iphone – UIImage小中型大像苹果邮件

我们可以获得如下图像.

small = 320 pixels on longest edge JPEG
Medium = 640 pixels on longest edge JPEG
Large =  1296 pixels on longest edge JPEG

其中typeOfImage = 0,1,2分别为小型,中型和大型.

-(CGSizE)getImageWithRespectiveSize:(UIImage *)pImage withType:(NSInteger)typeOfImg
{
    CGSize pSize;
    if(typeOfImg == 0)
        pSize = [self getCGSizesOfImages:320 andImage:pImage];
    else if(typeOfImg == 1)
        pSize = [self getCGSizesOfImages:640 andImage:pImage];
    else if(typeOfImg == 2)
        pSize = [self getCGSizesOfImages:1296 andImage:pImage];
    else 
        pSize = CGSizeMake(pImage.size.width,pImage.size.height);

    return pSize;
}

-(CGSizE)getCGSizesOfImages:(NSInteger)pIntPixels andImage:(UIImage *)pImage
{
    CGSize pSize;
    if(pImage.size.width > pImage.size.height)
    {
        CGFloat tmp = pImage.size.height/pImage.size.width*pIntPixels;
        pSize = CGSizeMake(pIntPixels,tmp);
    }
    else if(pImage.size.width < pImage.size.height)
    {
        CGFloat tmp = pImage.size.width/pImage.size.height*pIntPixels;
        pSize =  CGSizeMake(tmp,pIntPixels);       
    }   
    else
    {
        CGFloat tmp = pImage.size.height/pImage.size.width*pIntPixels;
        pSize =  CGSizeMake(tmp,pIntPixels);       
    }
    return pSize;
}

并调用这样的功能

CGSize size = [self getImageWithRespectiveSize:imgOriginal withType:0];