I have a drawing app in which I would like to create an undo method.The drawing takes place inside the TouchesMoved: method.
Ok I have searched all over and I can\'t not seem to find the answer I need. :-( Here is what I am doing and what I need to happen. I have a UIImageView that I am able to transfrom using UIPanGesture
How can I extract text from a PDF file using the iPhone SDK and Objective C? I have successfully read the PDF f开发者_高级运维ile, so does anyone have an idea how I can implement this functionality?
I have a subclass of UIView in which I\'ve added some subviews to in my initWithFrame method. I\'ve added a background, amongst other things.
Let\'s say I\'m writing text viewer for the iPhone using Core Text. Every time user changes base font size I need to count how many pages (fixed size CGRects) are needed to display the whole NSAttribu
I have a view in which I paint a dotted line when the user moves their finger across the screen of the iPad/iPhone. I draw the line between a point stored as LastLocation, and the point that is the Cu
I have a UIImageView within a UIScrollView which I have enabled the user to perform any number of flip and rotation operations on. I have this all working which allows the user to zoom, pan, flip and
I开发者_如何学C have a CGBitmapContext (bitmapContext) and I would like to draw some rectangle part (rect) of it to the current CGContext (context).
I am having some troubles using the CGContext with an iPhone app. I am trying to draw several lines with different colors, but all the lines always end up having the color 开发者_运维知识库which was u
I heard that a lot of people get a context error by not using drawRect Now I have this: - (void)drawRect:(CGRect)rect {
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