Examples of programming questions in objective-c

What size should TabBar images be?
Border around UITableView Section
Objective C : Getting the height and width of a UIView accurately
Manually call didSelectRowatIndexPath
Class defined without specifying a base class?
UICollectionview Scrolling choppy when loading cells
UITableView begin/end updates
iOS, How to find selected row Of UITableView?
Adding Background Image into View Controller
How Do I Route Audio to Speaker without using AudioSessionSetProperty?
NSCharacterSet - append another character set
Xcode 5: Code signing entitlement errors
How to send Extra parameters in payload via Amazon SNS Push Notification
Setting BOLD font on iOS UILabel
-[__NSArrayM insertObject:atIndex:]: object cannot be nil
UITableView titleForHeaderInSection shows all caps
How to remove navigation bar in ios?
EXC_BAD_access code=2 address 0x8
table header view height is wrong when using auto layout, IB, and font sizes
How to fix "bad receiver type" error
Periodic iOS background location updates
How can I check if an object in an NSArray is NSNull?
switch case on NSString in objective c
Send POST request using NSURLSession
Removing item from array by property value
Why does UIViewController extend under UINavigationBar, while UITableViewController doesn't?
XCTAssertEqual error: ("3") is not equal to ("3")
Ordered Core Data Relationship - How it is managed or what is the default ordering?
How to resize UITableViewCell to fit its content?
UIButton with hold down action and release action
Detecting taps on attributed text in a UITextView in iOS
Why can't LLDB evaluate this expression?
How to animate application icon in iOS?
UITextPosition to Int
AVPlayer : How to handle network interruptions
How do I "hide" a UIRefreshControl?
AutoLayout with hidden UIViews?
NSOperation and NSOperationQueue working thread vs main thread
didUpdateLocations not called
How to add a toolbar to the bottom of a UITableViewController in Storyboards?
How to save NSMutablearray in NSUserDefaults
How to handle multiple markers on Google Maps with same location?
__unused Flag Behavior/Usage (GCC with Objective-C)
NSAttributedString - get font attributes
What does id<...> mean in Objective-C?
How can I get the iOS device CPU architecture in runtime
NSWindow with round corners and shadow
How to get values from a dictionary in iOS
Detect moment when newline starts in UITextView
NSArray find object or objects - best practices
URL for managing subscription in iOS
Add CALayer below UIView
CALayer inner border corner radius
#define: why uppercase?
How to change the highlighted color of a UIButton?
String format for CFBundleDevelopmentRegion (info.plist) for App Store display
UIButton default tap fade animation missing in UITableViewController custom cell
How do I get the currently focused element when using VoiceOver on iOS?
Setting accessibility identifier programmatically on UIBarButtonItem
Static NSArray of strings - how/where to initialize in a View Controller
Getting interactivePopGestureRecognizer dismiss callback/event
URL scheme for opening native calendar with specific date
when VoiceOver is on, is there a way an app can detect a single-finger (left-right)swipe?
didReceiveRemoteNotification:fetchCompletionHandler not being called when app is in background and not connected to Xcode
Adding UIButton to UITableView section header
What does "macro" mean in Objective-C?
TableView Showing Behind Tab Bar
How can I programmatically present a view controller modally?
How iOS UITableView under NavigationBar?
Moving Accessibility Voiceover cursor focus to a specific element
Prevent "Execution was interrupted, reason: internal ObjC exception breakpoint(-3)" on lldb
What does @() mean in Objective-C?
Atomic properties vs thread-safe in Objective-C
UIScrollView contentInset not working
Convert selectedTextRange UITextRange to NSRange
Preserve folder structure Cocoa Pods
Activity indicator with custom image
NSAttributedString ignores Autoshrink and numberOfLines for UILabel (iOS 6)
How to convert NSDictionary to custom object
How to set default localization for iOS app
Draw a line with a CALayer
How to create a line width of 0.5 pixels
Convert NSNumber to NSDecimalNumber
How to get back "Allow Push Notifications" dialog after it was dismissed once?
