Objective C to swift

How to Migrate Objective C to Swift

Objective C to Swift

The main purpose of introducing the Swift is to deliver a simpler, new easier, more flexible programming language in order to code than Objective-C. As of now, Swift is 3.0 is the latest version of the Swift. And the Swift was announced at WWDC 2014. As the time evolved, the Swift slowly but with precision started to take over the main stream position for the iOS app development.

Some companies are continuing using the Objective-C in case, their main features are written in Objective-C which is a good decision as of the fact that mixing two languages will expand build size and there is an perennial advantage of C++ integration of the language.

Swift in objective C is an important topic and every enthusiasts of the web development world should know that. This was basically evolved to enhance the field of IOS world and the development in Macs. Let’s learn about everything that is related to the objective C to swift and all the terminologies that are involved in it.

Difference in Basics

Print

There are no more NSLog. The programmer can basically use the print function and can also use the variables in strings directly. Here is an example that is depicting the same:

let greeting = "Guten Morgen!"
let myName = "Yusuke"
print("\(greeting) Mine name ist \(myName))")

·       Strings

Handling strings is very much simpler than the Objective C as compared to the Swift. In case, the programmer wants to append strings with Objective-C, the it will look something like the code that has been depicted below:

NSString *name = @"Swift";
NSString *greeting = [@"Hi! " stringByAppendingString:[NSString stringWithFormat:@"This is %@!", name];
NSLog(@"%@", greeting);  // > "Hi! This is Swift!"

Now let’s see what it will look like with the swift:

let name = "Swift"
var greeting = "Hi! " + "This is \(name)!"
print(greeting) // > "Hi! This is Swift!\n"

Getting a subrange of a string is always a better idea as it becomes a bit more readable. With the Objective-C the programmer have to use the substringWithRange() and NSRange. That will look something like the code that has been depicted below:

[name substringWithRange:NSMakeRange(1,2)];

Now let’s see the process of getting the subrange of a string with the Swift in Objective C:

let start = str.index(str.startIndex, offsetBy: 1)
let end = str.index(str.startIndex, offsetBy: 3)
let range = start..<end
print(string.substring(with: range))

Please note that the Swift has a support of the tuples.

·       Comparison

Since when there is a transformation from the objective C to swift, the comparison part has become the easiest one. Look at the example that has been depicted below for more details:

let name1 = "Bob"
let name2 = "Tom"
print(name1 < name2) // > True

·       For loops

In this transformation, there is a great change happened that is allowing the use of the for loops. Now the programmers can use a range of numbers with for loops. Here’s a code that is depicting the same:

for i in 0..<10 {

  print(i)

}

Apart from this the programmers can now add condition to for loops with where statement that is basically opposed to using if statement. Here’s  an example that will be depicting the same:

for i in 0..<10 where i % 2 == 0{
print(i)
}

·       Switch statements

Swift switch statements generally permits the programmer to use not only the numbers but strings also. Here is an example of the same that has been depicted below:

let name = "Bob"switch name {

case "Bob":

  print("Bob")

case "Tom":

  print("Tom")

default:

  print("Does not match.")

}

Programmers can also use the range of numbers and conditions can be also be specified with the where statements. Here’s an example that is resolving that for your understanding:

let number = 9

switch number {

case 0...5:

  print("0 to 5")

case let x where x == 6:

  print("It's 6")

default:

  print("Not defined")

}

·       Functions

Unlike most of the functions in the Objective-C the function parameters are generally constants by default in the Swift. They are generally known to be equivalent of constant that has been declared with let. In case, the programmer wants to modify the parameters in functions then they can use the inout statement.

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