我面臨以下問題：由于合并，我必須合并兩個圖像A和B以創建新圖像C。我已經知道如何合并兩個圖像，但是在這種情況下，我的目標有所不同。我希望圖像A將作為圖像B的背景。例如，如果圖像A的尺寸為500x500，圖像B的尺寸為460x460，我希望圖像C（合并的圖像結果）為500x500，圖像B（ 460x460）居中。在此先感謝您的幫助或建議
3 回答
慕的地10843
TA貢獻1785條經驗 獲得超8個贊
這是我在應用程序中所做的，但是沒有使用UIImageView：
UIImage *bottomImage = [UIImage imageNamed:@"bottom.png"]; //background image
UIImage *image = [UIImage imageNamed:@"top.png"]; //foreground image
CGSize newSize = CGSizeMake(width, height);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.8];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
如果圖像已經具有不透明度，則無需進行設置（如在bottomImage中），否則可以進行設置（與圖像一樣）。
在這之后UIImage創建，那么你可以將它嵌入到你的UIImageView
更新：感謝Ahmet AkkoK-對于Swift（2.2）用戶，混合模式宏已更改。CGBlendMode .kCGBlendModeNormal被替換為CGBlendMode.Normal
慕標5832272
TA貢獻1966條經驗 獲得超4個贊
嘿，我得到了多張圖像，并添加了具有不同前景的相同背景。
UIImage *bottomImage = [UIImage imageNamed:@"photo 2.JPG"]; //background image
UIImage *image = [UIImage imageNamed:@"photo 3.JPG"]; //foreground image
UIImage *image1 = [UIImage imageNamed:@"photo 4.JPG"]; //foreground image
UIImage *image2 = [UIImage imageNamed:@"photo 5.JPG"]; //foreground image
CGSize newSize = CGSizeMake(320, 480);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.4];
[image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.3];
[image2 drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.2];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
resultView = [[UIImageView alloc] initWithImage:newImage];
resultView.frame = CGRectMake(0, 0,320,460);
[self.view addSubview:resultView];
慕桂英3389331
TA貢獻2036條經驗 獲得超8個贊
剛剛為想要使用Srikar Appal答案的用戶提供了快速粘貼功能。（如果背景圖片和前景圖片的大小不同）
- (UIImage *) mergeImages:(NSString *)bgImageFileName foreGround:(NSString *)fgImageFileName {
UIImage *bottomImage = [UIImage imageNamed:bgImageFileName]; //background image
UIImage *image = [UIImage imageNamed:fgImageFileName]; //foreground image
CGSize newSize = CGSizeMake(bottomImage.size.width, bottomImage.size.height);
UIGraphicsBeginImageContext(newSize);
// Use existing opacity as is
[bottomImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
// Change xPos, yPos if applicable
[image drawInRect:CGRectMake(11,11,image.size.width,image.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
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