@protocol WJSecondViewControllerDelegate <NSObject>
- (void)changeText:(NSString*)text;
@end
 @property(nonatomic,assign)id<WJSecondViewControllerDelegate>delegate;

- (IBAction)buttonClick:(UIButton*)sender {
_str = sender.titleLabel.text;
[self.delegate changeText:sender.titleLabel.text];
[self.navigationController popViewControllerAnimated:YES];
}

第一個(gè)控制器:

- (IBAction)pushToSecond:(id)sender {
WJSecondViewController *svc = [[WJSecondViewController alloc]initWithNibName:@"WJSecondViewController" bundle:nil];
svc.delegate = self;
svc.str = self.navigationItem.title;
[self.navigationController pushViewController:svc animated:YES];
[svc release];
}
- (void)changeText:(NSString *)text{
self.navigationItem.title = text;
}

第二種：通知傳值
第一個(gè)控制器：

 //注冊(cè)監(jiān)聽(tīng)通知
 [[NSNotificationCenter defaultCenter] addObserver:self     selector:@selector(limitDataForModel:) name:@"NOV" object:nil];
- (void)limitDataForModel:(NSNotification *)noti{
self.gamesInfoArray = noti.object;
}

第二個(gè)控制器：

//發(fā)送通知
 [[NSNotificationCenter defaultCenter]   postNotificationName:@"NOV" object:gameArray];

第三種：?jiǎn)卫齻髦?br /> Single是一個(gè)單例類，并且有一個(gè)字符串類型的屬性titleName
在第二個(gè)控制器：

- (IBAction)buttonClick:(UIButton*)sender {
Single *single = [Single sharedSingle];
single.titleName = sender.titleLabel.text;
[self.navigationController popViewControllerAnimated:YES];
}

第一個(gè)控制器：

- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
Single *single = [Single sharedSingle];
self.navigationItem.title = single.titleName;
}

第四種：block傳值
第二個(gè)控制器：

@property (nonatomic,copy) void (^changeText_block)(NSString*);
- (IBAction)buttonClick:(UIButton*)sender {
_str = sender.titleLabel.text;
self.changeText_block(sender.titleLabel.text);
[self.navigationController popViewControllerAnimated:YES];
}

第一個(gè)控制器：

- (IBAction)pushToSecond:(id)sender {
WJSecondViewController *svc = [[WJSecondViewController alloc]initWithNibName:@"WJSecondViewController" bundle:nil];
svc.str = self.navigationItem.title;
[svc setChangeText_block:^(NSString *str) {
  >self.navigationItem.title = str;
}]；
[self.navigationController pushViewController:svc animated:YES];
}

第五種：extern傳值
第二個(gè)控制器：

 extern NSString *btn;
- (IBAction)buttonClick:(UIButton*)sender {
btn = sender.titleLabel.text;
[self.navigationController popViewControllerAnimated:YES];
}

第一個(gè)控制器:

NSString *btn = nil;
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
self.navigationItem.title = btn;
}

第六種：KVO傳值
第一個(gè)控制器:

- (void)viewDidLoad {
[super viewDidLoad];
 _vc =[[SecondViewController alloc]init];
//self監(jiān)聽(tīng)vc里的textValue屬性
[_vc addObserver:self forKeyPath:@"textValue" options:0 context:nil];  
}

第二個(gè)控制器:

- (IBAction)buttonClicked:(id)sender {
self.textValue = self.textField.text;
[self.navigationController popViewControllerAnimated:YES];
}

其實(shí)還有很多種傳值方式，比如說(shuō)NSUserDefaults,先把數(shù)據(jù)保持在本地，再讀取，或者寫(xiě)入plist及其它類型的文件再讀取等等許多方式,在這里就不一一列舉了！這些代碼寫(xiě)的時(shí)間比較久了，今天整理了一下，還比較亂，有什么不對(duì)或不足的地方請(qǐng)見(jiàn)諒！

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