實現的代碼如下：

定義協議：

#import?<UIKit/UIKit.h>

@protocol?NoteDelegate

//回調函數

-(void)messageCallBack:(NSString?*)string;

@end

調用協議

????#import?<Foundation/Foundation.h>

????#import?"NoteDelegate.h"

????@interface?ManagerMessage?:?NSObject?{

????????id<NoteDelegate>?*noteDelegate;

????}

????@property?(nonatomic,retain)?id<NoteDelegate>?*noteDelegate;

????-(void)startThread;

????@end

????#import?"ManagerMessage.h"

????@implementation?ManagerMessage

????@synthesize?noteDelegate;

????//開始一個線程

????-(void)startThread

????{

????????[NSTimer?scheduledTimerWithTimeInterval:3

?????????????????????????????????????????target:self

???????????????????????????????????????selector:@selector(targetMethod:)

???????????????????????????????????????userInfo:nil

????????????????????????????????????????repeats:NO];

????}

????-(void)targetMethod:(NSString?*)string

????{

????????if?(self.noteDelegate!=nil)?{

????????????//完成線程?調用回調函數

????????????[self.noteDelegate?messageCallBack:@"回調函數"];

????????????}

????}

????@end

前臺頁面實現：

????#import?"IphoneDeleteViewController.h"

????#import?"ManagerMessage.h"

????@implementation?IphoneDeleteViewController

????@synthesize?textView;

????//回調函數

????-(void)messageCallBack:(NSString?*)string

????{

????????self.textView.text=string;

????}

????-?(void)viewDidLoad?{

????????[super?viewDidLoad];

????????self.textView.text=@"測試";

????????ManagerMessage?*message=[[ManagerMessage?alloc]?init];

????????//通知調用協議

????????message.noteDelegate=self;

????????[message?startThread];

????????[message?release];

????}

????-?(void)didReceiveMemoryWarning?{

????????[super?didReceiveMemoryWarning];

????}

????-?(void)viewDidUnload?{

????????self.textView=nil;

????}

????-?(void)dealloc?{

????????[self.textView?release];

????????[super?dealloc];

????}

????@end

總結

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