从 0,0 开始捕获屏幕截图

发布于 2024-10-29 21:00:33 字数 556 浏览 1 评论 0原文

我正在使用以下代码来制作屏幕截图

UIGraphicsBeginImageContext(self.view.frame.size);

blendMode:kCGBlendModeClear alpha:1.0];

[self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

return viewImage;

它工作正常，但它返回全屏，我想要特定框架的屏幕截图，例如 ( 100,100,200,200)，我尝试进行更改:

UIGraphicsBeginImageContext(self.view.frame.size);

但没有成功。

原文

I am using following code to make a screen shot

UIGraphicsBeginImageContext(self.view.frame.size);

blendMode:kCGBlendModeClear alpha:1.0];

[self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

return viewImage;

It is working fine but it returns the full screen, and I want a screen shot of a particular Frame, like ( 100,100,200,200), I tried to make changes in:

UIGraphicsBeginImageContext(self.view.frame.size);

But no success.

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独﹏钓一江月 2024-11-05 21:00:33

试试这个：

float x = 100;
float y = 100;
CGSize size = CGSizeMake(200,200);

UIGraphicsBeginImageContext(size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, -x, -y);
[view.layer renderInContext:c];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Try this:

float x = 100;
float y = 100;
CGSize size = CGSizeMake(200,200);

UIGraphicsBeginImageContext(size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, -x, -y);
[view.layer renderInContext:c];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

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没︽人懂的悲伤 2024-11-05 21:00:33

只需使用三行代码。

    UIGraphicsBeginImageContext(CGSizeMake(320, 480));
    [self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *frame= UIGraphicsGetImageFromCurrentImageContext();

just use three line of code.

    UIGraphicsBeginImageContext(CGSizeMake(320, 480));
    [self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *frame= UIGraphicsGetImageFromCurrentImageContext();

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~没有更多了~