Merging NSArrays in Objective-C
Just use [newArray addObjectsFromArray:anArray];
foundation
Error message “could not build module ‘Foundation'”
I was able to solve this using the solution provided in this Apple Support Communities thread: The real problem here is at Build Settings in the session: Apple LLVM 5.0 – Language – Modules, we should set Enable Modules (C and Objective C) to NO
How to use NSIndexSet
it would be the proper way: NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 3)]; or you can use the NSMutableIndexSet for the random indexes: NSMutableIndexSet *mutableIndexSet = [[NSMutableIndexSet alloc] init]; [mutableIndexSet addIndex:0]; [mutableIndexSet addIndex:2]; [mutableIndexSet addIndex:9]; etc.
CoreFoundation vs Foundation
In a technical sense, yes, it is faster, for exactly that reason. In a practical sense, no, it’s not faster. For one thing, the speed difference is tiny. We’re talking milliseconds saved over the life of the entire process. The savings might be bigger on the iPhone, but it’s still pretty much the tiniest speed … Read more
What am I doing wrong with allowsFractionalUnits on NSDateComponentsFormatter?
According to Open Radar #32024200: After doing some digging (disassembling Foundation), it looks like every call to -[_unitFormatter stringFromNumber:] in -[NSDateComponentsFormatter _stringFromDateComponents:] is passed an +[NSNumber numberWithInteger:] which drops floating point data. You’re not doing anything wrong. The flag is simply broken.
Can’t pass Date to NSPredicate(format: …) without “as CVarArg”
The %@ format expect a Foundation object as argument, compare “Predicate Format String Syntax” in the “Predicate Programming Guide”. Therefore you have to cast the overlay type Date back to its Foundation counterpart NSDate: let endDate = Date() let pred = NSPredicate(format: “endDate == %@”, endDate as NSDate)
Swift class vs Cocoa Touch Class in Xcode6
There is no difference between the two different templates other than the code they put into the file by default. Like you noticed, they both have the same extension and they are both plain text files – the compiler does not treat them any differently. The general rule of thumb is to only import a … Read more
import Swift vs import Foundation
Yes, you will only need import Foundation if you want to access NSObject or one of its subclasses. Foundation is the framework that brings in that class hierarchy. However, it’s highly likely that in a project you’ll need more than just import Swift. Like Rob commented, import UIKit is also a nice option. In case … Read more