drawrect

I have a UITableViewCell subclass that does its drawing in a drawRect: method. The whole rectangle is custom drawn, including the background. I was able to get very complex cells while keeping the scrolling very smooth. My problem: I call [table deselectRowAtIndexPath:path animated:YES]; whenever the view appears, in order to comply with Apple's HIG. However, no animation occurs. It worked when I had a custom view (created with subviews) that was transparent (so Apple's background would appear below), of course. Now it doesn't. My drawRect: is called once during the "animation time", about

Hi I am trying to draw strings in my UITableViewCell in iOS 7 with the following code -(void)drawRect:(CGRect)rect{ [super drawRect:rect]; CGRect playerNameRect = CGRectMake(0, kCellY, kPlayerNameSpace, kCellHeight); NSDictionary*dictonary = [NSDictionary dictionaryWithObjectsAndKeys: [UIColor hmDarkGreyColor], NSForegroundColorAttributeName, kFont, NSFontAttributeName, nil]; [self.playerName drawInRect:playerNameRect withAttributes:dictonary]; } However I can not get anything to appear... self.playerName is not nil, and the playerNameRect is correct. I was previously using the following code

I don't really understand how CALayer's display and drawInContext relate to drawRect in the view. If I have an NSTimer that sets the [self.view setNeedsDisplay] every 1 second, then drawRect is called every 1 second, as shown by an NSLog statement inside of drawRect . But if I subclass a CALayer and use that for the view, if I make the display method empty, then now drawRect is never called. Update: But display is called every 1 second, as shown by an NSLog statement. If I remove that empty display method and add an empty drawInContext method, again, drawRect is never called. Update: But

So I've got a basic drawing app in the process that allows me to draw lines. I draw to an off screen bitmap then present the image in drawRect . It works but its way too slow, updating about half a second after you've drawn it with your finger. I took the code and adapted it from this tutorial, http://www.youtube.com/watch?v=UfWeMIL-Nu8&feature=relmfu , as you can see in the comments people are also saying its too slow but the guy hasn't responded. So how can I speed it up? or is there a better way to do it? any pointers will be appreciated. Heres the code in my DrawView.m . -(id)initWithCoder

I am subclassing my UIView class. The Xcode (I am using 4.6.3) auto generated code says, /* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { // Drawing code } */ It raised few questions in my mind : 1) Why an empty implementation of drawRect: will cause adverse performance during animation. 2) When should I implement drawRect: . 3) If I am implementing drawRect: then what should be taken as precaution for the best practice. To know when to use -drawRect: and when to do things

I have been doing some experimenting with iOS drawing. To do a practical exercise I wrote a BarChart component. The following is the class diagram (well, I wasnt allowed to upload images) so let me write it in words. I have a NGBarChartView which inherits from UIView has 2 protocols NGBarChartViewDataSource and NGBarChartViewDelegate. And the code is at https://github.com/mraghuram/NELGPieChart/blob/master/NELGPieChart/NGBarChartView.m To draw the barChart, I have created each barChart as a different CAShapeLayer. The reason I did this is two fold, first I could just create a UIBezierPath and

Basically I need to have a circle with stroke in different color, all equal in size. For example, 1/2 is blue and 1/2 is red. Image (sorry for so bad image): How can I draw something like this? There are lots of ways to do it, but one is to just draw two bezier paths, one for each side: - (void)drawRect:(CGRect)rect { UIBezierPath *blueHalf = [UIBezierPath bezierPath]; [blueHalf addArcWithCenter:CGPointMake(100, 100) radius:90.0 startAngle:-M_PI_2 endAngle:M_PI_2 clockwise:YES]; [blueHalf setLineWidth:4.0]; [[UIColor blueColor] setStroke]; [blueHalf stroke]; UIBezierPath *redHalf =