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POUIView: Draw at double the size
 

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  1. POUIView: Draw at double the size
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    <p>I have a UIView with a dynamically generated graphic context. Its normal size is 100x100, but it can be scaled up to 200x200, so I want its size to be actually 200x200 in order to appear nicely and not blurred however it is displayed.</p> <p>How can always draw it 200x200 in drawRect, being it displayed at a size of 100 or at a size of 200? If I'm showing it at 100x100, the rect passed to drawRect is smaller than the area I need to draw into.</p> <p>My code:</p> <pre><code> - (void) drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); // prevent the drawings to be flipped CGContextTranslateCTM(ctx, 0, rect.size.height); CGContextScaleCTM(ctx, 1.0, -1.0); CGContextDrawImage(ctx, CGRectMake(0, 0, rect.size.width, rect.size.height), [UIImage imageNamed:@"actionBg.png"].CGImage); // generate the overlay if ([self isActive] == NO &amp;&amp; self.fullDelay != 0) { // TODO: remove fullDelay check! UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0); CGContextRef overlayCtx = UIGraphicsGetCurrentContext(); int segmentSize = (rect.size.height / [self fullDelay]); for (int i=0; i&lt;[self fullDelay]; i++) { float alpha = 0.9 - (([self fullDelay] * 0.1) - (i * 0.1)); [[UIColor colorWithRed:120.0/255.0 green:14.0/255.0 blue:14.0/255.0 alpha:alpha] setFill]; if (currentDelay &gt; i) { CGRect r = CGRectMake(0, i * segmentSize, rect.size.width, segmentSize); CGContextFillRect(overlayCtx, r); } [[UIColor colorWithRed:1 green:1 blue:1 alpha:0.3] setFill]; CGRect line = CGRectMake(0, (i * segmentSize) + segmentSize - 1 , rect.size.width, 1); CGContextFillRect(overlayCtx, line); } UIImage *overlay = UIGraphicsGetImageFromCurrentImageContext(); UIImage *overlayMasked = [TDUtilities maskImage:overlay withMask:[UIImage imageNamed:@"actionMask.png"]]; // prevent the drawings to be flipped CGContextTranslateCTM(ctx, 0, rect.size.height); CGContextScaleCTM(ctx, 1.0, -1.0); // put the overlay CGContextSetBlendMode(ctx, kCGBlendModeMultiply); CGContextDrawImage(ctx, rect, overlayMasked.CGImage); CGContextSetBlendMode(ctx, kCGBlendModeNormal); UIGraphicsEndImageContext(); } // prevent the drawings to be flipped CGContextTranslateCTM(ctx, 0, rect.size.height); CGContextScaleCTM(ctx, 1.0, -1.0); // draw the delay symbol CGContextDrawImage(ctx, rect, [UIImage imageNamed:@"delaySymbol.png"].CGImage); CGContextSetAlpha(ctx, 0.8); // draw the symbol NSString *imgName = [K_ACTION_IMAGES objectAtIndex:[self actionType]]; CGContextDrawImage(ctx, rect, [UIImage imageNamed:imgName].CGImage); CGContextSetAlpha(ctx, 1); // draw the delay number imgName = [NSString stringWithFormat:@"%d.png", [self fullDelay]]; CGContextDrawImage(ctx, rect, [UIImage imageNamed:imgName].CGImage); // draw the priority number imgName = [NSString stringWithFormat:@"%d.png", [self actionType]]; CGContextDrawImage(ctx, CGRectMake(32, 0, rect.size.width, rect.size.height), [UIImage imageNamed:imgName].CGImage); } </code></pre>
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    1. COHow are you scaling it up? Are you changing the `frame` or `bounds` of the view? Or are you setting the view's `transform`?
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    2. COI change the frame
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    3. COHave you tried setting the view's `contentMode` to `UIViewContentModeRedraw`? You can do it in code or in your xib. Does that give you the result you want?
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