iOS的逆向传值有很多种方法，下面来总结几种常用的传值方式（只贴相关代码）:
第一种：代理传值
第二个控制器：
@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];}第一个控制器:
- (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;}第二种：通知传值
第一个控制器：
//注册监听通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(limitDataForModel:) name:@"NOV" object:nil];- (void)limitDataForModel:(NSNotification *)noti{self.gamesInfoArray = noti.object;}第二个控制器：
//发送通知 [[NSNotificationCenter defaultCenter] postNotificationName:@"NOV" object:gameArray];
第三种：单例传值
Single是一个单例类，并且有一个字符串类型的属性titleName
在第二个控制器：
- (IBAction)buttonClick:(UIButton*)sender {Single *single = [Single sharedSingle];single.titleName = sender.titleLabel.text;[self.navigationController popViewControllerAnimated:YES];}第一个控制器：
- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:animated];Single *single = [Single sharedSingle];self.navigationItem.title = single.titleName;}第四种：block传值
第二个控制器：
@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];}第一个控制器：
- (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];}第五种：extern传值
第二个控制器：
extern NSString *btn;- (IBAction)buttonClick:(UIButton*)sender {btn = sender.titleLabel.text;[self.navigationController popViewControllerAnimated:YES];}第一个控制器:
NSString *btn = nil;- (void)viewWillAppear:(BOOL)animated{[super viewWillAppear:animated];self.navigationItem.title = btn;}第六种：KVO传值
第一个控制器:
- (void)viewDidLoad {[super viewDidLoad]; _vc =[[SecondViewController alloc]init];//self监听vc里的textValue属性[_vc addObserver:self forKeyPath:@"textValue" options:0 context:nil]; }第二个控制器:
- (IBAction)buttonClicked:(id)sender {self.textValue = self.textField.text;[self.navigationController popViewControllerAnimated:YES];}其实还有很多种传值方式，比如说NSUserDefaults,先把数据保持在本地，再读取，或者写入plist及其它类型的文件再读取等等许多方式,在这里就不一一列举了！这些代码写的时间比较久了，今天整理了一下，还比较乱，有什么不对或不足的地方请见谅！
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