Error in Swift class: Property not initialized at super.init call

Quote from The Swift Programming Language, which answers your question:

“Swift’s compiler performs four helpful safety-checks to make sure that two-phase initialization is completed without error:”

Safety check 1 “A designated initializer must ensure that all of the “properties introduced by its class are initialized before it delegates up to a superclass initializer.”

Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itunes.apple.com/us/book/swift-programming-language/id881256329?mt=11

Related Posts:

  1. How does the @property decorator work in Python?
  2. What does “collect2: error: ld returned 1 exit status” mean?
  3. libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)
  4. Could not load file or assembly or one of its dependencies
  5. error: expected unqualified-id error: Meaning and fix? [duplicate]
  6. Could not load file or assembly or one of its dependencies
  7. c++ compile error: ISO C++ forbids comparison between pointer and integer
  8. Type of expression is ambiguous without more context Swift
  9. error: redefinition of class
  10. What does “Fatal error: Unexpectedly found nil while unwrapping an Optional value” mean?
  11. C++ Error: No match for ‘operator=’
  12. Python3: ImportError: No module named ‘_ctypes’ when using Value from module multiprocessing
  13. Xcode 10.2.1 Command PhaseScriptExecution failed with a nonzero exit code
  14. Java compile error: “reached end of file while parsing }”
  15. What does “collect2: error: ld returned 1 exit status” mean?
  16. Non-static variable cannot be referenced from a static context
  17. Identifier not found error on function call
  18. Non-static variable cannot be referenced from a static context
  19. Strange error nw_protocol_get_quic_image_block_invoke dlopen libquic failed
  20. Non-static variable cannot be referenced from a static context
  21. What is an ‘undeclared identifier’ error and how do I fix it?
  22. Identifier not found error on function call
  23. What is an “internal error” and how do I fix it?
  24. What is an ‘undeclared identifier’ error and how do I fix it?
  25. C ++ error: a expected initializer before [function name]
  26. The located assembly’s manifest definition does not match the assembly reference
  27. invalid new-expression of abstract class type
  28. C programming, error: called object is not a function or function pointer
  29. How do you create a Swift Date object?
  30. what does “error : a nonstatic member reference must be relative to a specific object” mean?
  31. Error: C++ requires a type specifier for all declarations
  32. “Symbol(s) not found for architecture x86_64” on QtCreator project
  33. error: redefinition of class
  34. How can I find a specific element in a List?
  35. C++ error: “Array must be initialized with a brace enclosed initializer”
  36. Swift 4 Attempt to present ViewController whose view is not in the window hierarchy
  37. Extension methods must be defined in a non-generic static class
  38. C compile error: “Variable-sized object may not be initialized”
  39. error: expected primary-expression before ‘)’ token (C)
  40. what’s difference between array and tuple
  41. What’s the purpose of ini_set() in php? (especially for error reporting)
  42. UITableView example for Swift
  43. Extension methods must be defined in a non-generic static class
  44. How to fix “namespace x already contains a definition for x” error? Happened after converting to VS2010
  45. Declaration is only valid at file scope (extension)
  46. How to fix Error: this class is not key value coding-compliant for the key tableView.’
  47. Converting String to Int with Swift
  48. C compile error: Id returned 1 exit status
  49. How do I fix “Undefined variable” error in PHP?
  50. C++ error: definition of implicitly-declared
  51. Command CompileSwift failed with a nonzero exit code in Xcode 10
  52. Compiler error: “initializer element is not a compile-time constant”
  53. cc1plus: error: unrecognized command line option “-std=c++11” with g++
  54. Convert Int to String in Swift
  55. Always get build error : No such module ‘Alamofire’
  56. Cannot open output file, permission denied
  57. Thread-safe List property
  58. What does “error: ‘.class’ expected” mean and how do I fix it
  59. what does Error “Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)” mean?
  60. type any? has no subscript members
  61. Java error: void cannot be converted to String
  62. NameError: name ‘requests’ is not defined
  63. Date Format in Swift
  64. Fatal error compiling: tools.jar not found:
  65. Discord error cannot read property ‘isFocused’
  66. Error “Unterminated conditional directive” in cross-referencing headers
  67. What the meaning of question mark ‘?’ in swift?
  68. What is the syntax for accessing PHP object properties?
  69. Swift 2: !, ? -” Value of optional type “…” not unwrapped”
  70. Stray ‘\342’ in C++ program
  71. Sorting object property by values
  72. Visual Studio compiles but the exe isn’t there
  73. Two-dimensional array in Swift
  74. System not declared in scope?
  75. Error in assignment of member in read-only object
  76. “Are you missing an assembly reference?” compile error – Visual Studio
  77. Call of overloaded function is ambiguous
  78. Could not insert new outlet connection: Could not find any information for the class named
  79. error: ISO C++ forbids in-class initialization of non-const static member
  80. C# conditional operator error Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement
  81. What are the supported Swift String format specifiers?
  82. Error: ‘)’ expected compiler error
  83. Error: No module named ‘fcntl’
  84. How to best set a CSS3 transition to none?
  85. Error: expression cannot be used as a function?
  86. charAt error “char cannot be converted to string”
  87. intellij idea – Error: java: invalid source release 1.9
  88. String index out of bounds exception java
  89. Xcode: Download mp3 file
  90. How to create a global variable?
  91. Unexpected end of file error
  92. virtual memory exhausted: Cannot allocate memory
  93. “public” or “private” attribute in Python ? What is the best way?
  94. Swift Error: Variable used within its own initial value
  95. “Unrecognized selector sent to instance” in swift
  96. Compiler error C4430: missing type specifier – int assumed [duplicate]
  97. Prepare for Segue in Swift
  98. binary operator * cannot be applied to operands of type Int and Double
  99. Swift: print() vs println() vs NSLog()
  100. How to play a sound using Swift?

Leave a Comment

tech