Is each value of a typedef enum
treated as an int
?
E.g., given the following typedef enum
:
// UIView.h
typedef enum {
UIViewAnimationCurveEaseInOut,
UIViewAnimationCurveEaseIn,
UIViewAnimationCurveEaseOut,
UIViewAnimationCurveLinear
} UIViewAnimationCurve;
How do I know which method to use to create an NSNumber
?
+ (NSNumber *)numberWithShort:(short)value;
+ (NSNumber *)numberWithUnsignedShort:(unsigned short)value;
+ (NSNumber *)numberWithInt:(int)value;
+ (NSNumber *)numberWithUnsignedInt:(unsigned int)value;
+ (NSNumber *)numberWithLong:(long)value;
+ (NSNumber *)numberWithUnsignedLong:(unsigned long)value;
+ (NSNumber *)numberWithLongLong:(long long)value;
+ (NSNumber *)numberWithUnsignedLongLong:(unsigned long long)value;
+ (NSNumber *)numberWithInteger:(NSInteger)value NS_AVAILABLE(10_5, 2_0);
+ (NSNumber *)numberWithUnsignedInteger:(NSUInteger)value NS_AVAILABLE(10_5, 2_0);
I think +[NSNumber numberWithInt:]
is the correct method to use because the accepted answer to Best way to implement Enums with Core Data uses it. E.g.:
[NSNumber numberWithInt:UIViewAnimationCurveLinear]
But, if +[NSNumber numberWithInt:]
is correct, then why?
For a bitwise enum
, e.g.:
enum {
UIViewAutoresizingNone = 0,
UIViewAutoresizingFlexibleLeftMargin = 1 << 0,
UIViewAutoresizingFlexibleWidth = 1 << 1,
UIViewAutoresizingFlexibleRightMargin = 1 << 2,
UIViewAutoresizingFlexibleTopMargin = 1 << 3,
UIViewAutoresizingFlexibleHeight = 1 << 4,
UIViewAutoresizingFlexibleBottomMargin = 1 << 5
};
typedef NSUInteger UIViewAutoresizing;
I'm guessing that +[NSNumber numberWithUnsignedInteger:]
is the correct method to use because there is an explicit NSUInteger
after typedef
. Correct? E.g.:
[NSNumber numberWithUnsignedInteger:UIViewAutoresizingNone]
Nowadays modern syntax can be used:
@(UIViewAnimationCurveLinear)