总结ios之逆向传值的方法
来源:爱站网时间:2019-02-11编辑:网友分享
在iOS开发中,有几种常见的逆向值传递方法,下面是爱站技术频道小编总结ios之逆向传值的方法,感兴趣的小伙伴们可以一起进入下文参考一下!
在iOS开发中,有几种常见的逆向值传递方法,下面是爱站技术频道小编总结ios之逆向传值的方法,感兴趣的小伙伴们可以一起进入下文参考一下!
第一种:代理传值
第二个控制器:
@protocol WJSecondViewControllerDelegate- (void)changeText:(NSString*)text; @end @property(nonatomic,assign)id 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]; }
以上就是总结ios之逆向传值的方法,更多内容请继续关注爱站技术频道其它相关文章!