iOS编程中滑动截图

截取view,返回图片

+ (UIImage *)captureScreenView:(UIView *)view {
    UIGraphicsBeginImageContextWithOptions(view.size, YES, 0.0); //currentView 当前的view  创建一个基于位图的图形上下文并指定大小为
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];//renderInContext呈现接受者及其子范围到指定的上下文
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();//返回一个基于当前图形上下文的图片
    UIGraphicsEndImageContext();
    return image;
}

截取ScrollView,返回图片

+(UIImage *)captureScreenScrollView:(UIScrollView *)scrollView {
    CGPoint savedContentOffset = scrollView.contentOffset;
    CGRect savedFrame = scrollView.frame;

    scrollView.frame = CGRectMake(0, scrollView.frame.origin.y, scrollView.contentSize.width, scrollView.contentSize.height);
    UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, YES, 0.0); //currentView 当前的view  创建一个基于位图的图形上下文并指定大小为
    [scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];//renderInContext呈现接受者及其子范围到指定的上下文
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();//返回一个基于当前图形上下文的图片

    scrollView.contentOffset = savedContentOffset;
    scrollView.frame = savedFrame;

    UIGraphicsEndImageContext();
    return image;
}