, your button etc..
And the Controller (C), implementing the logic.
The answer is : You can decide which one comes first, just depends how you implement it.
But I don't really understand the logic in your example, can you be more specific.
You should try to make 1 interface element for 1 purpose.
Related
I want to build some analytics into my app and I would like to send some data when user leaves current screen, though there are multiple ways he can do so (back button, other button, sidebar menu, etc). Is there any efficient way to do this? I really don't feel like implementing it to every possible button that can lead the user to different screen.
You should call your function inside viewWillDisappear, which is called every time the current view controller is about to disappear from screen. See the documentation of viewWillDisappear
Also see the view controller life cycle (thanks #Paolo for the tip) below (documentation).
So I have a basic game I'm developing for iOS.
There's a 2 player mode and it involves hitting buttons. Once the button is hit (or pressed) something happens in the game.
So, each player has half of the screen, with their own buttons inside of their half, that act independently.
Do I need to worry about if player 1 hits a button on the lower part of the screen at the exact moment player 2 hit's a button on the top part of the screen?
If I do, do I need to handle it like the answer in THIS QUESTION.
I figure the chances are extremely slim, but never-the-less should be handled.
You don't need to worry about them being tapped at the same time. Since your buttons are independent each one should have it's own action method that is called when tapped, and it's okay if those methods are called at the same time since they do their own thing.
The reason the question you linked to is different is that they wanted to do special logic IF both buttons were tapped. Since you don't care whether they were tapped at the same time, you don't need to implement that code.
In many apple watch apps during Apple's "Spring Forward" when the apps pushed to another interface controller, they looked like this:
Then the interface controller would load
I am perfectly aware that this screen appears when the app starts up, but I want to show the stock loading screen after I push an interface controller
**I do not want to use image sequencing to achieve this
Also apple has sample code you can download called "Lister" that shows the loading symbol after every interface controller push, without image sequencing
How can you achieve this??
TL;DR
Either use the system behavior in the "Hides When Loading" checkbox under the Attributes of the Interface Controller and let the system manage it like in the example code or...
Create your own interface controller that will have to use a image sequence.
Longer Explanation
Your confusing what's actually possible. The stock loading screen isn't something that you can actually call nor manipulate. It's the default loading animation for a controller that hasn't finished awakeWithContext:. That's why you see it in the example code.
You can actually control it in the storyboard. Select or deselect the "Hides When Loading" checkbox under the Interface Controller section of the Attributes of the Interface Controller.
However, if you want control over when/where, you will have to create your own and yes that does mean you have to use an image sequence. There really isn't another way to do that animation currently without an image sequence.
In my iOS application, when the user pushes a button in a view, a NSTimer is trigered in the controller.
On the third tick, I would like to make the background of the view bliking.
I've written the blinking function in the view (it should't be written in the controller, should it ?)
I can trigger this blinking function in the controller by
LostView *lostView = (LostView* ) self.view;
[lostView blinkBackground];
But it's bad, isn't it ? The controller shoudn't know the view neither the name of the function ?
I would like to apply the MVC pattern
Is the observer/obervable pattern applicable in this situation ?
Thanks
No it's not bad at all. It looks like you implemented the method to make the view blink in the view itself. That's fine, because it's directly related to the visual representation (i.e. the view part of MVC). You could reuse that view in any other app that requires a blinking view.
Since that blinking is triggered by an NSTimer I assume that it's somehow dependent on the logic in this specific app. The view can't (shouldn't) know when it's supposed to blink (that would only be the case if that blinking was a direct reaction of an interaction with it or another related part of the UI - or it was part of a more complex element, for example a countdown timer that always starts to blink when it reaches the last 10 secs or so. For example the UIButton provides the possibility to highlight it self if it's touched.)
But if that blinking is a reaction of some state transition in your app, maybe some new data becomes available or a countdown is about to expire, the controller is a perfectly reasonable place to trigger that.
i'm working on my first app and the problem a have is that the application interface design is quite customised, (even though it is a tab bar based app). now in one of the view controllers i need to present the user with the print interaction controller to print images. the thing is i don't use a navigation bar or a toolbar system or otherwise. i have managed to attach a target action method to a custom button. however, apple states that the printing interface should be presented by a system button (the one that looks like an arrow, kind of). question is: is there any way of putting a system icon inside a button that is not inside a (bar)?, or would it be ok to somehow tell the user (with an overlay or something) that tapping the button i'm using (the button is a red ribbon coming down from a picture frame) they will get the printing options?
Apple says:
Although the print button can be any
custom button, it is recommended that
you use the system item-action button
shown in Figure 6-1.
I'd interpret that to mean that you can use your own button if you want to.
You might want to consider having a toolbar at the top of the view for this particular tab. Just appearing on this tab. This would make the issue moot.
You could also, have the tool bar "slide in" and "slide out" from the top to provide access to this (and other?) actions. A single or double tap could instigate such an action.
Unfortunately, Apple doesn't expose the images for the custom bar button items in any reasonable manner. If you'd like access to them, I suggest using the bug reporter system at Apple's developer site to request that.