UIImage缩放

+(UIImage *)scaleImage: (UIImage *)image scaleFactor:(float)scaleFloat

{

    CGSize size = CGSizeMake(image.size.width * scaleFloat, image.size.height * scaleFloat);

    

    UIGraphicsBeginImageContext(size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGAffineTransform transform = CGAffineTransformIdentity;

    

    transform = CGAffineTransformScale(transform, scaleFloat, scaleFloat);

    CGContextConcatCTM(context, transform);

    

    // Draw the image into the transformed context and return the image

    [image drawAtPoint:CGPointMake(0.0f, 0.0f)];

    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return newimg;

}

转载于:https://www.cnblogs.com/cnman/p/5413223.html