【IOS学习】之四、协议，委托，分类粗解

@interface A:　UIView

@property(nonatic, retain) id aValueDelegate;

@end;

@implementation A

- (void) fa
{
     NSString *value = @"hello";
     [aValueDelegate aValue:value];
}

@end;

@interface B: UIView
NSString *value;
@end;

@implementation B

- (void) aValue:(NSString *)fromValue
{
     value = fromValue;
     NSLog(@"%@", value);
}

@end;

A *a = [[A alloc] init];
B *b = [[B alloc] init];
a.aValueDelegate = b;   //设置a代理委托对象为b

@interface NSString(NumberConvenience)
-(NSNumber*) lengthAsNumber;
@end

@interface NSObject (***Delegate)
//method
@end

//
//  Dog.h
//  protocol2
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Dog : NSObject

@property int ID;

@end

@interface NSObject(myCategory)

- (void)callFromNSObject;

@end

//
//  Dog.m
//  protocol2
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import "Dog.h"

@implementation Dog

- (id)init
{
    self = [super init];
    return self;
}

@end


@implementation NSObject(myCategory)

- (void)callFromNSObject
{
    NSLog(@"iam nsobject");
}

@end

//
//  Person.h
//  protocol2
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"


@interface Person : NSObject
//{
//    Dog *dog;
//}

@property Dog *dog;

- (void)callFun;

@end

//
//  Person.m
//  protocol2
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import "Person.h"

@implementation Person

@synthesize dog;

- (void) callFun
{
    NSLog(@"Call Fun!");
    [dog callFromNSObject];
}

@end

//
//  main.m
//  protocol2
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
#import "Person.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        Dog *dog = [[Dog alloc]init];
        [dog setID:10];
        Person *qy = [[Person alloc]init];
        [qy setDog:dog];
        [qy callFun];
    }
    return 0;
}

@protocol NSCopying
-(id) copyWithZone:(NSZone *) zone;
@end

@interface Car : NSObject<NSCopying>
{
// instance variable
}
// method
@end // Car

@protocol myprotocol <NSObject>
@optional
-(void)print:(int)value;
//可选的方法

@required
-(int)printValue:(int)value1 andValue:(int)value2;
//必须实现的

@end

#import <Foundation/Foundation.h>
#import "myprotocol.h"
//实现协议 myprotocol
@interface mytest : NSObject<myprotocol> 
- (void)showInfo;
@end


#import "mytest.h"

@implementation mytest
-(void)showInfo
{
     NSLog(@"I am in showInfo");
}

//实现协议必须实现的
-(int)printValue:(int)value1 andValue:(int)value2
{
     NSLog(@"print value1 %d,value2 %d",value1,value2);
     return 0;
}

//实现可选的
-(void)print:(int)value
{
     NSLog(@"print value is %d",value);
}

@end

#import <Foundation/Foundation.h>
#import "mytest.h"
#import "myprotocol.h"

int main (int argc, const char * argv[]) {
   @autoreleasepool {
          mytest *test=[[mytest alloc]init];
          [test showInfo];
          [test printValue:20 andValue:30];
          //print协议是可选的，所以在用之前一定要判断是否实现了，不然可能会出错，使用下面的方法
     //     [test print:20];
          SEL sel=@selector(print:);
          if([test respondsToSelector:sel]){
               [test print:11];
          }
     
          //用协议的方式实现
          id<myprotocol> protocol =[[[mytest alloc]init]autorelease];
          [protocol showInfo];
          [protocol printValue:200 andValue:300];
          if([protocol respondsToSelector:@selector(print:)]){
               [protocol print:111];
          }
   }
    return 0;
}

//
//  Dog.h
//  catagory
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol dogBark;

@interface Dog : NSObject
{
    int barkCount;
    NSTimer *timer;
}

@property int ID;
@property (assign)id<dogBark> delegate;     //dog master

@end

@protocol dogBark <NSObject>

- (void)bark: (Dog*)thisDog count:(int)count;

@end

//
//  Dog.m
//  catagory
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import "Dog.h"

@implementation Dog

//ID use _ID
@synthesize delegate;

- (id)init
{
    if (self = [super init]) {
        //create nstimer user, 1.0s use updateTimer:nil
        timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];
       
    }
    return self;
}

- (void) updateTimer:(id)arg
{
    barkCount++;
    NSLog(@"dog bar %d", barkCount);
   
    //user master delegate  bark:count
    [delegate bark:self count:barkCount];
}

@end

//
//  person.h
//  catagory
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"

@interface person : NSObject<dogBark>
{
    Dog *_dog;
}

@property (retain, nonatomic) Dog *dog;

@end

//
//  person.m
//  catagory
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import "person.h"

@implementation person

- (void)setDog:(Dog *)aDog
{
    if (_dog != aDog) {
        [_dog setDelegate:self];
    }
}

//dog use person interface
- (void)bark:(Dog *)thisDog count:(int)count
{
    NSLog(@"person bark: this dog %d bark %d", [thisDog ID], count);
}

@end

//
//  main.m
//  catagory
//
//  Created by peter on 14-2-25.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
#import "person.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        person *qy = [[person alloc]init];
        Dog *dog = [[Dog alloc]init];
        [dog setID:10];
        [qy setDog:dog];
       
        while (1) {
            [[NSRunLoop currentRunLoop]run];
        }
    }
    return 0;
}