#import#import "Dog.h"
@interface Person : NSObject
@property(nonatomic,strong)Dog *dog;
@end
#import "Person.h"
@interface Person ()
@property(nonatomic,strong)NSString *sex;
@end
@implementation Person
-(NSString *)description
{
return [NSString stringWithFormat:@"sex === %@",_sex];
}
-(void)setValue:(id)value forUndefinedKey:(nonnull NSString *)key
{
NSLog(@"你给不存在的属性赋值了");
}
-(id)valueForUndefinedKey:(NSString *)key
{
return @"没有你要取的属性";
}
#import@interface Dog : NSObject
@property(nonatomic,strong)NSString *name;
@property(nonatomic,strong)NSString *age;
@end
#import#import "Person.h"
#import "Dog.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
Person *person = [[Person alloc]init];
[person setValue:@"北京" forKey:@"sex"];
NSLog(@"%@",[person valueForKey:@"sex"]);
[person setValue:@"北京" forKey:@"aaa"];
NSLog(@"%@",[person valueForKey:@"aaa"]);
person.dog = [[Dog alloc]init];
[person setValue:@"aaa" forKeyPath:@"dog.name"];
NSLog(@"%@",[person valueForKeyPath:@"dog.name"]);
}
return 0;
}
