Tag Archives: CALayer

Capture view contents into an UIImage object

by on February 23, 2010 in Cocoa touch

By combining UIGraphicsBeginImageContext() and -renderInContext in CALayer, you can draw contents into a image (UIImage) object. It is like screen capture.

UIGraphicsBeginImageContext(view.frame.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
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Set border around the view

by on February 23, 2010 in Cocoa touch

There is no border property in UIView…. classes but we can access CALayer class to set border. Since layer property is defined in the UIView class, all of UIView inherited class can use this property to set border. It needs to have #import <QuartzCore/QuartzCore.h> to access CALayer.

view.layer.borderWidth = 1;
view.layer.borderColor = [[UIColor grayColor] CGColor];
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