隨着分享內容的需求的不斷完善,將當前頁面的內容分享出去變成了產品經理的需求,之前常規的的分享顯然已經不能滿足,紛紛開始定製分享的圖片內容。尤其以區塊鏈相關的App特別多,作爲運營拉新的手段,需要及時的將行情數據、免費贈送的token信息發送出去,激活用戶的熱情。通常看到的操作方式如下即:分享的圖片需要上下拼接內容,上半部分顯示爲App名稱、簡介, 下半部分爲註冊二維碼。但是行情頁面的分享已經超過了常規的屏幕可見內容, 需要將tableview未顯示的內容展示出來,無疑增加了難度。
下面將常用的幾種View生成圖片的方法做個歸類:
1.將傳入的View生成圖片:
+ (UIImage *)makeImageWithView:(UIView *)view{
CGSize s = view.bounds.size;
UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage*image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
2.將傳入的View生成圖片,可以顯示layer(分享分時圖、k線)
+ (UIImage *)imageFromView:(UIView *)view{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}
3.將tableview 生成圖片
+ (UIImage *)getTableViewimage:(UITableView *)tableview{
UIImage* viewImage = nil;
UIScrollView *scrollView = tableview;
UIGraphicsBeginImageContextWithOptions(CGSizeMake(scrollView.contentSize.width, scrollView.contentSize.height), NO, 0.0);
{
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()];
viewImage = UIGraphicsGetImageFromCurrentImageContext();
scrollView.contentOffset = savedContentOffset;
scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
if (viewImage != nil) {
return viewImage;
}
return nil;
}
4.圖片拼接
+ (UIImage *)addSlaveImage:(UIImage *)slaveImage toMasterImage:(UIImage *)masterImage {
CGSize size;
size.width = masterImage.size.width;
size.height = masterImage.size.height + slaveImage.size.height;
UIGraphicsBeginImageContextWithOptions(size, YES, 0.0);
[masterImage drawInRect:CGRectMake(0, 0, masterImage.size.width, masterImage.size.height)];
[slaveImage drawInRect:CGRectMake(0, masterImage.size.height, masterImage.size.width, slaveImage.size.height)];
UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultImage;
}