Objective c:在屏幕上绘制一个png(UIImageView内的UIImage)

发布于 2024-10-16 05:35:48 字数 1093 浏览 5 评论 0原文

我正在编写一个打砖块,并且正在创建一个类,它将在屏幕上绘制所有元素(球、砖块和桨)。

我试图将官方文档所采用的一些代码放在一起:

    -(id) drawWithGC: (CGContextRef) myContext andCGRect: (CGRect) myContextRect andPath: (const char *) filename
{
    CGImageRef image;
    CGDataProviderRef provider;
    CFStringRef path;
    CFURLRef url;

    path = CFStringCreateWithCString (NULL, filename, kCFStringEncodingUTF8);
    url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, NO);
    CFRelease(path);
    provider = CGDataProviderCreateWithURL (url);
    CFRelease (url);
    image = CGImageCreateWithPNGDataProvider (provider, NULL, true, kCGRenderingIntentDefault);
    CGDataProviderRelease (provider);
    CGContextDrawImage (myContext, myContextRect, image);
    CGImageRelease (image);

    UIImage *finalImage = [[UIImage alloc] imageWithCGImage:image];
    UIImageView *finalImageView = [[UIImage alloc] initWithImage:finalImage];

    return finalImageView;

}

我无法测试这个,因为我的其他课程尚未完成,但它“概念上”正确吗? 否则,您是否有一些示例可以测试将图像 UIImages 绘制到 UIImageView 中并检索,例如 center.x 和 center.y 位置?

谢谢

I'm writing a brickbreaker and I'm creating a class that will draw all elements (balls, bricks and paddle) on the screen.

I tried to put toghether some code taken by the official doc:

    -(id) drawWithGC: (CGContextRef) myContext andCGRect: (CGRect) myContextRect andPath: (const char *) filename
{
    CGImageRef image;
    CGDataProviderRef provider;
    CFStringRef path;
    CFURLRef url;

    path = CFStringCreateWithCString (NULL, filename, kCFStringEncodingUTF8);
    url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, NO);
    CFRelease(path);
    provider = CGDataProviderCreateWithURL (url);
    CFRelease (url);
    image = CGImageCreateWithPNGDataProvider (provider, NULL, true, kCGRenderingIntentDefault);
    CGDataProviderRelease (provider);
    CGContextDrawImage (myContext, myContextRect, image);
    CGImageRelease (image);

    UIImage *finalImage = [[UIImage alloc] imageWithCGImage:image];
    UIImageView *finalImageView = [[UIImage alloc] initWithImage:finalImage];

    return finalImageView;

}

I can't test this because my others class aren't finished but is it "conceptually" right?
Otherwise do you have some sample I can test to draw images UIImages into UIImageView et retrive, for example center.x and center.y position?

Thanks

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孤独难免 2024-10-23 05:35:48

几点:

  • 假设您在应用程序包中捆绑图像的图形,为什么不直接使用 [UIImage imagedName: @"Brick.png"] 来加载图像?
  • 您正在泄漏 UIImage 和 UIImageView,这表明您可能需要重新访问基本的内存管理文档。

A few points:

  • Assuming you are bundling graphics for your images within your app bundle, why not just use [UIImage imagedName: @"Brick.png"] to load images?
  • You are leaking a UIImage and UIImageView, which suggests you may need to revisit basic memory management documentation.
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