相关疑难解决方法(0)

在尝试使用KVC访问ivars之后,我注意到私人和受保护的ivars没有保护.我把它放在ivar(私人或受保护的关键字)前面并不重要 - 当使用KVC方法"setValue"时,ivar总是公共的ivar.这是我的代码,其中所有七个ivars和属性都可以在类实例之外更改:

//************ interface file ***************//
@interface MyClass : NSObject {
@public    
  NSNumber *public_num;
@protected 
  NSNumber *protected_num;
@private 
  NSNumber *private_num;
  NSNumber *private_property;
}
@property (retain) NSNumber *public_property;
@property (retain) NSNumber *private_property;
@end

//********* implementation file *********//
@interface MyClass(){
@private
  NSNumber *very_private_num;
}
@property (retain) NSNumber *very_private_property;
@end

@implementation MyClass
@synthesize public_property, private_property, very_private_property;
@end

//****** main **********//
MyClass *myClass = [[MyClass alloc] init];

[myClass setValue:[NSNumber numberWithInt:1] forKey:@"public_num"];
[myClass setValue:[NSNumber numberWithInt:2] forKey:@"protected_num"];
[myClass setValue:[NSNumber numberWithInt:3] forKey:@"private_num"];
[myClass setValue:[NSNumber numberWithInt:4] forKey:@"public_property"]; …