Swift Language

Swift 2.2 Warnings and It's Solutions – Xcode 7.3

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apple_swift_logo

Xcode 7.3 came with Swift 2.2 Version. I just updated to Xcode 7.3 and found following warnings because of Swift version change.

List of warnings with it’s solution:

  1. ‘var’ parameters are deprecated and will be removed in Swift 3

    2. Warning Function Var
    Warning Function Var

    Warning with:
    [code language=”obj-c”]
    func functionTest(var param:String) {
    print(param)
    }
    [/code]
    Solution:
    [code language=”obj-c”]
    func functionTest(param:String) {
    print(param)
    }
    [/code]
    If you want to update that variable inside the function then you have to create copy of that variable to do operations on that.

  2. Use of string literal for Objective-C selectors is deprecated; use ‘#selector’ instead

    3. Warning Selector
    Warning Selector

    Warning with:
    [code language=”obj-c”]
    btn.addTarget(self, action: "functionName", forControlEvents: UIControlEvents.TouchUpInside)
    [/code]
    OR
    [code language=”obj-c”]
    btn.addTarget(self, action: Selector("functionName"), forControlEvents: UIControlEvents.TouchUpInside)
    [/code]
    Solution:
    [code language=”obj-c”]
    btn.addTarget(self, action: #selector(ViewController.functionName), forControlEvents: UIControlEvents.TouchUpInside)
    [/code]
    Apple Documentation : Added information about the #selector syntax for Objective-C selectors to the Selector Expression section.

  3. ‘++’ is deprecated: it will be removed in Swift 3

    4. Warning ++
    Warning ++

    Warning with:
    [code language=”obj-c”]
    var i = 0
    for str in arrStr {
    print(str)
    i++
    }
    [/code]
    Solution:
    [code language=”obj-c”]
    var i = 0
    for str in arrStr {
    print(str)
    i += 1
    }
    [/code]
    Apple Documentation : Removed discussion of C-style for loops, the ++ prefix and postfix operators, and the — prefix and postfix operators.

  4. C-style for statement is deprecated and will be removed in a future version of Swift

    5. Warning For Statement
    Warning For Statement

    Warning with:
    [code language=”obj-c”]
    for var i=0; i<arrStr.count; i += 1 {
    print(arrStr[i])
    }
    [/code]
    Solution:
    [code language=”obj-c”]
    for i in 0 ..< arrStr.count {
    print(arrStr[i])
    }
    [/code]

  5. __FILE__ is deprecated and will be removed in Swift 3, please use #file

    6. Warning __FILE__
    Warning __FILE__

    Warning with:
    [code language=”obj-c”]
    __FILE__
    [/code]
    Solution:
    [code language=”obj-c”]
    #file
    [/code]

More swift tutorials/articles are available here.
Happy Coding 🙂

Swift Resources #3

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Swift Resources
Swift Resources

Swift Useful Resources:

Posted by @NatashaTheRobot in Issue No. 80
If I got time then I will try to post the Swift/Objective-C useful resources everyday.
Happy Coding 🙂

Swift Resources #2 – for Animation

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Swift Resources
Swift Resources

Swift Useful Animation Resources:

  • Spring A library to simplify iOS animations in Swift.
  • Animo Bring life to CALayers with SpriteKit-like animation builders
  • Advance A powerful animation framework for iOS and OS X.
  • CKWaveCollectionViewTransition Cool wave like transition between two or more UICollectionView
  • EasyAnimation A Swift library to take the power of UIView.animateWithDuration(_:, animations:…) to a whole new level – layers, springs, chain-able animations and mixing view and layer animations together!
  • Cheetah Easy animation library on iOS with Swift2

If I got time then I will try to post the Swift/Objective-C useful resources everyday.
Happy Coding 🙂

Swift Resources #1

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Swift Resources
Swift Resources

Swift Useful Resources:

  • FolioReaderKit FolioReaderKit is an ePub reader and parser framework for iOS written in Swift.
  • KZLinkedConsole Clickable links in your Xcode console, so you never wonder which class logged the message.
  • Chatto A lightweight framework to build chat applications, made in Swift.
  • PFColorHash Generate color based on the given string.
  • SwiftCharts Easy to use and highly customizable charts library for iOS.

