Access UIView Methods from Controller / Add UIImage

Question

In the ViewController I would like to:

1) Detect if the UIView has been selected
2) Insert an image at the coordinates.

How do I do this? I'm currently using:

CGPoint touchPoint = [touch locationInView:theViewIWant];
UIImage *myImage = [UIImage imageNamed:@"myimage.jpg"];
[myImage drawAtPoint:touchPoint];

But this isn't working.

Justin Spahr-Summers · Accepted Answer · 2010-12-05 20:47:07Z

1

The most straightforward way to do what you want is to create a UIImageView which you insert or remove as a subview when appropriate.

However, why go to all that trouble when UIButton already provides this functionality? Just create a button of type UIButtonTypeCustom and set a background image only for the "highlighted" state.

answered Dec 5, 2010 at 20:47

Justin Spahr-Summers

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5 Comments

confused Over a year ago

How do I call a method in the view from the controller? I'm finding it quite hard understanding what to do - it's quite difficult coming from a Java background.

Justin Spahr-Summers Over a year ago

For a button, you really just need to do something like [button setBackgroundImage:myImage forControlState:UIControlStateHighlighted] when you initialize it. The button itself will then automatically handle touch events and highlight appropriately. If you need a method to be called when the user taps the button, you can use addTarget:action:forControlEvents:: developer.apple.com/library/ios/documentation/UIKit/Reference/…

confused Over a year ago

Thanks a lot for that. If I could bother you with just another quick question: How do I create an array that is going to be edited by the controller but the view needs access to it?

Justin Spahr-Summers Over a year ago

That's a complex enough question that you might want to open up a new thread. Without knowing any specifics, one answer is probably that the view shouldn't have access to it, but should use delegation to get the data it needs.

confused Over a year ago

Thanks for your help. In case you want a go at that question: stackoverflow.com/questions/4361989/…

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