iOS: Why can't I set nil to NSDictionary value?

iOS: Why can't I set nil to NSDictionary value?

iphone ios nsdictionary null

ios

Is it safe to force unwrap variables that have been optionally accessed in the same line of code?

ios swift memory-management null optional

ios

How to Nil a object in Swift

ios swift cocoa-touch null

ios

How to include null value in the JSON via NSJSONSerialization?

objective-c ios json null nsjsonserialization

ios

Check if CGRect null in getter

ios ios6 null cgrect cgrectmake

ios

Following in app purchase, app crashing on startup. productIdentifier=nil?

ios in-app-purchase null storekit

ios

When does NSURLConnection's initWithRequest return nil

iphone ios nsurlconnection null

ios

Possible to set singleton back to nil?

ios singleton null

ios