If you’re conforming to the UIWebViewDelegate protocol the webView:didFailLoadWithError: method gets triggered when there has been a problem. Call it like this and display an error message (in this case a UIAlertView): This method is also a good opportunity to stop any loading animations you’ve got going.
Here’s how you start it: UIApplication *application = [UIApplication sharedApplication]; application.networkActivityIndicatorVisible = YES; And this is how you stop it: UIApplication *application = [UIApplication sharedApplication]; application.networkActivityIndicatorVisible = YES; Comes in handy when displaying a UIWebView or performing any other activity that requires the user to “hang in there for a bit”. If you want to […]
Say you have a central array somewhere and would like display this in more detail via two table view controllers. Instead of passing only the relevant information, you want to pass the entire index path from table1 to table2 and beyond. You can pass data in the prepareForSegue:sender method and let the Storyboard to the […]
We can do this by setting properties of the UIButton for the states “normal” and “highlighted”. First we create pointers to the images, then we tell the button to use said images for each state: If the button has transparency enabled use the “custom” setting in your Storyboard. If the button should have a dynamic […]
It’s always good to have something happening while you’re loading a UIWebView. You can use the UIActivityIndicator for this. It’s basically an animated GIF file that you can connect to your code like many other elements. To make it work we need to conform to the UIWebViewDelegate protocol and then query our web view to […]
There’s a handy function called arrayWithArray that we can use: NSMutableArray *myNewArray = [[NSMutableArray alloc]init]; myNewArray = [NSMutableArray arrayWithArray:myOldArray]; Likewise we can convert a mutable array into a standard one: NSArray *myStandardArray = [[NSArray alloc]init]; myStandardArray = [NSArray arrayWithArray:myMutableArray];
You can set the title of a button depending on its control state. An unselected untoched button has a UIControlStateNormal, but Xcode will show you all the other options you have at your fingertips. To access this property you need to create an IBOutlet on the button. If you also want the button to trigger […]
I keep forgetting how to do this so here it is: if you have an integer and you want to print it out, say in a UILabel you can use the initWithFormat method of NSString like so: NSString *myNumber; myNumber = [[NSString alloc] initWithFormat:@”%d”, myInteger]; self.myLabel.text = myNumber; The secret here is the @”%d” which […]
