day05-02-选择器

Objective-c

//  main.m
//  day05-02-选择器
//
//  Created by Aaron on 15/7/7.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
//选择器
#import "Dog.h"
#if 0
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //SEL 选择器类型
        //选择器就是一个容器----专门用来存放消息
        Dog *dog = [[Dog alloc] init];
        //[dog bark];
        //[dog isEqualToString:@""];
        SEL bl = @selector(bark);
        //SEL bl = @selector(isEqualToString:);
        //对象去触发选择器里面存储的方法
        //[dog performSelector:@selector(bark)];
        //[dog barkByTimes:2];
        //有一个参数的方法
        [dog performSelector:@selector(barkByTimes:) withObject:@2];
        //有两个参数的方法
        [dog performSelector:@selector(barkByTimes:andNum2:) withObject:@2 withObject:@4];
        MyNumber *num = [[MyNumber alloc] initWithNum1:@10 andNum2:@11 andNum3:@12];
        [dog performSelector:@selector(barkByMyNumber:) withObject:num];
    }
    return 0;
}
#endif
//检测某个对象是否实现了某个方法
#import "Cat.h"
#if 0
int main()
{
    Dog *dog = [[Dog alloc] init];
    Cat *cat = [[Cat alloc] init];
    NSArray *array = @[@1,@"2",dog,@1,cat];
    for(id obj in array)
    {
        //检测对象是否能响应某个消息
        if([obj respondsToSelector:@selector(bark)])
        {
            [obj bark];
        }
    }
}
#endif
//控制控件的事件响应
//不同的对象触发事件,有不同的响应
#import "NSMutableArray+MyArraySort.h"
int main()
{
    NSMutableArray *array1 = [NSMutableArray array];
    NSMutableArray *array2 = [NSMutableArray array];
    for(int i = 0; i < 10; i++)
    {
        Dog *dog = [[Dog alloc] init];
        [dog setAge:i];
        [array1 addObject:dog];
        Cat *cat = [[Cat alloc] init];
        [cat setAge:i];
        [array2 addObject:cat];
    }
//    [array1 sortUsingSelector:@selector(sortByAgeWithOtherDog:)];
//    [array2 sortUsingSelector:@selector(sortByAgeWithOtherDog:)];
    [array1 mySortUsingSelector:@selector(sortByAgeWithOtherDog:)];
    [array2 mySortUsingSelector:@selector(sortByAgeWithOtherDog:)];
    NSLog(@"%@\n%@",array1,array2);
}

#import <Foundation/Foundation.h>
@interface NSMutableArray (MyArraySort)
-(void)mySortUsingSelector:(SEL)sel;
@end

#import "NSMutableArray+MyArraySort.h"
@implementation NSMutableArray (MyArraySort)
-(void)mySortUsingSelector:(SEL)sel
{
    for(int i = 0; i < [self count]-1; i++)
    {
        for(int j = i+1; j < [self count]; j++)
        {
            id obj1  = [self objectAtIndex:i];
            id obj2 = [self objectAtIndex:j];
            if([obj1 performSelector:sel withObject:obj2])
            {
                [self exchangeObjectAtIndex:i withObjectAtIndex:j];
            }
        }
    }
}
@end

#import <Foundation/Foundation.h>
@interface Cat : NSObject
{
    NSInteger _age;
}
-(BOOL)sortByAgeWithOtherDog:(Cat *)cat;
-(void)setAge:(NSInteger)age;
-(void)bark;
@end

#import "Cat.h"
@implementation Cat
-(void)bark
{
    NSLog(@"喵喵喵...");
}
-(void)setAge:(NSInteger)age
{
    _age = age;
}
-(NSInteger)age
{
    return _age;
}
-(BOOL)sortByAgeWithOtherDog:(Cat *)cat
{
    return _age < [cat age];
}
-(NSString *)description
{
    return [NSString stringWithFormat:@"cat : age--%ld",_age];
}
@end

#import <Foundation/Foundation.h>
#import "MyNumber.h"
@interface Dog : NSObject
{
    NSInteger _age;
}
-(BOOL)sortByAgeWithOtherDog:(Dog *)dog;
-(void)setAge:(NSInteger)age;
-(void)bark;
-(void)barkByTimes:(NSNumber *)times;
-(void)barkByTimes:(NSNumber *)times andNum2:(NSNumber *)num2;
-(void)barkByTimes:(NSNumber *)times andNum2:(NSNumber *)num2 andNum3:(NSNumber *)num3;
-(void)barkByMyNumber:(MyNumber *)myNum;
@end

#import "Dog.h"
@implementation Dog
-(void)bark
{
    NSLog(@"汪汪汪....");
}
-(void)barkByTimes:(NSNumber *)times
{
    for(int i = 0; i < [times integerValue]; i++)
    {
        NSLog(@"汪汪汪...%d",i);
    }
}
-(void)barkByTimes:(NSNumber *)times andNum2:(NSNumber *)num2
{
    NSLog(@"num1 = %@  num2 = %@",times,num2);
}
-(void)barkByTimes:(NSNumber *)times andNum2:(NSNumber *)num2 andNum3:(NSNumber *)num3
{
    NSLog(@"num1 = %@ num2=%@ num3=%@",times,num2,num3);
}
-(void)barkByMyNumber:(MyNumber *)myNum
{
    [self barkByTimes:[myNum num1] andNum2:[myNum num2] andNum3:[myNum num3]];
}
-(void)setAge:(NSInteger)age
{
    _age = age;
}
-(NSInteger)age
{
    return _age;
}
-(BOOL)sortByAgeWithOtherDog:(Dog *)dog
{
    return _age > [dog age];
}
-(NSString *)description
{
    return [NSString stringWithFormat:@"dog : age--%ld",_age];
}
@end

#import <Foundation/Foundation.h>
@interface MyNumber : NSObject
{
    NSNumber *_num1;
    NSNumber *_num2;
    NSNumber *_num3;
}
-(instancetype)initWithNum1:(NSNumber *)num1 andNum2:(NSNumber *)num2 andNum3:(NSNumber *)num3;
-(NSNumber *)num1;
-(NSNumber *)num2;
-(NSNumber *)num3;
@end

#import "MyNumber.h"
@implementation MyNumber
-(instancetype)initWithNum1:(NSNumber *)num1 andNum2:(NSNumber *)num2 andNum3:(NSNumber *)num3
{
    if(self = [super init])
    {
        _num1 = num1;
        _num2 = num2;
        _num3 = num3;
    }
    return self;
}
-(NSNumber *)num1
{
    return _num1;
}
-(NSNumber *)num2
{
    return _num2;
}
-(NSNumber *)num3
{
    return _num3;
}
@end