向UIImage添加图像边框

Posted 2021-02-26

Adds a fine border to a UIImage.

- (UIImage*)imageWithBorderFromImage:(UIImage*)source;
{
	CGSize size = [source size];
	UIGraphicsBeginImageContext(size);
	CGRect rect = CGRectMake(0, 0, size.width, size.height);
	[source drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];
 
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGContextSetRGBStrokeColor(context, 1.0, 0.5, 1.0, 1.0); 
	CGContextStrokeRect(context, rect);
	UIImage *testImg =  UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	return testImg;
}