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Thanks, I will read this over.
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I have n exception in this code (which I did not write):<br />
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this class is not key value coding-compliant for the key 'questionGuid'.<br />
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I suspect the object i the wrong type, but need to understand the code a bit.<br />
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Can someone explain it to me?<br />
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&nbsp;NSPredicate* predicate = [NSPredicate predicateWithFormat:@&quot;ques<wbr />tionGuid LIKE[c] %@ &quot;, [_result question].guid];<br />
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QuestionAsked* questionAsked = [[_quizEngine.theme.questi<wbr />onAskedArr<wbr /> filteredArrayUsingPredicat<wbr />e:predicat<wbr />e] objectAtIndex:0];<br />
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[questionAsked updateResultArray:[submitT<wbr />apDate timeIntervalSince1970] isCorrect:_result.isAnswer<wbr />Correct];
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I have n exception in this code (which I did not write):

this class is not key value coding-compliant for the key 'questionGuid'.

I suspect the object i the wrong type, but need to understand the code a bit.

Can someone explain it to me?



 NSPredicate* predicate = [NSPredicate predicateWithFormat:@"questionGuid LIKE[c] %@ ", [_result question].guid];

QuestionAsked* questionAsked = [[_quizEngine.theme.questionAskedArr filteredArrayUsingPredicate:predicate] objectAtIndex:0];

[questionAsked updateResultArray:[submitTapDate timeIntervalSince1970] isCorrect:_result.isAnswerCorrect];

ObjC: Please explain Predicate

Swift is a compiled programming language created for iOS, OS X, watchOS, tvOS and Linux development by Apple Inc. Swift is designed to work with Apple's Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C code written for Apple products. Swift is intended to be more resilient to erroneous code ("safer") than Objective-C and also more concise. It is built with the LLVM compiler framework included in Xcode 6 and later and uses the Objective-C runtime, which allows C, Objective-C, C++ and Swift code to run within a single program. A second free implementation of Swift targets Microsoft's Common Language Infrastructure (a.k.a. .NET) and the Java/Android platform.

Swift Programming

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.

iOS is a mobile operating system developed by Apple; it is a derivative of the Mac OS X desktop operating system, with which it shares many (but not all) common frameworks and other components. These include Cocoa Touch, the Mach/Darwin/XNU kernel and code from the Berkeley Software Distribution (BSD). Each iOS application runs in its own secure sandbox to prevent altering other applications, the operating system, or any other data.

Objective-C is an object-oriented programming language that is a strict superset of C (any valid C code is equally valid Objective-C code), and it inherits its object-oriented capabilities from Smalltalk. All procedural syntax is identical to that of C, and all object-oriented syntax is an implementation of Smalltalk messaging. It is the main programming language used by Apple for OS-X and iOS and their respective APIs/ Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods.