全局变量in iOS/Object-C (非singleton)
There is a much easier way to declare a global variable. Declare it like an ordinary C-style global, outside of any @interface...@end block in some .H file:
Code:
extern BOOL amIaVirgin;
Then define it in some .M file, but outside of any @implementation... @end block:
Code:
BOOL amIaVirgin;
Then it is a simple global that can be accessed from anywhere without reference to the AppDelegate, or any other class.
附:一般在appDelegate里声明全局变量,因为这个类在程序启动时就调用,直到程序结束才被销毁。
在appDelegate的.h的@interface...@end 上方或者.m的@implementation... @end上方
申明变量:
NSString *myGlobeString;
然后在要调用这个变量的类的.h的@interface...@end 上方或者.m的@implementation... @end上方
extern NSString *myGlobeString;
就可以在这个类里用这个全局变量了。
不过在面向对象编程里,最好不要用全局变量。