帮帮我,我是ios编程的新手,我想旋转我的UIImage,但是我不想边缘被剪裁或失去图像的一部分。
这是我的代码:
double angle = M_PI * 10/ 180; CGSize s = {image.size.width, image.size.height}; UIGraphicsBeginImageContext(s); CGContextRef ctx = UIGraphicsGetCurrentContext();
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformTranslate(transform, image.size.width/2, image.size.height/2);
transform = CGAffineTransformRotate(transform, angle);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGContextConcatCTM(ctx, transform);
CGContextDrawImage(ctx,CGRectMake(-[image size].width/2,-[image size].height/2,image.size.width, image.size.height),image.CGImage);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil);
图像在旋转,但框架的大小不会改变,因此一些图像已被剪切。
输出:https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/1555286_761679470521535_1800180000235265553_n.jpg 期望输出:https://fbcdn-photos-g-a.akamaihd.net/hphotos-ak-xfa1/t1.0-0/10314770_761675840521898_6536715783383115855_a.jpg 请帮忙检查,谢谢。