使用图像文件的一部分创建UIImageView [英] create UIImageView with portion of image file
问题描述
我正在继承 UIImageView
来创建基于图块的应用程序。基本上,我正在拍摄单个图像文件并将其分解为多个部分,然后将这些部分分配给我的图块( UIImageViews
),以便可以单独操作它们。 / p>
获取图像的一部分并使用它来绘制 UIImageView
的最佳方法是什么?我考虑重写 drawRect
并使用 CGAffineTransform
,但似乎应该有一种更简单的方法来做到这一点,也许通过指定一个 CGRect
到 UIImage
传递给 UIImageView
,但我没有看到这个API。
我们走了:
UIImage * img = [UIImage imageNamed:@myImage.jpg];
CGRect imgFrame = CGRectMake(x,y,tileWidth,tileHeight);
CGImageRef imageRef = CGImageCreateWithImageInRect([img CGImage],imgFrame);
UIImage * subImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
I'm subclassing UIImageView
to create a tile-based application. Essentially, I am taking a single image file and breaking it up into pieces, and then assigning the pieces to my tiles (UIImageViews
), so that they can be manipulated independently.
What's the best way to grab a portion of an image and use that to draw a UIImageView
? I thought about overriding drawRect
and using CGAffineTransform
, but it seems like there ought to be a simpler way to do this, perhaps by specifying a CGRect
to the UIImage
that is passed to the UIImageView
, but I don't see an API for this.
Here we go:
UIImage* img = [UIImage imageNamed:@"myImage.jpg"];
CGRect imgFrame = CGRectMake(x, y, tileWidth, tileHeight);
CGImageRef imageRef = CGImageCreateWithImageInRect([img CGImage], imgFrame);
UIImage* subImage = [UIImage imageWithCGImage: imageRef];
CGImageRelease(imageRef);
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