Question

我遇到UIImage调整大小的问题，图像蒙版工作正常但是应用蒙版UIImage后，问题是缩放，因为图像没有正确缩放。

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

我的一个项目我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

这将像一个魅力。它与已发布的答案类似，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

2 个答案: