Why .pch file not available in swift?

by

Even in Obj-C, using Macros for constants and expressions is something you shouldn’t do. Taking examples from your comments:

#define NAVIGATIONBAR_COLOR @"5B79B1"

It would be better as a category method on UIColor, for example 

+ (UIColor *) navigationBarColor {
    return [UIColor colorWith...];
}

The isPad macro should be either a plain function

BOOL isIPad() {
    return ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad);
}

or again a category method, e.g. on UIDevice

[UIDevice isIPad]

defined as

+ (BOOL)isIPad {
   return ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad);
}

The precompiled headers were never meant to share macros to all of your code. They were made to include framework headers there to speed up the compilation process. With the introduction of modules last year and now with the possibility to create custom modules, you don’t need precompiled headers any more.

In Swift the situation is the same – there are no headers and no macros so there is also no precompiled header. Use extensions, global constants or singletons instead.

More Related Contents:

  1. How to seed the Int.random method call in Swift?
  2. Concatenate dictionary values in Swift
  3. Migrating Swift code to Swift 3.0 LOADS of errors
  4. Overriding methods in Swift extensions
  5. Alternative to performSelector in Swift?
  6. NSObject subclass in Swift: hash vs hashValue, isEqual vs ==
  7. Return instancetype in Swift
  8. NSURLSession concurrent requests with Alamofire
  9. What’s the difference between “as?”, “as!”, and “as”?
  10. The “++” and “–” operators have been deprecated Xcode 7.3
  11. Changing the Status Bar Color for specific ViewControllers using Swift in iOS8
  12. Does Swift have documentation generation support?
  13. Get integer value from string in swift
  14. == overload for custom class is not always called
  15. Is it possible to replicate Swifts automatic numeric value bridging to Foundation (NSNumber) for (U)Int8/16/32/64 types?
  16. Sheet inside ForEach doesn’t loop over items SwiftUI
  17. Cannot invoke initializer for type ‘Range’ with an argument list of type ‘(Range)’
  18. UIBezierPath: How to add a border around a view with rounded corners?
  19. Get nth character of a string in Swift
  20. In SwiftUI, How do I increase the height of a button?
  21. Get associated value from enumeration without switch/case
  22. Segue from modal view to tab bar view controller and not lose tab bar
  23. Extension may not contain stored property but why is static allowed
  24. Xcode 7 compile error : “Command failed due to signal: Segmentation fault: 11”
  25. How String Comparison happens in Swift
  26. In Swift 3, how to calculate the factorial when the result becomes too high? [duplicate]
  27. Iterate through a String Swift 2.0
  28. Convert Firebase Firestore Timestamp to Date (Swift)?
  29. Custom Button in SwiftUI List
  30. CLLocationCoordinate2D can’t be instantiated

Leave a Comment