我正在尝试用“遮罩图像”遮罩图像。它第一次工作得很好。但是,当我在应用程序中使用相同的蒙版图像再尝试一次时,应用程序崩溃了。尝试使用另一个蒙版图像时,它可以正常工作。为什么会这样?
控制台显示<Error>: CGImageMaskCreate: invalid mask bits/component: 4294967295.
- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {
CGImageRef maskRef = maskImage.CGImage;
CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
CGImageGetHeight(maskRef),
CGImageGetBitsPerComponent(maskRef),
CGImageGetBitsPerPixel(maskRef),
CGImageGetBytesPerRow(maskRef),
CGImageGetDataProvider(maskRef), NULL, false);
CGImageRef masked = CGImageCreateWithMask([image CGImage], mask);
UIImage *img2=[UIImage imageWithCGImage:masked];
CGImageRelease(maskRef);
CGImageRelease(mask);
CGImageRelease(masked);
return img2;
}
fun1()
{
view.image=[self maskImage:image1 withMask:[UIImage imageNamed:@"image2.png"]];
}
fun2()
{
view.image=[self maskImage:image1 withMask:[UIImage imageNamed:@"image2.png"]]; view.image=[self maskImage:image1 withMask:[UIImage imageNamed:@"image3.png"]];
}
fun3()
{
view.image=[self maskImage:image1 withMask:[UIImage imageNamed:@"image2.png"]];
view.image=[self maskImage:image1 withMask:[UIImage imageNamed:@"image2.png"]];
}
调用fun1
and时fun2
,应用程序工作正常。调用时应用程序崩溃fun3
。