ios - 如何在ios应用程序中合并两个半图像？

Question

我制作了一个相机应用程序，在其中单击图像并将其切成两半，然后单击另一张图像并从中切出另一半。
然后将这两个图像合并，我已经成功完成了这个任务，但问题是合并不顺利。

两半之间有明显的分隔....我想知道如何平滑它？

//------merging the two images------
- (UIImage*)mergeImage:(UIImage*)first withImage:(UIImage*)second
{
    // get size of the first image
    CGImageRef firstImageRef = first.CGImage;
    CGFloat firstWidth = CGImageGetWidth(firstImageRef);
    CGFloat firstHeight = CGImageGetHeight(firstImageRef);
    
    // get size of the second image
    CGImageRef secondImageRef = second.CGImage;
    CGFloat secondWidth = CGImageGetWidth(secondImageRef);
    CGFloat secondHeight = CGImageGetHeight(secondImageRef);
    
    // build merged size
    CGSize mergedSize = CGSizeMake((firstWidth+secondWidth), MAX(firstHeight, secondHeight));
    
    // capture image context ref
    UIGraphicsBeginImageContext(mergedSize);
    
    //Draw images onto the context
    [first drawInRect:CGRectMake(0, 0, firstWidth, firstHeight)];
    //[second drawInRect:CGRectMake(firstWidth, 0, secondWidth, secondHeight)];
    [second drawInRect:CGRectMake(firstWidth, 0, secondWidth, secondHeight) blendMode:kCGBlendModeNormal alpha:1.0];
    
    // assign context to new UIImage
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    // end context
    UIGraphicsEndImageContext();
    
    return newImage;
   
}

谢谢

（我接受downvote作为健康的批评，但请gv rsn以便我可以改进）

Answer 1

如果我没有错，那么你想要这个。

UIImageView *imgView1, *imgView2, *imgView3;
imgView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image1"]];
imgView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image2"]];
imgView3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image3"]];
imgView1.frame = CGRectMake(0, 0, 50, 50);
imgView2.frame = CGRectMake(50, 50, 100, 100);
imgView3.frame = CGRectMake(100, 100, 200, 200);
[referenceView addSubview:imgView1];
[referenceView addSubview:imgView2];
[referenceView addSubview:imgView3];
UIGraphicsBeginImageContext(referenceView.bounds.size);
[referenceView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
resultView = [[UIImageView alloc] initWithImage:finalImage];
resultView.frame = CGRectMake(0, 0, 320, 480);
[self.view addSubview:resultView];
referenceView.hidden = YES;

Answer 2

UIImageView *referenceView = [[UIImageView alloc]init];
referenceView.frame = CGRectMake(0, 0, 1024, 768);
referenceView.hidden = NO;

[self.view insertSubview:referenceView belowSubview:selfView];

UIImageView *imgView1, *imgView2,*imgView3;
imgView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image1"]];
imgView2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image2"]];
imgView3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image3"]];


imgView1.frame = CGRectMake(0, 0, 50, 50);
imgView2.frame = CGRectMake(50, 50, 100, 100);
imgView3.frame = CGRectMake(100, 100, 200, 200);

[referenceView addSubview:imgView1];
[referenceView addSubview:imgView2];
[referenceView addSubview:imgView3];
UIImage *finalImage = nil;
UIGraphicsBeginImageContext(referenceView.bounds.size);
[referenceView.layer renderInContext:UIGraphicsGetCurrentContext()];
finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return finalImage;