ios - 在 ImageView 中旋转图像并保存到服务器

Question

我们如何在 ImageView 中旋转图像并在图像上应用手势并将该图像以与图像相同的状态保存到服务器

- (IBAction)imageMove:(id)sender {
    static int numRot = 0;

    myimage.transform = CGAffineTransformMakeRotation(M_PI_2 * numRot);
    ++numRot;
}

通过这段代码，我可以将 ImageView 旋转 90 度

Answer 1

使用这个:-

@interface UIImage (RotationMethods)
- (UIImage *)rotateImageByDegree:(CGFloat)degrees;
@end

@implementation UIImage (RotationMethods)

static CGFloat getRadianFromDegree(CGFloat degrees) 

{返回度 * M_PI/180;};

- (UIImage *) rotateImageByDegree:(CGFloat)degrees 
{   
    UIView *rotatedImageView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
    CGAffineTransform t = CGAffineTransformMakeRotation(getRadianFromDegree(degrees));
    rotatedImageView.transform = t;
    CGSize rotatedSize = rotatedImageView.frame.size;
    UIGraphicsBeginImageContext(rotatedSize);
    CGContextRef bitmap = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
    CGContextRotateCTM(bitmap, getRadianFromDegree(degrees));
    CGContextScaleCTM(bitmap, 1.0, -1.0);
    CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);
    UIImage *rotatedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return rotatedImage;

}

@end