ios 截图 ,图片合成，画纯色UIimage

1、截取部分UIImage

C代码  

1. -(UIImage *)clipImageFromImage:(UIImage *)orgImage  Rect:(CGRect)clipRect{  
2.     CGImageRef imageRef = orgImage.CGImage;  
3.     CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, clipRect);  
4.     CGSize size;  
5.     size = clipRect.size;  
6.     UIGraphicsBeginImageContext(size);  
7.     CGContextRef context = UIGraphicsGetCurrentContext();  
8.     CGContextDrawImage(context, clipRect, subImageRef);  
9.     UIImage* clipImage = [UIImage imageWithCGImage:subImageRef];  
10.     CGImageRelease(subImageRef);  
11.     UIGraphicsEndImageContext();  
12.     return clipImage;  
13. }  

 

2图片合成：

Java代码  

1. - (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {  
2.     UIGraphicsBeginImageContext(image1.size);  
3.     [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];  
4.     [image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];  
5.     UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
6.     UIGraphicsEndImageContext();  
7.     return resultingImage;  
8. }  

 

 3画纯色UIImage

Java代码  

1. CGSize imageSize = CGSizeMake(50, 50);  
2. UIGraphicsBeginImageContextWithOptions(imageSize, 0, [UIScreen mainScreen].scale);  
3. [[UIColor colorWithRed:0 green:0 blue:0 alpha:1.0] set];  
4. UIRectFill(CGRectMake(0, 0, imageSize.width, imageSize.height));  
5. UIImage *pressedColorImg = UIGraphicsGetImageFromCurrentImageContext();  
6. UIGraphicsEndImageContext();  

1、截取部分UIImage

C代码  

1. -(UIImage *)clipImageFromImage:(UIImage *)orgImage  Rect:(CGRect)clipRect{  
2.     CGImageRef imageRef = orgImage.CGImage;  
3.     CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, clipRect);  
4.     CGSize size;  
5.     size = clipRect.size;  
6.     UIGraphicsBeginImageContext(size);  
7.     CGContextRef context = UIGraphicsGetCurrentContext();  
8.     CGContextDrawImage(context, clipRect, subImageRef);  
9.     UIImage* clipImage = [UIImage imageWithCGImage:subImageRef];  
10.     CGImageRelease(subImageRef);  
11.     UIGraphicsEndImageContext();  
12.     return clipImage;  
13. }  

 

2图片合成：

Java代码  

1. - (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {  
2.     UIGraphicsBeginImageContext(image1.size);  
3.     [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];  
4.     [image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];  
5.     UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
6.     UIGraphicsEndImageContext();  
7.     return resultingImage;  
8. }  

 

 3画纯色UIImage

Java代码  

1. CGSize imageSize = CGSizeMake(50, 50);  
2. UIGraphicsBeginImageContextWithOptions(imageSize, 0, [UIScreen mainScreen].scale);  
3. [[UIColor colorWithRed:0 green:0 blue:0 alpha:1.0] set];  
4. UIRectFill(CGRectMake(0, 0, imageSize.width, imageSize.height));  
5. UIImage *pressedColorImg = UIGraphicsGetImageFromCurrentImageContext();  
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10. UIGraphicsEndImageContext();  

4.把图片绘图到对应区域,在中间

- (UIImage*)clipImageFromImage:(UIImage *)orgImage Rect:(CGRect)targetRect

{

    UIGraphicsBeginImageContextWithOptions(targetRect.size,NO, [UIScreenmainScreen].scale);

    [orgImage drawInRect:CGRectMake((targetRect.size.width-orgImage.size.width)/2.0, (targetRect.size.height-orgImage.size.height)/2.0, orgImage.size.width, orgImage.size.height)];

    UIImage *resultingImage =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return resultingImage;

}