裁剪并重新创建UIImage

Question

我想在对它进行像素操作之前裁剪UIImage(不是imageview).在ios框架中有可靠的方法吗？

以下是我正在使用的android中的相关方法:

http://developer.android.com/reference/android/graphics/Bitmap.html#createBitmap(android.graphics.Bitmap,INT,INT,INT,INT) http://developer.android.com/reference/android/ graphics/Bitmap.html #createBitmap(int,int,android.graphics.Bitmap.Config)

Answer 1

-(UIImage*)scaleToSize:(CGSize)size image:(UIImage*)image
{
    UIGraphicsBeginImageContext(size);

    // Draw the scaled image in the current context
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    // Create a new image from current context
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    // Pop the current context from the stack
    UIGraphicsEndImageContext();

    // Return our new scaled image
    return scaledImage;
}