Scalanie dwóch obrazów do jednego obrazu programowo w iphone

Question

Witam Pracuję nad aplikacją, która wymaga scalenia dwóch obrazów, mój rozmiar obrazu to 320 * 240 poprzez scalenie obu obrazów. Chcę mieć rozmiar 320 * 480. Jak mogę to zrobić programowo? Poniżej znajdują się obrazy

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Answer 1

Wystarczy przetestowane, stwórz kontekst na podstawie rozmiarów obrazy, które pracują z i wyciągnąć je na szczycie siebie (zakładając, że są tej samej szerokości):

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

CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height); 

UIGraphicsBeginImageContext(size); 

[image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)]; 
[image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)]; 

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); 

UIGraphicsEndImageContext(); 

//Add image to view 
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)]; 
imageView.image = finalImage; 
[self.view addSubview:imageView]; 

Answer 2

UIImage *Image1 = [[UIImage alloc] initWithData:data]; 
UIImage *Image2 = [[UIImage alloc] initWithData:data]; 
// Set up width height with values. 
     CGSize newSize = CGSizeMake(width, height); 
     UIGraphicsBeginImageContext(newSize); 

     [Image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; 

     [Image2 drawInRect:CGRectMake(newSize.width,newSize.height,newSize.width,newSize.height*2) blendMode:kCGBlendModeNormal alpha:1.0]; 

     UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext(); 

     UIGraphicsEndImageContext(); 

Answer 3

myślę, że trzeba dostać konteksty ypur obrazów, a następnie marge go.

UIImage *eyes = [UIImage imageNamed:@"eyes"]; 
    UIGraphicsBeginImageContext(CGSizeMake(m, n)); 
    CGContextRef context1 = UIGraphicsGetCurrentContext(); 

    UIImage *mouth = [UIImage imageNamed:@"mouth"]; 
    UIGraphicsBeginImageContext(CGSizeMake(m, n)); 
    CGContextRef context2 = UIGraphicsGetCurrentContext(); 

Merge czerpiąc z różnych kontekst granic

Answer 4

można użyć dwóch różnych obrazów widoki jeden poniżej other.and przypisać dwa różne obrazy.

Answer 5

Aby uniknąć poniżającego jakość obrazu, użyj UIGraphicsBeginImageContextWithOptions.

Jeżeli określono wartość 0,0, współczynnik skali jest ustawiony na skalę czynnika głównego ekranu urządzenia.

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

CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height); 

UIGraphicsBeginImageContextWithOptions(size, false, 0.0) // Use this call 

[image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)]; 
[image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)]; 

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); 

UIGraphicsEndImageContext(); 

//Add image to view 
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)]; 
imageView.image = finalImage; 
[self.view addSubview:imageView]; 

Answer 6

#pragma mark - merging two images 
-(void)mergeimage :(UIImage*)firstImage withImage:(UIImage*)secondImage{ 



    CGSize size = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height)); 


    UIGraphicsBeginImageContext(size); 


    [firstImage drawInRect:CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y,size.width/2,size.height)]; 


    [secondImage drawInRect:CGRectMake(self.view.frame.origin.x+(size.width/2),self.view.frame.origin.y,size.width/2,size.height)]; 

    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); 


    UIGraphicsEndImageContext(); 
} 

Answer 7

Swift Wersja

func getMixedImg(image1: UIImage, image2: UIImage) -> UIImage { 

    var size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height) 

    UIGraphicsBeginImageContext(size) 

    image1.drawInRect(CGRectMake(0,0,size.width, image1.size.height)) 
    image2.drawInRect(CGRectMake(0,image1.size.height,size.width, image2.size.height)) 
    var finalImage = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 

    return finalImage 
} 

Dostaniesz swój wizerunek, aby wywołać tę funkcję tak:

var myimage1 = UIImage(named: "image1.png") 
var myimage2 = UIImage(named: "image2.png") 

var finalMixedImage = getMixedImg(myimage1!, image2: myimage2!) 

Answer 8

Swift 3:

akceptuje tablicę obrazów i zwraca obraz obrazów jeden na drugim trwa max rozmiary pod uwagę dlatego losless

func combineTopToBottom(imagesArray:[UIImage]) -> UIImage? { 
    var dimensions = CGSize(width: 0.0, height: 0.0) 
    for image in imagesArray { 
     dimensions.width = max(dimensions.width, image!.size.width) 
     dimensions.height += max(dimensions.height, image!.size.height) 
    } 

    UIGraphicsBeginImageContext(dimensions) 

    var lastY = CGFloat(0.0) 
    for image in imagesArray { 
     image?.draw(in:CGRect(x: 0, y: lastY, width: dimensions.width, height: image!.size.height)) 
     lastY += image!.size.height 
    } 

    let finalImage = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 

    return finalImage 
} 

Answer 9

Implementacja ta działa dla zmiennej liczbie argumentów argumentów, więc można przejść nieograniczona liczba obrazów do łączenia w pionie:

public static func mergeVertically(images: UIImage...) -> UIImage? { 
    let maxWidth = images.reduce(0.0) { max($0, $1.size.width) } 
    let totalHeight = images.reduce(0.0) { $0 + $1.size.height } 

    UIGraphicsBeginImageContextWithOptions(CGSize(width: maxWidth, height: totalHeight), false, 0.0) 
    defer { 
     UIGraphicsEndImageContext() 
    } 

    let _ = images.reduce(CGFloat(0.0)) { 
     $1.draw(in: CGRect(origin: CGPoint(x: 0.0, y: $0), size: $1.size)) 
     return $0 + $1.size.height 
    } 

    return UIGraphicsGetImageFromCurrentImageContext() 
} 

Answer 10

// DODATKOWA Swift 3.2 i 4.0

@IBOutlet weak var imgCamera1: UIImageView! 
@IBOutlet weak var imgCamera2: UIImageView! 

    let image1 = imgCamera1.image 
    let image2 = imgCamera2.image 

    let size = CGSize(width: image1?.size.width ?? 0.0, height: (image1?.size.height)! + (image2?.size.height)!) 
    UIGraphicsBeginImageContext(size) 
    image1?.draw(in: CGRect(x: 0, y: 0, width: size.width, height: image1?.size.height ?? 0.0)) 
    image2?.draw(in: CGRect(x: 0, y: image1?.size.height ?? 0.0, width: size.width, height: image2?.size.height ?? 0.0)) 

    let finalImage = UIGraphicsGetImageFromCurrentImageContext(); 

    UIGraphicsEndImageContext(); 


    //Add image to view 
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: finalImage?.size.width ?? 0.0, height: finalImage?.size.height ?? 0.0)) 
    imageView.image = finalImage 

    //Displaying Image 
    // view.addSubview(imageView)