UIView截图
- (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;
}
UIScrollview截图
1 - (UIImage *)captureScrollView:(UIScrollView *)scrollView
2 {
3 UIImage* image = nil;
4 UIGraphicsBeginImageContext(scrollView.contentSize);
5 {
6 CGPoint savedContentOffset = scrollView.contentOffset;
7 CGRect savedFrame = scrollView.frame;
8 scrollView.contentOffset = CGPointZero;
9 scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
10
11 [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
12 image = UIGraphicsGetImageFromCurrentImageContext();
13
14 scrollView.contentOffset = savedContentOffset;
15 scrollView.frame = savedFrame;
16 }
17 UIGraphicsEndImageContext();
18
19 if (image != nil) {
20 return image;
21 }
22 return nil;
23 }
合并多张图片
1 - (UIImage *)composeWithHeader:(UIImage *)header content:(UIImage *)content footer:(UIImage *)footer
2 {
3 CGSize size = CGSizeMake(content.size.width, header.size.height +content.size.height +footer.size.height);
4 UIGraphicsBeginImageContext(size);
5 [header drawInRect:CGRectMake(0,
6 0,
7 header.size.width,
8 header.size.height)];
9 [content drawInRect:CGRectMake(0,
10 header.size.height,
11 content.size.width,
12 content.size.height)];
13 [footer drawInRect:CGRectMake(0,
14 header.size.height+content.size.height,
15 footer.size.width,
16 footer.size.height)];
17
18 UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
19 UIGraphicsEndImageContext();
20 return image;
21 }
