iOS.常用设计模式.02.委托模式

WTDelegate

#import <Foundation/Foundation.h>

@protocol WTDelegate <NSObject>
@required
- (void)sleep;
- (void)eat;
- (void)work;
@end

WTPhilosopher.h

#import <Foundation/Foundation.h>

#import "WTDelegate.h"

@interface WTPhilosopher : NSObject

{

    NSTimer *timer;

    int count;

}

@property (nonatomic,weak) id<WTDelegate> delegate;
- (void)start;
- (void)handle;
@end

WTPhilosopher.m

#import "WTPhilosopher.h"

@implementation WTPhilosopher

@synthesize delegate;
- (void)start

{

    count = 0;

    timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(handle) userInfo:nil repeats:YES];

}

- (void)handle

{

    switch (count) {

        case 0:

            [self.delegate sleep];

            count++;

            break;

        case 1:

            [self.delegate eat];

            count++;

            break;

        case 2:

            [self.delegate work];

            [timer invalidate];

            break;
default:

            break;

    }

}
@end

WTViewController.m

#import "WTViewController.h"

#import "WTPhilosopher.h"

@interface WTViewController ()
@end
@implementation WTViewController
- (void)viewDidLoad

{

    [super viewDidLoad];
WTPhilosopher *philosopher = [[WTPhilosopher alloc] init];

    philosopher.delegate = self;

    [philosopher start];

}
- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}
#pragma -- WTDelegate 方法实现

-(void) sleep

{

    NSLog(@"sleep...");

}
-(void) eat

{

    NSLog(@"eat...");

}
-(void) work

{

    NSLog(@"work...");

}
@end

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