Objective-C learning notes: Getting private variable values

Objective-CLearning notes acquisitionPrivate variableThe value is the content to be introduced in this article. It mainly describes how to obtainPrivate variableFor more information, see.

1. The following is a self-defined class with a private variable mt _ and the initial value is "Ha ".

 
 

  
  
@interface Mobj : NSObject {  
  
  
@private  
  
  
    NSString *mt_;  
  
  
}  
  
  
@end  
  
  
 
  
  
@implementation Mobj  
  
  
- (id)init {  
  
  
    self = [super init];  
  
  
    if (self) {  
  
  
        mt_ = [[NSString alloc] initWithString:@"Ha Ha Ha"];  
  
  
    }  
  
  
    return self;  
  
  
}  
  
  
- (void) dealloc {  
  
  
    [mt_ release];  
  
  
    [super dealloc];  
  
  
}  
  
  
@end 
 
 

2. The following code is how to get the private variable. Remember to add the header file # import <objc/runtime. h> ):

 
 

  
  
NSString *str;  
  
  
 Mobj *obj = [[Mobj alloc] init];  
  
  
 object_getInstanceVariable(obj, "mt_", (void *)&str);  
  
  
 NSLog(@"%@",str);  
  
  
 [obj release]; 
 
 

3. output result:

 
 

  
  
Ha Ha Ha 
 
 

OK.Private variable.

Summary:Objective-CLearning notes acquisitionPrivate variableThe content of the value is complete. I hope this article will help you!