将图像发送到照片库的ipad应用程序不捕获背景

时间:2012-03-30 16:08:15

标签: xcode ios5 cgcontext

我有一个允许用各种背景颜色书写的应用程序。当我调用该方法捕获写入照片库的方法时,我得到了写作但没有任何背景颜色。

我可以帮助找出原因..

我用以下方法简单地绘制背景颜色:

drawImage.backgroundColor = [UIColor someColor];

drawImage定义为UIImageView

我写给drawImage ok:

UIGraphicsBeginImageContext(self.view.frame.size);
    [drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), brush);
    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
    CGContextBeginPath(UIGraphicsGetCurrentContext());
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
    CGContextStrokePath(UIGraphicsGetCurrentContext());
    drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
    savedImage.image = drawImage.image;
    UIGraphicsEndImageContext();

写入照片库是这样的:

UIImageWriteToSavedPhotosAlbum(drawImage.image, self, nil, nil);

我很感激任何建议。

由于

1 个答案:

答案 0 :(得分:0)

我得到了Apple Dev的帮助。论坛,所以我想我会在这里发帖帮助其他人(以及更多评论):

CGImageRef UIGetScreenImage(void);

然后

-(void)captureToPhotoAlbum {
    NSLog(@"%s", __FUNCTION__); 
    // Get image to save
    CGImageRef screen = UIGetScreenImage();
    UIImage *img = [UIImage imageWithCGImage:screen];

    // Image cropping
    CGImageRef imageRef = CGImageCreateWithImageInRect([img CGImage], CGRectMake(0.0f, 70.0f, 768.0f, 768.0f));
    UIImage *img2Save = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);

    // Request to save the image to camera roll
    UIImageWriteToSavedPhotosAlbum(img2Save, self, nil, nil);

}