如何在带有Tab Bar Controller的View Controller之间传输浮点值？

Question

I have 1 original tab, tab A, which contains a button to segue to a second ViewController (B). In VC B, a number is selected and changes a label in Tab A to say that number (All of that works perfectly).

I have a method that makes a new tab, and I need to know how to get the float value from Tab A and VC B to be recognized as the same value in Tab C (the new tab). Any help is appreciated!

Edit: Here is the method I have to make a new tab

    -(void)makeNewTab: (NSString *)linkToSnipe {

NSMutableArray* tabs = [[NSMutableArray alloc] init];
[tabs addObjectsFromArray:self.tabBarController.viewControllers];
NewLinkViewController* newVC = [self.storyboard instantiateViewControllerWithIdentifier:@"Link"];
[tabs addObject: newVC];
UITabBarItem* item = [[UITabBarItem alloc] init];
NSString* itemTitle = [NSString stringWithFormat:@"Link # %lu", (unsigned long)[itemsAlreadyAddedToCart count]];
[item setTitle: itemTitle];
[item setImage:[UIImage imageNamed:@"shoe.png"]];
[newVC setTabBarItem:item];
[self.tabBarController setViewControllers: [NSArray arrayWithArray:tabs]];
int indexOfNewTab = [tabs count]-1;
[newVC setLinkToSnipe:linkToSnipe];
[newVC setSizeIWant: sizeChosen];
self.tabBarController.selectedIndex = indexOfNewTab;

}

setLinkToSnipe:linktosnipe works perfectly, that string is known as the same thing in the new tab. setSizeIWant: sizeChosen does not work. Size chosen is the float value I need in tab C

Answer 1

如果不看代码，除了以与现在在选项卡A和B之间进行操作相同的方式进行操作外，很难提出建议。创建选项卡C时，为其提供一个属性，该属性可以由创建它的任何人来设置。

Answer 2

you have to have a float value in tab C :

@property (nonatomic) float floatValue;

and change it by adding the following at the end of tab B and tab A:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.identifier isEqualToString:@"segue"]){
        ViewCont *vc = segue.destinationViewController;
        vc.floatValue = value;
    }

}