ios - 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 框架中是否有可靠的方法来执行此操作？

下面是我使用的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;
}