Interested to Buy Any Domain ? << Click Here >> for more details...
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?
- 1 Answers
- 3138 Views
- I also Faced
- E-Mail Answers
Answer / iosraj
The reason is that swift automatically bridges:
number types to NSNumber
strings to NSString
arrays to NSArray
dictionaries to NSDictionary
which are all reference types.
| Is This Answer Correct ? | 1 Yes | 0 No |
What is $0 in swift?
What do you mean by a deinitializer?
The following code snippet results in a compile time error: struct IntStack { var items = [Int]() func add(x: Int) { items.append(x) // Compile time error here. } } Explain why a compile time error occurs. How can you fix it?
Mention what are the collection types available in Swift?
How many access levels are present in swift?
What lazy stored properties is and when it is useful?
Does swift have abstract classes?
Explain swift vs objective-c.
How do you make a swift bridging header?
What is property observer in swift?
Why we use delegates in swift?
What are the collection types that are available in swift?
Apple iOS 
