ios - 将两个图像混合在一起

Question

我正在尝试将两张图片合并成最终图片，但不幸的是我找不到这样做的方法。如何合并如下所示的两张照片？

Answer 1

UIImage *image1 = [UIImage imageNamed:@"image1.jpg"];
UIImage *image2 = [UIImage imageNamed:@"image2.jpg"];

CGSize newSize = image1.size; //set new size as you want
UIGraphicsBeginImageContext( newSize );

//crop image1
CGImageRef imageRef = CGImageCreateWithImageInRect([image1 CGImage], CGRectMake(0, 0, image1.size.width/2, image1.size.height));
image1 = [UIImage imageWithCGImage:imageRef scale:image1.scale orientation:image1.imageOrientation];
CGImageRelease(imageRef);


//crop image2
imageRef = CGImageCreateWithImageInRect([image2 CGImage], CGRectMake(0, 0, image2.size.width/2, image2.size.height));
image2 = [UIImage imageWithCGImage:imageRef scale:image2.scale orientation:image2.imageOrientation];
CGImageRelease(imageRef);

//combine both images
// Use existing opacity as is
[image1 drawInRect:CGRectMake(0, 0, newSize.width/2, newSize.height)];

// Apply supplied opacity if applicable
[image2 drawInRect:CGRectMake(newSize.width/2, 0, newSize.width/2, newSize.height) blendMode:kCGBlendModeNormal alpha:1];

UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

NSString *strPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true) objectAtIndex:0];
strPath = [strPath stringByAppendingPathComponent:@"img.png"];
NSError *error = nil;
[[NSFileManager defaultManager] removeItemAtPath:strPath error:&error];

NSData *imgdata = UIImagePNGRepresentation(newImage);
[imgdata writeToFile:strPath atomically:false];
NSLog(@"Path = %@",strPath); //on this path image will be stored