從兩個UIImageView創建一個UIImage

Question

我在UIView上有兩個UIImageView。 每個UIImageView都有一個UIImage。現在我想從兩個UIImageView創建一個UIImage。

請給出建議，我該如何做到這一點。

Answer 1

如果您有三個UIImageViews的一個視圖，並創建對應的出口

IBOutlet UIImageView *imageView1; 
IBOutlet UIImageView *imageView2; 
IBOutlet UIImageView *imageView3; 

你可以做一些類似下面的imageViews 1和2組合成的ImageView 3

UIGraphicsBeginImageContext(imageView1.image.size); 

CGRect rect = CGRectMake(0, 0, imageView1.image.size.width, imageView1.image.size.height); 

[imageView1.image drawInRect:rect]; 
[imageView2.image drawInRect:rect blendMode:kCGBlendModeScreen alpha:0.5]; 

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

[imageView3 setImage:resultingImage]; 

CGBlendMode讓你選擇以下任何合成操作爲您的圖像：

enum CGBlendMode { 
    kCGBlendModeNormal, 
    kCGBlendModeMultiply, 
    kCGBlendModeScreen, 
    kCGBlendModeOverlay, 
    kCGBlendModeDarken, 
    kCGBlendModeLighten, 
    kCGBlendModeColorDodge, 
    kCGBlendModeColorBurn, 
    kCGBlendModeSoftLight, 
    kCGBlendModeHardLight, 
    kCGBlendModeDifference, 
    kCGBlendModeExclusion, 
    kCGBlendModeHue, 
    kCGBlendModeSaturation, 
    kCGBlendModeColor, 
    kCGBlendModeLuminosity, 
    kCGBlendModeClear, 
    kCGBlendModeCopy, 
    kCGBlendModeSourceIn, 
    kCGBlendModeSourceOut, 
    kCGBlendModeSourceAtop, 
    kCGBlendModeDestinationOver, 
    kCGBlendModeDestinationIn, 
    kCGBlendModeDestinationOut, 
    kCGBlendModeDestinationAtop, 
    kCGBlendModeXOR, 
    kCGBlendModePlusDarker, 
    kCGBlendModePlusLighter 
};