How iOS randomly jumps, push to pop

How can iOS casually jump, push to pop?

Theme ideas: such as a, B, C, D four view controller.

After a push B is wanted, B is on push to D, then from D Pop to C, in a from C pop

Here's how to fix it:

1. If at this time under a controller, want to push to B, you can write

[Self.navigationcontroller pushviewcontroller:b: YES]; At this time self.navigationController.viewControllers in order contains [a, b]

2. At this point to the B controller, the next is push to D, you can write

[Self.navigationcontroller pushviewcontroller:d: YES];

At this time self.navigationController.viewControllers in order to contain [a,b,d], next very important, how to think from D Pop to C, see array [a,b,d] There is no c how to pop to C?

You will need to modify this array to add C.

So you will write as follows:

[Self.navigationController.viewControllers ADDOBJECT:C];

Found an error, this is because Self.navigationController.viewControllers is an immutable group, there is no way, we had to change it:

Nsmutablearray*tempmarr =[nsmutablearrayarraywitharray:self.navigationcontroller.viewcontrollers];

At this time to add C is much easier, gee, smart you will find from D pop C can not directly addobject C directly;

Of course, I would do this:

2];

This time Tempmarr is like this [a,b,c,d], but in order to from C Pop to A, the array can not have B

You need to turn Tempmarr into [a,c,d], and as for how to change, you know more than I do,

Students who know how to think will find that the self.navigationController.viewControllers is still [a,b,d], do not worry, do not fear navigationcontroller have such a method, can be done, as follows:

[Self.navigationcontroller Setviewcontrollers:tempmarr Animated:yes];

Some students will say, this is not directly to replace B to C?

It looks like this, but jump timing, timing, timing important things to say three times, there are views of the switch, toggle, toggle ...

At this point in the B controller, these processes are processed in B, and must be B after the push to the D method, which means

[Self.navigationcontroller pushviewcontroller:d Animated:yes];

After the array processing;

Additional code:

Processing in the B controller:

-(void) pushtest {    [Self.navigationcontroller pushviewcontroller:d animated:yes];       Nsmutablearray*tempmarr = [NSMutableArrayarrayWithArray:self.navigationController.viewControllers];    [Tempmarr insertobject:c AtIndex:tempMarr.count 2 ];     // now self means b, because in B     [Self.navigationcontroller Setviewcontrollers:tempmarr animated:yes];}

How iOS randomly jumps, push to pop