We can get day, month and year components of NSDate in integer form. For example, if the date is 1/2/2014 then we should get 1, 2 and 2014 separately as an integer. We can achieve......
How to get UTC Date and Time Using Objective-C? | iOS Interview Question | iOS Programmer Guide
We can get UTC date & time with the help of the below objective c user defined function. -(NSString *)getUTCFormateDate:(NSDate *)localDate { NSDateFormatter *dateFormatter......
Explain Relationship of the Frame, Bounds, and Center Properties in UIView | iOS Interview Question | iOS Programmer Guide
A view object tracks its size and location using its frame, bounds, and center properties: The frame property contains the frame rectangle,......
Explain UIView Drawing Cycle in iOS App? | iOS Interview Question | iOS Programmer Guide
The UIView class uses an on-demand drawing model for presenting content. When a view first appears on the screen, the system asks it to draw its content. The system captures......
Explain About iOS Notification? | iOS Interview Question | iOS Programmer Guide
A notification is a message sent to one or more observing objects to inform them of an event in a program. The notification mechanism of Cocoa follows a broadcast model. It is a......
Identifying iOS Application’s Documents Directory | iOS Interview Question | iOS Programmer Guide
We can easily identify the documents directory of an iOS Application with the help of 'NSSearchPathForDirectoriesInDomains' as given in the following objective-C code snippet //......
Purpose of PCH file in Xcode? | iOS Interview Question | iOS Programmer Guide
.pch file is a prefix header file which is automatically created by xcode. It is compiled and stored in cache, and automatically included in every source file during the compilation......
String Split Equivalent in iOS xcode | iOS Interview Question | iOS Programmer Guide
The C# equivalent of String split in iOS is possible. The easiest way to split a NSString into an NSArray is the following: NSString *string = @"hello,world"; NSArray *stringArray......
Explain the Purpose of main Function in Xcode Project? | iOS Interview Question | iOS Programmer Guide
Like any C-based app, the main entry point for an iOS app at launch time is the main function. In an iOS app, the main function is used only minimally. Its main......
Determining iOS Apps Default Settings If Changed | iOS Programmer Guide
If you have created a custom settings using the standard root.plist for the iphone App. There is a way to determine when the user changes those settings by listening to NSUSerDefaultsDidChange-notifications. [[NSNotificationCenter......
Explain Various iOS App State Changes? | iOS Interview Question | iOS Programmer Guide
State Description Not runningThe app has not been launched or was running but was terminated by the system. InactiveThe app is running in the foreground but is currently not......
Explain iOS App Launch Cycle? | iOS Interview Question | iOS Programmer Guide
When your app is launched, it moves from the not running state to the active or background state, transitioning briefly through the inactive state. As part of the launch cycle,......
What are the Types of Segues In Xcode? | iOS Interview Question | iOS Programmer Guide
Push. A push segue adds the destination view controller to the navigation stack. Push segues may only be used when the source view controller is connected to a navigation......
Explain Navigation Controllers In Xcode? | iOS Interview Question | iOS Programmer Guide
If your app has more than one content view hierarchy, you need to be able to transition between them. For this, you’ll use a specialized type of view controller: a navigation controller......
Explain Controls In Xcode? | iOS Interview Question | iOS Programmer Guide
A control is a user interface object such as a button, slider, or switch that users manipulate to interact with content, provide input, navigate within an app, and perform......
Explain Outlets In Xcode? | iOS Interview Question | iOS Programmer Guide
Outlets provide a way to reference objects from your interface—the objects you added to your storyboard—from source code files. You create an outlet by Control-dragging from......
Explain Actions In Xcode? | iOS Interview Question | iOS Programmer Guide
An action is a piece of code that’s linked to some kind of event that can occur in your app. When that event takes place, the code gets executed. You can define an action......
Purpose of View Controllers in Xcode | iOS Interview Question | iOS Programmer Guide
After you’ve built a basic view hierarchy, your next step is to control the visual elements and respond to user input. In an iOS app, you use a view controller (UIViewController)......
Functionality of @autoreleasepool | iOS Interview Question | iOS Programmer Guide
The @autoreleasepool statement is there to support memory management for your app. Automatic Reference Counting (ARC) makes memory management straightforward by getting the compiler......
Responsibility of UIApplicationMain in iOS XCode? | iOS Interview Question | iOS Programming Guide
UIApplicationMain function, will be automatically called in main.m source file. The UIApplicationMain function creates an application object that sets up the infrastructure for your......
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