怎样从core graphics获取UIImage

bagusflyer — Mon, 06 Jul 2009 07:37:25 +0000

从core graphics获取UIImage的方法：

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- (void)viewDidLoad
{
[super viewDidLoad];

UIGraphicsBeginImageContext(CGSizeMake(20,20));
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextBeginPath(ctx);
CGContextAddArc(ctx, 10, 10, 10, 0, 2*M_PI, 1);
CGContextSetRGBFillColor(ctx, 1,0, 0, 1);
CGContextFillPath(ctx);
UIImage *redBall = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *redBallView = [[UIImageView alloc] initWithImage:redBall];
redBallView.center = CGPointMake(160,330);
[self.view addSubview:redBallView];
}

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怎样从core graphics获取UIImage