This line
secondNumber = Screen.text!.toInt()!
means: Get the Screen object, get the text property and please crash if it doesn’t exist, then get the text converted to an integer, and please crash if it doesn’t exist.
That’s what the !
means: “I am sure this thing exists, so please crash if it doesn’t”. And crash is what it did.
Related Posts:
- libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)
- libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)
- Xcode 10.2.1 Command PhaseScriptExecution failed with a nonzero exit code
- How do you create a Swift Date object?
- Swift 4 Attempt to present ViewController whose view is not in the window hierarchy
- UITableView example for Swift
- Converting String to Int with Swift
- Where is the variable “code” in SKError defined?
- Command CompileSwift failed with a nonzero exit code in Xcode 10
- Always get build error : No such module ‘Alamofire’
- Date Format in Swift
- What the meaning of question mark ‘?’ in swift?
- Could not insert new outlet connection: Could not find any information for the class named
- Swift Error: Variable used within its own initial value
- Prepare for Segue in Swift
- How to play a sound using Swift?
- App iOS stuck on blank white screen when build release React Native
- iOS Simulator – Can’t log in with iCloud
- Load Animated gif in UIImageView IOS
- iOS: Random black screen when loading the app
- Drawing Hexagon grid in Cocos 2d-x
- iPhone system font
- What does “Fatal error: Unexpectedly found nil while unwrapping an Optional value” mean?
- How to write C++ on Mac?
- Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3
- Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3
- A server with the specified hostname could not be found
- Where is redeem code for public link for TestFlight?
- Xcode 10, Command CodeSign failed with a nonzero exit code
- Xcode – How to fix ‘NSUnknownKeyException’, reason: … this class is not key value coding-compliant for the key X” error?
- What are the difference between macOS and iOS?
- Xcode couldn’t find any provisioning profiles matching
- Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy
- symbol(s) not found for architecture x86_64 in xcode 10
- Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy
- CFNetwork SSLHandshake failed (-9824) NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9824)
- Is there a private messaging UI (inbox, sent, compose) framework for iOS?
- ‘strcmp’ was not declared in this scope
- malloc: *** error: incorrect checksum for freed object – object was probably modified after being freed
- NSURLErrorDomain error codes description
- Duplicate symbols for architecture x86_64 under Xcode
- MVC5 / C# – Cannot perform runtime binding on a null reference
- Print: Entry, “:CFBundleIdentifier”, Does Not Exist
- Loaded nib but the ‘view’ outlet was not set
- Xcode 9 – “Fixed Width Constraints May Cause Clipping” and Other Localization Warnings
- iPhone 6 and 6 Plus Media Queries
- Got a EXC_CORPSE_NOTIFY symbol crash, how to track it?
- “Could not find any information for class named ViewController”
- warning: ‘characters’ is deprecated: Please use String or Substring directly
- com.apple.WebKit.WebContent drops 113 error: Could not find specified service
- What is the meaning of ‘No bundle URL present’ in react-native?
- Convert .cer to .p12
- Add a simple UIView as header of UICollectionView
- UIButton title text color
- Xcode: Could not locate device support files
- Remove alpha channel in an image
- Pod install is staying on “Setting up CocoaPods Master repo”
- Download Xcode simulator directly
- Alert”Developer tools access needs to take control of another process for debugging to continue.Type your password to allow this.”
- Could not load NIB in bundle
- Xcode error “Could not find Developer Disk Image”
- IOS home screen icons: where put and what size?
- What is the proper way to handle a NumberFormatException when it is expected?
- Differences between arm64 and aarch64
- Stack smashing detected
- What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
- JavaFX – Exception in Application start method?
- Proper way to declare custom exceptions in modern Python?
- Input string was not in a correct format
- Strange error nw_protocol_get_quic_image_block_invoke dlopen libquic failed
- Given final block not properly padded
- Python Error io.UnsupportedOperation: not readable
- “NoClassDefFoundError: Could not initialize class” error
- react-native: command not found
- Exception in thread “main” java.lang.UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)
- Why do I get an UnsupportedOperationException when trying to remove an element from a List?
- How to use iMonkey in an iOS app
- UIStackView before iOS 9.0
- How to fix Error: this class is not key value coding-compliant for the key tableView.’
- What causes java.lang.IncompatibleClassChangeError?
- How do I fix “Undefined variable” error in PHP?
- Implementation of Vector in C++
- classic ASP error ‘80020009’ Exception occurred
- Java can’t find file when running through Eclipse
- Exception from HRESULT: 0x800A03EC Error
- Developing Unity game on Windows for iOS devices
- Substring index and length must refer to a location within the string
- How to catch all exceptions in c# using try and catch?
- What exactly is the scope of Access Violation ‘0xc0000005’?
- Getting android.content.res.Resources$NotFoundException: exception even when the resource is present in android
- Catch multiple exceptions at once?
- Swift – How to convert String to Double
- Official reasons for “Software caused connection abort: socket write error”
- How can I read a text file in Android?
- Strange Exception in Tkinter callback
- Xcode: Download mp3 file
- How can I catch all the exceptions that will be thrown through reading and writing a file?
- Swift: print() vs println() vs NSLog()
- No Main class found in NetBeans
- wp.getUsers XML-RPC method is returning only 50 users, how can i get all the users