无法正确调整图像大小

Question

我在 UIImage 调整大小时遇到问题，图像遮罩工作正常，但在应用遮罩后 UIImage 变硬，问题在于缩放，因为图像未正确缩放。

CCClippingNode *clippingNode = [[CCClippingNode alloc] initWithStencil:pMaskingFrame ];
pTobeMasked.scaleX = (float)pMaskingFrame.contentSize.width / (float)pTobeMasked.contentSize.width;
pTobeMasked.scaleY = (float)pMaskingFrame.contentSize.height / (float)pTobeMasked.contentSize.height;
clippingNode.alphaThreshold = 0;
[pContainerNode addChild:clippingNode];
pTobeMasked.position = ccp(pMaskingFrame.position.x, pMaskingFrame.position.y);
[clippingNode addChild:pTobeMasked];

Answer 1

我在我的一个项目中使用了以下功能来调整图像大小；

/*
     method parameters definition
     image : original image to be resized
     size  : new size
*/
+ (UIImage*)resizeImage:(UIImage *)image size:(CGSize)size
{
    UIGraphicsBeginImageContext(size);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    //here is the scaled image which has been changed to the size specified
    UIGraphicsEndImageContext();
    return newImage;
}

Answer 2

这会很有效。它类似于已发布的答案，但它有更多选项：

+(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
{
    //UIGraphicsBeginImageContext(newSize);
    // In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
    // Pass 1.0 to force exact pixel size.
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

无法正确调整图像大小

unable to resize image properly

objective-c

uiimage

cocos2d-iphone

ios