Unable to dequeue a cell with identifier
Comparing in objective C - Implicit conversion of 'int' to 'id' is disallowed with ARC
Drawing a line between two points using SceneKit
AVCaptureMovieFileOutput - no active/enabled connections
How to check Resolution, bitrate of video in iOS
Where to create and how to use Enum in iOS?
iOS 7 - Difference between viewDidLoad and viewDidAppear
Only allow letters and numbers for a UITextField
Inequality Constraint Ambiguity
How can I change UITextField leftview frame
Round top corners of a UIView and add border
static NSDictionary* const letterValues = @{ ..... } in a method does not compile
Convert file path to file url[NSUrl]
NSUInteger should not be used in format strings?
How to properly position the back button in iOS7
Bring UIButton to front layer
How to get UIImage of AppIcon?
Make UITextView multiline
UICollectionView cellForItemAtIndexPath is nil
How to bring application to foreground in ios?
'release' is unavailable: not available in automatic reference counting mode
What is the difference between 'thread' and 'queue' in iOS development?
How to add a subview that has its own UIViewController in Objective-C?
Call a method from AppDelegate - Objective-C
Error: ld: library not found for -lPods with CocoaPods
Objective-C crash on __destroy_helper_block_
query sqlite error out of memory xcode
Force UICollectionView to stop scrolling
UICollectionView reloadData But View Blinks
Shadow UIview and clipsToBounds
How to open Settings programmatically like in Facebook app?
AVPlayer Item get a nan duration
Split string by particular character ,iOS
Strong and weak references in Swift
Swift Assertions behaviour in production applications
Objective-C asking for alloc on swift class
dyld: Symbol not found: _NSURLAuthenticationMethodClientCertificate when trying to run iOS app
How to use UIVisualEffectView to Blur Image?
CGPointMake in Swift
Could not instantiate class named IBNSLayoutConstraint
swift : Enum constant with type and value
self.tableView.reloadData() not working in Swift
Proper usage of intrinsicContentSize and sizeThatFits: on UIView Subclass with autolayout
Framework header file not found (iOS pop framework)
Best architectural approaches for building iOS networking applications (REST clients)
Can a Swift Optional Int (Int?) be exposed to Objective-C via bridging?
ORDER BY random() with seed in SQLITE
iOS: Is there a way to check if an NSArray object contains a certain character?
Accessing temp directory in Swift
UICollectionViewFlowLayout minimumInteritemSpacing doesn't work
UICollectionView with Paging Enable
EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose
NSSecureCoding trouble with collections of custom class
Hide device Volume HUD view while adjusitng volume with MPVolumeView slider
How to get a certain subview from UIView by tag
?: in Objective-C
Animate nav bar title text change
Using Swift class in Objective c. Undeclared identifier error ocurs
UITableView set background color
Referencing image in a folder in asset catalog
Only ONE VIEW landscape mode
Center a UIView vertically and horizontally within its parent view
Podfile error while doing "pod install"?
How to Remove a Previous ViewController
makeKeyWindow vs makeKeyAndVisible
Swift protocol in Objective-C class
Sharing text as a string to another app
How to detect when a UIWebView has completely finished loading?
How to fade out a NSView with animation?
Using sysctlbyname() from Swift
Remove the page indicator from UIPageViewController
How to cast an object to class in Objective-C
App crashes in Release build but not in debug
NSPredicate with Multiple Conditions
UIActivityViewController crashing on iOS 8 iPads
How to set & get value of pointer Swift
Swift readonly external, readwrite internal property
How to add a private CocoaPod as a dependency in another pod .podspec file?
iOS 8 UITableView separator inset 0 not working
com.apple.developer.associated-domains issue when validating iOS app
What is the typeof() equivalent in Objective-C?
Using PinchGesture; how can I zoom in to where a user's fingers actually "pinch"?
Error "_OBJC_CLASS_$_AppDelegate", referenced from:" and error: linker command failed with exit code 1 (use -v to see invocation)
How can I detect whether a user has an iPhone 6 Plus in standard or zoomed mode?
Draw circle with UIBezierPath
Xcode 6 - Unknown type name 'NSString' / Expected identifier or '('
Are cookies in UIWebView accepted?
