iOS Activity Indicator - ios

Question

I trying to create activity indicator, currentView will be static and nextView will animate left to right, right to left, top to bottom and bottom to top.
I had written the code as below. The problem I am facing is, instead of all the four animations I am getting only one animation top to bottom animation. Can anyone help me how to run all the four animations one by one until a process is completed
statusImage = [UIImage imageNamed:#"image2.png"];
moveImage = [UIImage imageNamed:#"image1.png"];
currentView = [[UIImageView alloc]
initWithImage:statusImage];
nextView = [[UIImageView alloc]
initWithImage:moveImage];
//Add your custom activity indicator to your current view
[self.view addSubview:currentView];
[self.view addSubview:nextView];
CATransition *transition1 = [CATransition animation];
[transition1 setType:kCATransitionPush];
[transition1 setSubtype:kCATransitionFromLeft];
[transition1 setDuration:1];
[nextView.layer addAnimation:transition1 forKey:#"string1"];
CATransition *transition2 = [CATransition animation];
[transition2 setType:kCATransitionPush];
[transition2 setSubtype:kCATransitionFromRight];
[transition2 setDuration:1];
[nextView.layer addAnimation:transition2 forKey:#"string2"];
CATransition *transition3 = [CATransition animation];
[transition3 setType:kCATransitionPush];
[transition3 setSubtype:kCATransitionFromTop];
[transition3 setDuration:1];
[nextView.layer addAnimation:transition3 forKey:#"string3"];
CATransition *transition4 = [CATransition animation];
[transition4 setType:kCATransitionPush];
[transition4 setSubtype:kCATransitionFromBottom];
[transition4 setDuration:1];
[nextView.layer addAnimation:transition4 forKey:#"string4"];

Answer 1

Can anyone help me how to run all the four animations one by one until a process is completed
A layer can have only one transition animation at a time. There is no point supplying a key for a transition animation. The key will always really be kCATransition. Your string1 etc. are pointless; just use nil. Moreover, your code makes no sense; multiple animations attached to a layer causes those animations to be performed simultaneously (if possible), not successively.
You need to chain the animations. Set up your code like this:
Perform the first animation, giving it a completion handler. This completion handler is called when the first animation finishes.
In the completion handler, do the second animation, giving it a completion handler. This completion handler is called when the second animation finishes.
In the completion handler, do the third animation, giving it a completion handler. This completion handler is called when the third animation finishes.
In the completion handler, do the fourth animation.