iOS.常用設計模式.02.委託模式

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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 方法實現-(void) sleep{    NSLog(@"sleep...");}-(void) eat{    NSLog(@"eat...");}-(void) work{    NSLog(@"work...");}@end