截图发布推特表

Question

我正在我的应用程序中添加twitter功能来分享我当前视图控制器的屏幕截图。有什么内置的方法可以使用吗?

Answer 1

这个答案有以下创建截图的方法:

- (UIImage *)captureView:(UIView *)view {
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    UIGraphicsBeginImageContext(screenRect.size);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor blackColor] set];
    CGContextFillRect(ctx, screenRect);
    [view.layer renderInContext:ctx];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

它返回一个UIImage，你可以像这样使用它:

SLComposeViewController *tweetSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
tweetSheet.image = [self captureView:self.view]; // or self.navigationController.view
[self presentViewController:tweetSheet animated:YES completion:^{}];