CGImageCreateWithImageInRect 使用示例

- (void)viewDidLoad {

    [superviewDidLoad];

CGRectframe=CGRectMake(520,280,320,480);

CGImageRefsmall;

small=CGImageCreateWithImageInRect([[UIImageimageNamed:@"3.png"]CGImage],frame);

UIImageView*test=[[UIImageViewalloc]initWithImage:[UIImageimageWithCGImage:small]];

[self.viewaddSubview:test];

[testrelease];

}

合成图片的两种方法，思路都是一样的

// Image＋Image ICON

- (UIImage*)addImage:(UIImageView*)image1 toImage:(UIImageView*)image2 {

CGSizesize=CGSizeMake( image1.frame.size.width,image1.frame.size.height);

UIGraphicsBeginImageContext(size);

    

   // Draw image1

[image2.image drawInRect:CGRectMake(6,6, image2.frame.size.width, image2.frame.size.height)];

    

// Draw image2    

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

    

UIImage*resultingImage =UIGraphicsGetImageFromCurrentImageContext();

    

UIGraphicsEndImageContext();

    

returnresultingImage;

}

- (UIImage*)addImageview:(UIImage*)image1 toImage:(UIImage*)image2 {

CGSizesize=CGSizeMake( image1.size.width,image1.size.height);

UIGraphicsBeginImageContext(size);

    

   // Draw image1

[image2drawInRect:CGRectMake(4.5,6,77,77)];

    

// Draw image2    

[image1drawInRect:CGRectMake(0,0, image1.size.width, image1.size.height)];

    

UIImage*resultingImage =UIGraphicsGetImageFromCurrentImageContext();

    

UIGraphicsEndImageContext();

    

returnresultingImage;

}

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