iOS开发——语法OC篇&BOOL / bool / Boolean / NSCFBoolean四者区别

Name	Typedef	Header	True Value	False Value
BOOL	signed char	objc.h	YES	NO
bool	_Bool (int)	stdbool.h	true	false
Boolean	unsigned char	MacTypes.h	TRUE	FALSE
NSNumber	__NSCFBoolean	Foundation.h	@(YES)	@(NO)
CFBooleanRef	struct	CoreFoundation.h	kCFBooleanTrue