iOS的逆向傳值有很多種方法，下面來總結幾種常用的傳值方式（只貼相關代碼）:
第一種：代理傳值
第二個控制器：
@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
第一個控制器：
//注冊監聽通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(limitDataForModel:) name:@"NOV" object:nil];- (void)limitDataForModel:(NSNotification *)noti{self.gamesInfoArray = noti.object;}第二個控制器：
//發送通知 [[NSNotificationCenter defaultCenter] postNotificationName:@"NOV" object:gameArray];
第三種：單例傳值
Single是一個單例類，并且有一個字符串類型的屬性titleName
在第二個控制器：
- (IBAction)buttonClick:(UIButton*)sender {Single *single = [Single sharedSingle];single.titleName = sender.titleLabel.text;[self.navigationController popViewControllerAnimated:YES];}第一個控制器：
- (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
第二個控制器：
extern NSString *btn;- (IBAction)buttonClick:(UIButton*)sender {btn = sender.titleLabel.text;[self.navigationController popViewControllerAnimated:YES];}第一個控制器:
NSString *btn = nil;- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:animated];self.navigationItem.title = btn;}第六種：KVO傳值
第一個控制器:
- (void)viewDidLoad {[super viewDidLoad]; _vc =[[SecondViewController alloc]init];//self監聽vc里的textValue屬性[_vc addObserver:self forKeyPath:@"textValue" options:0 context:nil]; }第二個控制器:
- (IBAction)buttonClicked:(id)sender {self.textValue = self.textField.text;[self.navigationController popViewControllerAnimated:YES];}其實還有很多種傳值方式，比如說NSUserDefaults,先把數據保持在本地，再讀取，或者寫入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！這些代碼寫的時間比較久了，今天整理了一下，還比較亂，有什么不對或不足的地方請見諒！
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