Does #import <UIKit/UIKit.h> on pch slow down the compile time?

ios objective-c compilation pch
Raphael Oliveira picture Raphael Oliveira · Sep 26, 2013 · Viewed 9k times · Source

I was reading this post about imports and I had one question. Does the #import that comes in the prefix.pch file by default slow down the compile time? Should I remove it and import only when necessary?

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
#endif

Answer

Ratikanta Patra picture Ratikanta Patra · Sep 26, 2013

No. It actually improves the compilation speed.

This is a nice tutorial that actually clears all the confusion over use of #import statements and .PCH files. Also it tells you in detail about something new known as "modules", introduced in iOS7.

Related questions

How to link to apps on the app store

I am creating a free version of my iPhone game. I want to have a button inside the free version that takes people to the paid version in the app store. If I use a standard link http://itunes.apple.…

Read More
How can I make a UITextField move up when the keyboard is present - on starting to edit?

With the iOS SDK: I have a UIView with UITextFields that bring up a keyboard. I need it to be able to: Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is …

Read More
How do I check if a string contains another string in Objective-C?

How can I check if a string (NSString) contains another smaller string? I was hoping for something like: NSString *string = @"hello bla bla"; NSLog(@"%d",[string containsSubstring:@"hello"]); But the closest I could find was: if ([string rangeOfString:@"hello"] == 0) { NSLog(@"…

Read More