Does anybody here know whether setNeedsDisplay results in an immediate drawRect call and immediate updatin开发者_运维知识库g of the screen?
In my application, I have a UIViewController with a subclassed UIView (and several other elements) inside of it. Inside of the UIView, called DrawView, in my drawRect: method, I draw a table grid type
I am using a window that uses a subclass of NSView.Part of it is drawn when the program starts, another part needs to be drawn when the user clicks on a button in another window.The code for the other
I\'m wondering whether I need to check if something is within the bounds of the CGRect passed to drawRect:, or if drawRect: automatically handles that for me.
My app allows the user to drag circles around on a screen. I\'m wondering whether there are any standard steps to take in order to implement this, especially in regards to marking the correct areas of
The app works fine with the iphone 开发者_开发问答simulator but when we run it in the actual iphone device it crashes at the following line:
I\'m doing a GPS tracking app. Every time it receives a Latitude/Longitude it converts it to (x,y) coordinates and calls drawRect to draw a line between two (x,y) pairs.
I\'m attempting to make guider/tip boxes for the iPhone as part of a tutorial framework i\'m making. I\'ve followed and combined two codes i\'ve found here:
I\'ve wrote this code... plotView is drawn programmatically by drawRect method... the problem is when I change the device orientation... all the views are not scaled properly... what\'s the matter wit
This is a very much daunting challenge I have ever faced. Im drawing lines when the finger is moved. The lines are created such that they bypass the imageviewspresnt in my drawingview. I`m using below
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