截取整個view:

-(UIImage*)captureView:(UIView *)theView{CGRect rect = theView.frame;if ([theView isKindOfClass:[UIScrollView class]]) {rect.size = ((UIScrollView *)theView).contentSize;}UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();[theView.layer renderInContext:context];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return img; }

截取view上某一部分:

-(UIImage *)cropImage:(UIImage *)image rect:(CGRect)cropRect {CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], cropRect);UIImage *img = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef);return img; }

截取scrollerView:

- (UIImage *)captureScrollView:(UIScrollView *)scrollView{UIImage* image = nil;UIGraphicsBeginImageContext(scrollView.contentSize);{CGPoint savedContentOffset = scrollView.contentOffset;CGRect savedFrame = scrollView.frame;scrollView.contentOffset = CGPointZero;scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];image = UIGraphicsGetImageFromCurrentImageContext();scrollView.contentOffset = savedContentOffset;scrollView.frame = savedFrame;}UIGraphicsEndImageContext();if (image != nil) {return image;}return nil; }

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多張圖片的拼接:

- (UIImage *)composeWithHeader:(UIImage *)header content:(UIImage *)content footer:(UIImage *)footer{CGSize size = CGSizeMake(content.size.width, header.size.height +content.size.height +footer.size.height);UIGraphicsBeginImageContext(size);[header drawInRect:CGRectMake(0,0,header.size.width,header.size.height)];[content drawInRect:CGRectMake(0,header.size.height,content.size.width,content.size.height)];[footer drawInRect:CGRectMake(0,header.size.height+content.size.height,footer.size.width,footer.size.height)];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image; }

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轉載于:https://www.cnblogs.com/gaoxiaoniu/p/5315420.html

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