iphone - 无法将两张图片合并为一张

Question

我正在尝试将两个图像合并为一个，并将该图像保存到相机胶卷上。但它只是显示一个空白图像。任何人都可以帮忙吗？

我的代码：

-(void)SaveFinalImage{    
    UIGraphicsBeginImageContext(self.view.bounds.size);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *savedImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageWriteToSavedPhotosAlbum(savedImg, nil, nil, nil);     
}

Answer 1

我在我的应用程序中使用了这个。

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();

有关更多信息，请参阅我关于同一主题的相关答案。iOS - 合并两个不同大小的图像