What are the tools that are required to develop ios applications?

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What is framework in swift?

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Where can we test the apple iphone apps if we don’t have an ios device?

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What is unowned in swift?

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How do you make a bridging header in swift?

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Is swift hard to learn?

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Swift defines the AnyObject type alias to represent instances of any reference type, and it’s internally defined as a protocol. Consider the following code: var array = [AnyObject]() struct Test {} array.append(Test()) This code generates a compilation error, with the following error message: Type 'Test' does not conform to protocol 'AnyObject' The failure is obvious because a struct is a value and not a reference type, and as such it doesn’t implement and cannot be cast to the AnyObject protocol. Now consider the following code: var array = [AnyObject]() array.append(1) array.append(2.0) array.append("3") array.append([4, 5, 6]) array.append([7: "7", 8: "8"]) struct Test {} array.append(Test()) The array array is filled in with values of type respectively int, double, string, array and dictionary. All of them are value types and not reference types, and in all cases no error is reported by the compiler. Why?

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Why does apple use swift?

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What does appdelegate swift do?

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What is dynamic dispatch swift?

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The String struct doesn’t provide a count or length property or method to count the number of characters it contains. Instead a global countElements<T>() function is available. When applied to strings, what’s the complexity of the countElements function: O(1) O(n) and why?

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What is nil-coalescing operator?

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