Common UIAcitivityIndicator for all view controllers - iphone

Question

I have multiple view controllers in my application.
While downloading data from server, I can start a UIActivityIndicatorView.
But the problem is for three different view controllers I need to create three different UIActivityIndicatorView.
I want to initialize UIActivityIndicatorView only once in some place so I can display or hide it. No need to create or initialize UIActivityIndicatorView as many as view controllers.
How can I do this? Any help.

Answer 1

Add your loading indicator on window in your appdelgate like this
First initialize your loading view
-(void)InitializeLoadingIndictor
{
loadingView = [[UIImageView alloc]initWithFrame:CGRectMake(300, 400, 150, 150)];
[loadingView setBackgroundColor:[UIColor blackColor]];
[loadingView setAlpha:0.6];
[loadingView setHidden:YES];
[loadingView.layer setCornerRadius:10];
[_window addSubview:loadingView];
loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
[loadingIndicator setFrame:CGRectMake(50, 50, 50, 50)];
[loadingView addSubview:loadingIndicator];
}
Then create two methods two hide and show it
+ (void)showLoading
{
[loadingView setHidden:NO];
[loadingIndicator startAnimating];
}
Hide it
+ (void)hideLoading
{
[loadingView setHidden:YES];
}
Then in your view controller, call it as
[AppDelegate showLoading];
And to hide it when your are done
[AppDelegate hideLoading];

Answer 2

You can use a custom UIAlertView to show your indicator.
I have made two custom files using which you can show indicator without initializing it again and again.
files are:
//header file..
#import <UIKit/UIKit.h>
#interface ProgressIndicator : UIAlertView
{
UIActivityIndicatorView *activityIndicator;
}
#end
//implementation file
#import "ProgressIndicator.h"
#implementation ProgressIndicator
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
activityIndicator=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
// Initialization code
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
[self addSubview:activityIndicator];
[activityIndicator startAnimating];
// Drawing code
}
#end
//using this files in your controller..
#import "ProgressIndicator.h"
ProgressIndicator *progressIndicator=[[ProgressIndicator alloc] initWithTitle:#"Loading" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
[progressIndicator show];

Answer 3

Please refer this https://github.com/jdg/MBProgressHUD link. You will get custom Activity indicator for all the views.

Answer 4

Thanks guys for the answers. Below code works for me.
AppDelegate.m
-(void)StartLoading
{
loader = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
loader.frame = CGRectMake(50, 14, 20, 20);
[loader startAnimating];
[self.window addSubview:loader];
[self.window bringSubviewToFront:loader];
}
-(void)EndLoading
{
for(UIView *subview in [self.window subviews])
{
if(subview==loader)
[subview removeFromSuperview];
}
}