ios 截图 ,图片合成，画纯色UIimage

1、截取部分UIImage

 -(UIImage *)clipImageFromImage:(UIImage *)orgImage  Rect:(CGRect)clipRect{
     CGImageRef imageRef = orgImage.CGImage;
     CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, clipRect);
     CGSize size;
     size = clipRect.size;
     UIGraphicsBeginImageContext(size);
     CGContextRef context = UIGraphicsGetCurrentContext();
     CGContextDrawImage(context, clipRect, subImageRef);
     UIImage* clipImage = [UIImage imageWithCGImage:subImageRef];
     CGImageRelease(subImageRef);
     UIGraphicsEndImageContext();
     return clipImage;
 }

 

2图片合成：

 - (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {
     UIGraphicsBeginImageContext(image1.size);
     [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];
     [image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];
     UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return resultingImage;
 }

 

 3画纯色UIImage

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

1、截取部分UIImage

 -(UIImage *)clipImageFromImage:(UIImage *)orgImage  Rect:(CGRect)clipRect{
     CGImageRef imageRef = orgImage.CGImage;
     CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, clipRect);
     CGSize size;
     size = clipRect.size;
     UIGraphicsBeginImageContext(size);
     CGContextRef context = UIGraphicsGetCurrentContext();
     CGContextDrawImage(context, clipRect, subImageRef);
     UIImage* clipImage = [UIImage imageWithCGImage:subImageRef];
     CGImageRelease(subImageRef);
     UIGraphicsEndImageContext();
     return clipImage;
 }

 

2图片合成：

 - (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {
     UIGraphicsBeginImageContext(image1.size);
     [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];
     [image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];
     UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return resultingImage;
 }

 

 3画纯色UIImage

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




 UIGraphicsEndImageContext();