Question

我正在尝试使图像的角落变圆，但ImageContext中的图像会失真。

这是我正在采取的步骤：

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodedData
{
    NSURL *url = [NSURL URLWithString:strEncodedData];
    NSData* data = [[NSData alloc] initWithContentsOfURL:url];
    UIImage* image = [[UIImage alloc] initWithData:data];
    UIImage* croppedImage = [self makeRoundedImage:image];
    return croppedImage;
}

- (UIImage *)makeRoundedImage:(UIImage *) image
{

    CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);

    UIGraphicsBeginImageContext(frame.size);
    //[[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, image.size.width, image.size.height) cornerRadius:10.0] addClip];
    [image drawInRect:frame];

    // Get the image
    UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();

    // Lets forget about that we were drawing
    UIGraphicsEndImageContext();

    return croppedImage;
}

Answer 1

试试这个。

-(UIImage *)imageWithRoundedCorner:(float)cornerRadius Image:(UIImage *)realImage
{
    UIImageView *imageView = [[UIImageView alloc] initWithImage:realImage];
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 1.0);
    [[UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:cornerRadius] addClip];
    [realImage drawInRect:imageView.bounds];
    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return imageView.image;
}

Answer 2

您可以查看此方法

-(UIImage *)roundedImage:(UIImage *) roundImage 
                      radius: (float) radius;
{
  CALayer *imageLayer = [CALayer layer];
  imageLayer.frame = CGRectMake(0, 0, roundImage.size.width, roundImage.size.height);
  imageLayer.contents = (id) roundImage.CGImage;

  imageLayer.masksToBounds = YES;
  imageLayer.cornerRadius = radius;

  UIGraphicsBeginImageContext(roundImage.size);
  [imageLayer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *finalRoundedImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  return finalRoundedImage;
}

Answer 3

试试这个。它会解决图像失真的问题。

- (UIImage *)makeRoundedImage:(UIImage *) image
{

    CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);

UIGraphicsBeginImageContextWithOptions(frame.size, NO, 0);
    //[[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, image.size.width, image.size.height) cornerRadius:10.0] addClip];
    [image drawInRect:frame];

    // Get the image
    UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();

    // Lets forget about that we were drawing
    UIGraphicsEndImageContext();

    return croppedImage;
}

ImageContext返回图像失真

3 个答案: