Can NSUInteger be nil?

Can NSUInteger be nil?

An NSUInteger is never nil because it is an integer, not a pointer.

How do I find my NSNumber value?

To check the numeric value stored in an NSNumber , you have to call one of the methods which give you a primitive type. Because sending a message to a nil reference returns 0 , you can take a shortcut: if ([_item.id intValue] != 0) …

How do you find nil in Objective C?

length == 0) . object. length will return 0 if object == nil , so this test covers nil objects and strings with length 0. If you treat a string of length 0 different from a nil string, just check if object == nil .

How do I check NSNull?

We can use NSNull to represent nil objects in collections, and we typically see NSNull when we convert JSON to Objective-C objects and the JSON contained null values. Our preferred way to check if something is NSNull is [[NSNull null] isEqual:something] .

What is NSInteger in Swift?

NSInteger is a type definition that describes an integer – but it is NOT equivalent to int on 64-bit platforms. You can examine the typedef by cmd-clicking on NSInteger in Xcode. It has methods to convert between different types and methods to retrieve a string representation of your numeric value.

What is NSNumber in Objective-C?

NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .

How do you check if a string is nil in Objective C?

30 Answers. You can check if [string length] == 0 . This will check if it’s a valid but empty string (@””) as well as if it’s nil, since calling length on nil will also return 0.

How do I check if NSString is null in Objective C?

5 Answers

1. No need to use isEqual . == works just fine, since [NSNull null] is a singleton.
2. Create a category on NSString and include this method: + (BOOL)isEmpty:(NSString *)string {return !
3. if (myString == (NSString*)[NSNull null]) if you do not cast it then there is a warning just pointing that out.

What is null in Swift?

In Objective-C, you work with references to objects by using pointers that can be null, called nil in Objective-C. In Swift, all values — including object instances — are guaranteed to be non-null. Instead, you represent a value that could be missing as wrapped in an optional type.

What is Nsnull?

A singleton object used to represent null values in collection objects that don’t allow nil values.

Is NSInteger primitive?

5 Answers. NSNumber is a class, not a primitive, and is used when you need to put raw numbers into dictionaries, arrays, or otherwise encapsulate them. NSInteger , NSUInteger , CGFloat , etc are simple types and correspond (on 32-bt systems like the iPhone) to int , unsigned int and float .