What is an NSNumber?
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 .
What is NSTimeInterval?
A NSTimeInterval value is always specified in seconds; it yields sub-millisecond precision over a range of 10,000 years. On its own, a time interval does not specify a unique point in time, or even a span between specific times.
What is TimeInterval in Swift?
Time Intervals On the other hand, you might want a measure of time. For this, use the type TimeInterval . This is a measure of time using seconds. They are of Double type. I’ll set a few constants using time intervals for day, hour and minute.
Is time interval in seconds Swift?
A TimeInterval value is always specified in seconds; it yields sub-millisecond precision over a range of 10,000 years.
Is CGFloat a Double?
As @weichsel stated, CGFloat is just a typedef for either float or double . You can see for yourself by Command-double-clicking on “CGFloat” in Xcode — it will jump to the CGBase.
What is timeIntervalSince1970?
timeIntervalSince1970 is the number of seconds since January, 1st, 1970, 12:00 am (mid night) timeIntervalSinceNow is the number of seconds since now.
What is a CGFloat?
A CGFloat is a specialized form of Float that holds either 32-bits of data or 64-bits of data depending on the platform. The CG tells you it’s part of Core Graphics, and it’s found throughout UIKit, Core Graphics, Sprite Kit and many other iOS libraries.
What is epoch date?
In a computing context, an epoch is the date and time relative to which a computer’s clock and timestamp values are determined. The epoch traditionally corresponds to 0 hours, 0 minutes, and 0 seconds (00:00:00) Coordinated Universal Time (UTC) on a specific date, which varies from system to system.
What is nsinteger used for?
NSInteger Used to describe an integer independently of whether you are building for a 32-bit or a 64-bit system. You can use NSInteger any place you use an int without converting it. Here’s a good reason to want to convert a NSUinteger to an int: value comparisons.
Can I convert a nsinteger to an int value?
[a value] suggests you expect a to be an object, but that its an NSInteger at the moment. “Converting” to an int will not solve that problem. – Mike Abdullah Nov 18 ’09 at 11:23 Add a comment | 4 Answers 4 ActiveOldestVotes 209 Ta da: NSInteger myInteger = 42; int myInt = (int) myInteger;
What is the size of the nsinteger myInteger?
Ta da: NSInteger myInteger = 42; int myInt = (int) myInteger; NSIntegeris nothing more than a 32/64 bit int. (it will use the appropriate size based on what OS/platform you’re running)
Is nsinteger a 32-bit or 64-bit integer?
When building 32-bit applications, NSInteger is a 32-bit integer. A 64-bit application treats NSInteger as a 64-bit integer. The maximum value for an NSInteger.
What is the objective C directive for a selector literal?
In Objective-C, any character, numeric or boolean literal prefixed with the ‘@’ character will evaluate to a pointer to an NSNumber object initialized with that value.
What does NS mean in Swift?
NeXTSTEP
The Foundation Kit, or just Foundation for short, is an Objective-C framework in the OpenStep specification. It provides basic classes such as wrapper classes and data structure classes. This framework uses the prefix NS (for NeXTSTEP). It is also part of Cocoa and of the Swift standard library.