iphone - 在iPhone中将两个图像合并为一个图像

我需要将两个图像合并为一个图像，这是我的代码：

-(UIImage*)mergeImage:(UIImage*)mask overImage:(UIImage*)source inSize:(CGSize)size
{
    //Capture image context ref

    UIImageView *totalimage=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];

    UIImageView *firstImage=[[UIImageView alloc] initWithImage:mask];
    UIImageView *secondImage=[[UIImageView alloc] initWithImage:source];

    [totalimage addSubview:firstImage];
    [totalimage addSubview:secondImage];

    UIGraphicsBeginImageContext(totalimage.bounds.size);
    [totalimage.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //Draw images onto the context
    [source drawInRect:CGRectMake(0, 0, source.size.width, source.size.height)];
    [mask drawInRect:CGRectMake(0, 0, mask.size.width, mask.size.height)];

    return viewImage;

}

我称这种方法如下：

UIImage *totalImage = [self mergeImage:self.Apicimage overImage:questionImage inSize:CGSizeMake(100, 100)];

但是执行时，我得到以下输出：

Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSaveGState: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSetBlendMode: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSetAlpha: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextTranslateCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextScaleCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextConcatCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextDrawImage: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextRestoreGState: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSaveGState: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSetBlendMode: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextSetAlpha: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextTranslateCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextScaleCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextConcatCTM: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextDrawImage: invalid context 0x0
Jun 15 16:11:06 iPad-2 VueGuides[9195] <Error>: CGContextRestoreGState: invalid context 0x0

谁能指导我。如何合并两个图像？

最佳答案

您的代码

[source drawInRect:CGRectMake(0, 0, source.size.width, source.size.height)];
    [mask drawInRect:CGRectMake(0, 0, mask.size.width, mask.size.height)];

应该写在

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

关于iphone - 在iPhone中将两个图像合并为一个图像，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11031440/