訪問變量

Question

//In class2.m File, 

HelloWorldLayer myHelloWorldLayer = [[HelloWorldLayer alloc]init]; 
myHelloWorldLayer.myInt =100; 
     NSLog(@"%i",myHelloWorldLayer.myInt); 

//In HelloWorldLayer.h 
int _myInt; 
@property (nonatomic,readwrite) int myInt; 


//In HelloWorldLayer.m 
@synthesize myInt= _myInt; 

NSLog(@"%i",self.myInt); 

當我運行的HelloWorld層，輸出爲0。我改變了現場的Class2文件，並更改敏到100，輸出是100但是，當我更換現場回HelloWorldLayer輸出爲0再次而不是100.請幫助，謝謝。

Answer 1

// in HelloWorldLayer.h 
// these are static variables. 
// You would reference them like so: 
// HelloWorldLayerStatic.myInt = x; 
static struct { 
    int myInt; 
} HelloWorldLayerStatic; 

然後，當你要提到self.myInt或myLayer.myInt，你會參考HelloWorldLayerStatic.myInt。這有點破解，但有效。