将活动指示器添加到导航控制器栏

Posted 2021-02-26

This adds a spinning activity indicator to the top navigation bar of a navigation controller.

// stop activity indicator
	UINavigationController *tempNavigationController = [self.navigationController.viewControllers objectAtIndex:2];		
	CGRect frame = CGRectMake(0.0, 0.0, 25.0, 25.0);  	
	UIActivityIndicatorView *loading = [[UIActivityIndicatorView alloc] initWithFrame:frame];  	
	[loading sizeToFit];  	
	loading.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);  	
	UIBarButtonItem *statusInd = [[UIBarButtonItem alloc] initWithCustomView:loading];  		
	statusInd.style = UIBarButtonItemStylePlain;  	
	[tempNavigationController.navigationItem setRightBarButtonItem: statusInd animated:YES];