If I got time then I will try to post the Swift/Objective-C useful resources everyday.
Happy Coding 🙂

How to create a wrapper for Alamofire and SwiftyJSON? Swift – iOS

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This blogpost updated with Swift 3 – Xcode 8 – iOS 10 – Alamofire 4.0

AFWrapper
AFWrapper

I have posted a basic tutorial about Alamofire and SwiftyJSON How to use Alamofire and SwiftyJSON with Swift?
And some day before we have learned about Use of Blocks(Closures) or Completion Handlers with Function in Swift – iOS
Let’s combine both the topics to make a WRAPPER of Alamofire and SwiftyJSON.

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Use of Blocks(Closures) or Completion Handlers with Function in Swift – iOS

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Blocks in Objective-C

In Objective-C we are using the blocks(completion handlers) with functions as follows :

[code language=”obj-c”]
– (void)yourFunctionName:(NSString *)yourString withCompletionHandler:(void (^)(NSString *yourResult))block;
[/code]

Closures in Swift

Closures are self-contained blocks of functionality that can be passed around and used in your code. Closures in Swift are similar to blocks in C and Objective-C and to lambdas in other programming languages.

Syntax with Function

[code language=”obj-c”]
func yourFunctionName(parameter:Type, … , withCompletionHandler:(result:Type) -> Void)
[/code]
For more closure syntax : goshdarnclosuresyntax.com

Example

Function Definition:
[code language=”obj-c”]
func closureReturn(isTest:Bool, withCompletionHandler:(result:String) -> Void) {
if(isTest){
withCompletionHandler(result: "Yes")
}
else{
withCompletionHandler(result: "No")
}
}
[/code]
Calling Function:
[code language=”obj-c”]
closureReturn(true) { (result) -> Void in
print(result)
}
[/code]
Output should be respective to value true/false.

In next post I will write a tutorial on a wrapper class for Alamofire with use of SwiftyJSON by using closures.

It will be related to this post How to use Alamofire and SwiftyJSON with Swift? – Swift 2 – iOS 9 – Xcode 7

Happy Coding 🙂

Work with Core Data in Swift Language

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Lets take a brief idea about how to use core data with swift language.

Create a new project by check on Use Core Data.

Core Data Project Setting
Core Data Project Setting

It will create the basic methods of core data in to the AppDelegate.swift

There is core data model called {YOUR-PROJECT.xcdatamodeld} will be there with the project.

It will be look like as follows :

Core Data Model
Core Data Model

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Use of constant (#define) in Swift Language – iOS

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Swift Constant Test
Swift Constant Test

In Objective-C we are using a header file to create constant variables like as
[code lang=”obj-c”]
// Objective-C
#define APP_ALERT_TITLE "Objective-C Constant"
[/code]
Swift has new syntax to define the constant (#define)
[code lang=”obj-c”]
// Swift
let APP_ALERT_TITLE = "Swift Constants"
[/code]

Lets try

Create a swift file with the constants

[code lang=”obj-c”]
import Foundation
class Constants {
// MARK: List of Constants
static let APP_ALERT_TITLE = "Swift Constants"
static let SAMPLE_MESSAGE = "The alert is working !!"
}
[/code]
Note : Here the MARK statement is also changed.
[code lang=”obj-c”]
// Objective-C
#pragma mark –
#pragma mark List of Constants
[/code]
[code lang=”obj-c”]
// Swift
// MARK: List of Constants
[/code]

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How to use Alamofire and SwiftyJSON with Swift? – Swift 3 – iOS 10 – Xcode 8

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Swift JSON
Swift JSON

Alamofire is an HTTP networking library written in Swift.
SwiftyJSON makes it easy to deal with JSON data in Swift.

Read more