cgcontext

I'm drawing multiple 'pages' of imagery using a CGContext in the iOS. I've used sizeWithFont and drawInRect combinations extensively in my app. What I need to do is split a large chunk of text across multiple pages. I can size it and work out whether or not it needs another page but how do I know where to chop it? Do I have to do an ugly loop to check word by word until I find a string length that perfectly fits the page and then chop the string at that point? Is there a smarter way? Any ideas? Thanks. The NSString additions to UIKit for drawing text, you can pre-determine the exact amount of

I try to make a 20x20 UIImage with a simple blue circle. I try with this function, but the result is a blue circle in a black square. How do I remove the black square around the circle? Function: + (UIImage *)blueCircle { static UIImage *blueCircle = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ UIGraphicsBeginImageContextWithOptions(CGSizeMake(20.f, 20.f), YES, 0.0f); CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextSaveGState(ctx); CGRect rect = CGRectMake(0, 0, 20, 20); CGContextSetFillColorWithColor(ctx, [UIColor cyanColor].CGColor);

I have a UISearchBar inside a view, whenever I tap on it, after the keyboard comes up - after -(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar it sends this to the console: <Error>: CGContextSetStrokeColorWithColor : invalid context 0x0 . This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. It repeats the same error. I am wonderring what exactly could

I have an image with a yellow vase in the foreground and transparent background: I'm drawing it on a CGContext: CGContextDrawImage(context, CGRectMake(0, 0, 100, 100), myImage.CGImage); I can draw a shadow around it by using the following statement before CGContextDrawImage : CGContextSetShadowWithColor(context, CGSizeMake(0,0), 5, [UIColor blueColor].CGColor); But I want to put a stroke around the image, so that it'll looks like following: If I did this: CGContextSetRGBStrokeColor(shadowContext, 0.0f, 0.0f, 1.0f, 1.0f); CGContextSetLineWidth(shadowContext, 5); CGContextStrokeRect