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
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@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]; } |
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- (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
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//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; } |
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//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
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- (IBAction)buttonClick:(UIButton*)sender { Single *single = [Single sharedSingle]; single.titleName = sender.titleLabel.text; [self.navigationController popViewControllerAnimated:YES]; } |
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- ( void )viewWillAppear:( BOOL )animated{ [super viewWillAppear:animated]; Single *single = [Single sharedSingle]; self.navigationItem.title = single.titleName; } |
第四种:block传值
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@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]; } |
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- (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
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extern NSString *btn; - (IBAction)buttonClick:(UIButton*)sender { btn = sender.titleLabel.text; [self.navigationController popViewControllerAnimated:YES]; } |
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NSString *btn = nil; - ( void )viewWillAppear:( BOOL )animated{ [super viewWillAppear:animated]; self.navigationItem.title = btn; } |
第六种:KVO传值
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- ( 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]; } |
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- (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!