Using '!' Here Is Deprecated and Will Be Removed in a Future Release - Swift 4.2

Using '!' here is deprecated and will be removed in a future release - swift 4.2

Use this code : cell. img!.sd_setImage(with: url! as URL, completed: block_image)

Suggestion: use URL instead of NSURL

            let url = URL(string: "" ) //use url String
            cell.img!.sd_setImage(with: url, completed: block_image)

Problem Using '!' will be removed in a future release

Just use

if let encodingName = response?.textEncodingName as? CFString , convertedEncoding == nil {
        convertedEncoding = String.Encoding(rawValue: CFStringConvertEncodingToNSStringEncoding(
            CFStringConvertIANACharSetNameToEncoding(encodingName)))
}

The issue is caused by casting to CFString!

Trying to understand this warning:[UITabBarItem]! Using '!' here is deprecated and will be removed in a future release

I made sure that there would not be a crash by adding a guard:

override func viewDidLoad() {
    super.viewDidLoad()

    guard let items = self.tabBar.items else { return }
    for item in items {
        if let image = item.image {
            item.image = image.imageWithColor(tintColor: self.normalTint).withRenderingMode(UIImageRenderingMode.alwaysOriginal)
        }
    }
}

Error with Spring deprecation in future releases of Swift 4.2

The solution it's pretty simple:
1. Forced unwrapping or forced up and downcasting is really really unsafe, probably this is the reason Apple is removing it.

var tabBarItems = self.tabBar.items as [UITabBarItem]!

change it for:

var tabBarItems = self.tabBar.items as [UITabBarItem]?

but tabBarItems can be nil, so I recommend a guard or something like that.

guard var tabBarItems = self.tabBar.items as [UITabBarItem]? else { return }

example code:

class C1 {

}

class C2: C1 {

}

let cc2 = C2()

var firstSelectedImage: UIImage? {
    didSet {
        if let image = firstSelectedImage {
            guard var tabBarItems = cc2 as C1? else {return}
            print(tabBarItems)
        }
    }
}

init' is deprecated warning after Swift4 convert

With Swift 4.2 and Swift 5, you can choose one of the 5 following solutions in order to solve your problem.

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#1. Using NSNumber's intValue property

import Foundation

let integer = NSNumber(value: false).intValue
print(integer) // prints 0

---

#2. Using type casting

import Foundation

let integer = NSNumber(value: false) as? Int
print(String(describing: integer)) // prints Optional(0)

---

#3. Using Int's init(exactly:) initializer

import Foundation

let integer = Int(exactly: NSNumber(value: false))
print(String(describing: integer)) // prints Optional(0)

As an alternative to the previous code, you can use the more concise code below.

import Foundation

let integer = Int(exactly: false)
print(String(describing: integer)) // prints Optional(0)

---

#4. Using Int's init(truncating:) initializer

import Foundation

let integer = Int(truncating: false)
print(integer) // prints 0

---

#5. Using control flow

Note that the following sample codes do not require to import Foundation.

Usage #1 (if statement):

let integer: Int
let bool = false

if bool {
    integer = 1
} else {
    integer = 0
}
print(integer) // prints 0

Usage #2 (ternary operator):

let integer = false ? 1 : 0
print(integer) // prints 0

Build input file cannot be found' Swift 4.2, Xcode 10.0

Moving the folders around the inspector can cause the error "Build input file cannot be found"

SWIFT 5

In Swift 5, the error came up but the identity showed no errors.

• Go under build settings and select packaging.
• Delete the current paths for Debug and Release and enter your new path where the info.plist is kept.

For example [APPROJECTNAME]/[THEINFOPLISTFOLDER]/info.plist
In the screenshot below, the path is API-client/Resources/info.plist

SWIFT 4

To fix it, go to the general tab and under identity reselect the info.plist that you like

Suppressing deprecated warnings in Xcode

Try -Wno-deprecated-declarations, or its corresponding setting in Xcode, GCC_WARN_ABOUT_DEPRECATED_FUNCTIONS (pro tip: just type in "deprecated" in the build settings to find the specific setting for this warning).

Current versions of Xcode (e.g. Xcode 9.2):

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Ancient versions of Xcode (e.g. Xcode 2.x, 3.x):

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