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!

声明:本站所有文章,如无特殊说明或标注,均为本站原创发布。任何个人或组织,在未征得本站同意时,禁止复制、盗用、采集、发布本站内容到任何网站、书籍等各类媒体平台。如若本站内容侵犯了原著者的合法权益,可联系我们进行处理。