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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):

2016-03-24 11:38 1206 查看



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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