Question

我想对用户点击按钮时会看到的内容进行缩略图预览。或者，如果这不可能，则可以将上下文缩放到特定大小。我的上下文目前使用全屏，即1004x768像素。我希望这整个背景能够以300x300像素的速度出现而不会失去其身份。

Answer 1

试试这个

             UIGraphicsBeginImageContext(CGSizeMake(self.view.frame.size.height, self.view.frame.size.width));

            [self.view.layer renderInContext:UIGraphicsGetCurrentContext() ];
            UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
            NSLog(@"Screen Shot : %@",screenshot);
            UIGraphicsEndImageContext();


            // ATTACHING A SCREENSHOT
            NSData *myData = UIImagePNGRepresentation(screenshot);

            NSDate *date = [NSDate date];

            NSDateFormatter *df = [[NSDateFormatter alloc] init];
            [df setDateFormat:@"mm:ss"];
        NSString *timestamp = [df stringFromDate:date];
            NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            NSString *fullImagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"Image_%@.png",timestamp]];
        NSLog(@"TimeStamp = %@",timestamp);

            NSLog(@"Image Path : %@",fullImagePath);
            [myData writeToFile:fullImagePath atomically:YES];

如何拍摄我在石英2d中绘制的整个上下文

1 个答案: