iOS 对view进行截图的示例代码

- (UIImage *)convertViewToImage:(UIView *)view{
  // 第二个参数表示是否非透明。如果需要显示半透明效果，需传NO，否则YES。第三个参数就是屏幕密度了
  UIGraphicsBeginImageContextWithOptions(CGSizeMake(view.bounds.size.width, view.bounds.size.height * 0.8),YES,[UIScreen mainScreen].scale);
  [view.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

- (UIImage*)captureView:(UIView *)theView frame:(CGRect)frame{
  UIGraphicsBeginImageContextWithOptions(CGSizeMake(theView.bounds.size.width, theView.bounds.size.height*0.8), YES, [UIScreen mainScreen].scale);
  CGContextRef context = UIGraphicsGetCurrentContext();
  UIImage *img;
  if([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0){
    for(UIView *subview in theView.subviews){
      [subview drawViewHierarchyInRect:subview.bounds afterScreenUpdates:YES];
    }
    img = UIGraphicsGetImageFromCurrentImageContext();
  }else{
    CGContextSaveGState(context);
    [theView.layer renderInContext:context];
    img = UIGraphicsGetImageFromCurrentImageContext();
  }
  UIGraphicsEndImageContext();
  return img;
}