Objective-C:动态绑定

//  Complex.h
//  03-动态绑定
//
//  Created by ma c on 15/8/11.
//  Copyright (c) 2015年. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Complex : NSObject
@property(nonatomic,assign)CGFloat real;//实部
@property(nonatomic,assign)CGFloat imag;//虚部
-(instancetype)initWithReal:(CGFloat)r andImag:(CGFloat)i;
-(Complex *)add:(Complex *)c;
-(void)print;
@end

//  Complex.m
//  03-动态绑定
//
//  Created by ma c on 15/8/11.
//  Copyright (c) 2015年 bjsxt. All rights reserved.
//

#import "Complex.h"

@implementation Complex
-(instancetype)initWithReal:(CGFloat)r andImag:(CGFloat)i
{
    self = [super init];
    if(self)
    {
        _real = r;
        _imag = i;
    }
    return self;
}
-(Complex *)add:(Complex *)c
{
    CGFloat r = _real+c.real;
    CGFloat i = _imag+c.imag;
    return [[Complex alloc]initWithReal:r andImag:i];
}
-(void)print
{
    NSLog(@"%.2f*%.2fi",_real,_imag);
}
@end

//  Fraction.h
//  03-动态绑定
//
//  Created by ma c on 15/8/11.
//  Copyright (c) 2015年. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Fraction : NSObject

@property(nonatomic,assign)NSInteger numerator;//分子
@property(nonatomic,assign)NSInteger denominator;//分母
-(id)initWithNumerator:(NSInteger)n addDenominator:(NSInteger) d;
-(Fraction*) add:(Fraction*) fraction;
-(void)print;
@end

//  Fraction.m
//  03-动态绑定
//
//  Created by ma c on 15/8/11.
//  Copyright (c) 2015年 bjsxt. All rights reserved.
//

#import "Fraction.h"

@implementation Fraction
-(id)initWithNumerator:(NSInteger)n addDenominator:(NSInteger) d
{
    self = [super init];
    if(self)
    {
        _numerator = n;
        _denominator = d;
    }
    return self;
}
-(Fraction*) add:(Fraction*) fraction
{
   NSInteger n = _numerator*fraction.denominator+fraction.numerator*_denominator;
   NSInteger d = _denominator*fraction.denominator;
    
   return [[Fraction alloc]initWithNumerator:n addDenominator:d];
}
-(void)print
{
    NSLog(@"%ld/%ld",_numerator,_denominator);
}
@end


//  main.m
//  03-动态绑定
//
//  Created by ma c on 15/8/11.
//  Copyright (c) 2015年. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Fraction.h"
#import "Complex.h"
int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        //测试分数类
        Fraction *f1 = [[Fraction alloc]initWithNumerator:1
                                           addDenominator:2];
        [f1 print];
        
        Fraction *f2 = [[Fraction alloc]initWithNumerator:2
                                           addDenominator:3];
        [f2 print];
        
        Fraction *f3 = [f1 add:f2];
        [f3 print];
        
        //测试复数类
        Complex *c1 = [[Complex alloc]initWithReal:5.0 andImag:3.0];
        [c1 print];
        
        Complex *c2 = [[Complex alloc]initWithReal:4.3 andImag:2.5];
        [c2 print];
        
        Complex *c3 = [c1 add: c2];
        [c3 print];
        
        
        //测试动态绑定
        id pObj = nil;
        pObj = f3;
        [f3 print];
        
        pObj = c3;
        [c3 print];
        
        id arr[3] = {c1,f1,@""};
        for(int i=0;i<3;i++)
        {
            //运行时检查
            /*if([arr[i] isKindOfClass:[Fraction class]]==YES || [arr[i] isKindOfClass:[Complex class]]==YES)
            */
            if([arr[i] respondsToSelector:@selector(print)]==YES)
            {
              [arr[i] print];
              //SEL sel = @selector(print);
              //[arr[i] performSelector:@selector(print)];
            }
            
            
        }
    }
    return 0;
}