拼接图像时收到内存警告

Question

我正在开发一个应用程序，当用户从相机拍照时，我必须一个接一个地拼接多个图像。

这就是我用来合并两个图像的方法。

[self performSelector:@selector(joinImages:secondImage:) withObject:firstimage withObject:imageCaptured];
- (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    //Joins 2 UIImages together, stitching them horizontally
    CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
    UIGraphicsBeginImageContext(size);
    CGPoint image1Point = CGPointMake(0, 0);
    [im1 drawAtPoint:image1Point];
    CGPoint image2Point = CGPointMake(im1.size.width,0);
    [im2 drawAtPoint:image2Point];
    UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    firstimage=finalImage;// final images updated everytime
    [pool release];
    return finalImage;
}

但是当我在iPhone中运行它时，我会收到内存警告，它适用于iPod。

在iPhone的情况下，图像也被裁剪。

我能做的任何事情来解决这个问题。

谢谢。。

Answer 1

你可以做这样的事情。

 - (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
   {   
    @autoreleasepool
    {
       //Joins 2 UIImages together, stitching them horizontally
       CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
      UIGraphicsBeginImageContext(size);
      CGPoint image1Point = CGPointMake(0, 0);
      [im1 drawAtPoint:image1Point];
      CGPoint image2Point = CGPointMake(im1.size.width,0);
      [im2 drawAtPoint:image2Point];
      UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
      UIGraphicsEndImageContext();
      firstimage=finalImage;// final images updated everytime
      return finalImage;
   }   
 }

希望这对你有用。

Answer 2

 [self joinImages:firstimage secondImage:secondImage];
- (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
//Joins 2 UIImages together, stitching them horizontally
 CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
 UIGraphicsBeginImageContext(size);
 CGPoint image1Point = CGPointMake(0, 0);
 [im1 drawAtPoint:image1Point];
 CGPoint image2Point = CGPointMake(im1.size.width,0);
 [im2 drawAtPoint:image2Point];
 UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();
 firstimage=finalImage;// final images updated everytime
 [pool release];
 return finalImage;
 }