UIViewController extension to instantiate from storyboard
Is there a way to ask user for Camera access after they have already denied it on iOS?
Instantiate View Controller from Storyboard vs. Creating New Instance
Specifying one Dimension of Cells in UICollectionView using Auto Layout
What are best practices for validating email addresses in Swift?
Is it possible to programmatically get the identifier of a basic UIViewController from an UIViewController or Storyboard in Swift/Objective-C?
AVPlayer was deallocated while key value observers were still registered with it
Objective C to Swift header file with multiple targets
Cannot find interface declaration for 'UIView'
How to hide Navigation Bar without losing slide-back ability
Change NSString to int value?
Cannot access property on Swift type from Objective-C
Swift globals and global functions in objective c
How to achieve paint brush strokes in iOS
Programmatically check whether an app is installed
Unzip files in swift
How to call an Objective C class method in Swift
How to change UITableViewRowAction title color?
In autolayout, how can I have view take up half of the screen, regardless of orientation?
Calling NSStringFromClass on a Swift Class in Objective-C returns module mangled name
UICollectionView: Is there a way to reload only the supplementary views?
Set text in uicollectionviewcell
Load UIViewController from the separate nib file in swift?
Other Linker Flags missing in Xcode Build Settings
cannot find interface declaration for 'NSObject', superclass of 'GPXType'
Unable to drag and move around files in Project Navigator in Xcode
Is there a UITextField keyboard type that like a number pad but allows negative numbers?
How do you dynamically format a number to have commas in a UITextField entry?
How to check if navigation controller is pushed or is a root view controller?
How to disable UIButton Tint Color?
add UIViewController in subview
Black screen after presenting modal view controller in current context from UITabBarController
Difference between RSS and Web API?
How to add playable(such as wav,wmv) header with PCM data/buffer in iOS?
How to convert AVAsset to NSData or save it to file manager
objective-c - Swift classes are not visible in Objective-C .h file
iOS background fetch custom interval
Strange UIView-Encapsulated-Layout-Height Error
unrecognized selector sent to instance with Coredata Swift
No Setter method for assignment to property - cocoa application
In Swift, how would you write the scrollViewWillEndDragging withVelocity targetContentOffset method?
dyld: Library not loaded for a Framework within a Framework
@IBInspectable with enum?
How to add a border inside a uiview?
How do you clear attributes from NSMutableAttributedString?
How to make thread sleep for seconds in iOS?
What the equivalent of activity life cycle in iOS?
iOS: How can Objective C code read static variables in Swift?
Xcode attach to process doesn't display NSLog
NSURLSession error handling
How do I create a UI TableView with multiple columns in Xcode?
command/usr/bin/codesign failed with exit code 1- code sign error
why string, array and dictionary in Swift changed to value type
Less Blur with `Visual Effect View with Blur`?
XCode 6.3 Warning : Comparison of address of 'myObject' not equal to null pointer is always true
Get total step count for every date in HealthKit
XCTest: The bundle “target Tests” couldn’t be loaded because its executable couldn’t be located
Setting UITextField not editable or editable
pre select/highlight UICollectionViewCell on first load of view
Implicit declaration of function 'pthread_mutex_init' is invalid in C99
What's the difference between arc4random and arc4random_uniform?
Rotating a node in SceneKit
How do I get current application locale?
Disable assertions while testing
How to add a button with border to storyboard in Xcode 6
How to add custom project configurations to Xcode when using CocoaPods?
How to get detailed language of device in swift
How to get the name of HKWorkoutActivityType in HealthKit?
Get frame height without navigation bar height and tab bar height in deeper view hierarchy
Error 'Invalid update: invalid number of rows in section 0' attempting to delete row in table
Adding view controller as launch screen
How to change or update NSLayoutConstraint programmatically
objc_msgSend [__NSArrayM dealloc] crash report sometimes from Crashlytics
Swift – Instantiating a navigation controller without storyboards in App Delegate
Optional can only be applied to members of an @objc protocol
addObject to NSArray in Objective-C
Xcode 7, Obj-C, "Null passed to a callee that requires a non-null argument
importing swift framework into a objective-c project
setStatusBarHidden is deprecated in iOS 9.0