iOS 代码自选区域截屏，给指定的view截屏

1.普通界面

/**

*截图功能

*/

-(void)screenShot{

UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, 960), YES, 0);

//设置截屏大小

[[self.view layer] renderInContext:UIGraphicsGetCurrentContext()];

UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

CGImageRef imageRef = viewImage.CGImage;

CGRect rect = CGRectMake(0, 0, 641, SCREEN_HEIGHT + 300);//这里可以设置想要截图的区域

CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);

UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect];

//以下为图片保存代码

UIImageWriteToSavedPhotosAlbum(sendImage, nil, nil, nil);//保存图片到照片库

NSData *imageViewData = UIImagePNGRepresentation(sendImage);

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *pictureName= @"screenShow.png";

NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:pictureName];

[imageViewData writeToFile:savedImagePath atomically:YES];//保存照片到沙盒目录

CGImageRelease(imageRefRect);

//从手机本地加载图片

UIImage *bgImage2 = [[UIImage alloc]initWithContentsOfFile:savedImagePath];

}

2.UIScrollView截屏（一屏无法显示完整）

/**

*截图

*/

- (void)screenShot{

UIImage* image = nil;

UIGraphicsBeginImageContext(m_scrollView.contentSize);

{

CGPoint savedContentOffset = m_scrollView.contentOffset;

CGRect savedFrame = m_scrollView.frame;

m_scrollView.contentOffset = CGPointZero;

m_scrollView.frame = CGRectMake(0, 0, m_scrollView.contentSize.width, m_scrollView.contentSize.height);        [m_scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];

image = UIGraphicsGetImageFromCurrentImageContext();

m_scrollView.contentOffset = savedContentOffset;

m_scrollView.frame = savedFrame;

}

UIGraphicsEndImageContext();

if (image != nil) {

NSLog(@"截图成功!");

}

}

给指定view截屏

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();