How to check if an NSDictionary or NSMutableDictionary contains a key?

How to check if an NSDictionary or NSMutableDictionary contains a key?

objective-c foundation

objective-c

How to Get the Title of a HTML Page Displayed in UIWebView?

ios objective-c iphone uiwebview foundation

objective-c

Adding an object at a specific index of an NSMutableArray

objective-c nsmutablearray foundation

objective-c

Difference between Foundation Framework and Core Foundation Framework?

objective-c cocoa cocoa-touch foundation core-foundation

objective-c

Is there a constant for the maximum CGFloat value?

objective-c ios foundation core-foundation cgfloat

objective-c

import Swift vs import Foundation

ios objective-c swift import foundation

objective-c

What am I doing wrong with allowsFractionalUnits on NSDateComponentsFormatter?

ios objective-c swift foundation nsdatecomponentsformatter

objective-c

Does NSSet's containsObject: test for pointer equality or value equality?

objective-c cocoa collections foundation nsset

objective-c

Merging NSArrays in Objective-C

objective-c cocoa foundation

objective-c

"could not build module 'Foundation'"

objective-c foundation

objective-c

Keep NSThread alive and run NSRunLoop on it

objective-c cocoa nsthread foundation nsrunloop

objective-c

How to check for API availability in Xcode 9

objective-c ios10 foundation

objective-c

What is the logic behind having a mutable and immutable versions of classes like NSArray, NSDictionary etc in Objective C?

iphone ios objective-c class-design foundation

objective-c

What is the data structure behind NSMutableArray?

objective-c data-structures nsmutablearray foundation

objective-c

Why are NSRect, NSPoint, etc. structs, not classes?

objective-c class struct foundation

objective-c