objective-c - What does the CGRectApplyAffineTransform function in CoreGraphics do?
1 2 3 4 5 | <code class = "objc" >CGRect rect = CGRectMake(0, 0, 300, 200);
rect = CGRectApplyAffineTransform(rect,
CGAffineTransformMakeScale(1, -1));
cgPath = CGPathCreateWithRect(rect, NULL);</code>
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What does this code mean?