Question

我正在使用Auk lib在滑块中显示我的图像，我需要为每个图像设置描述。我怎么能这么做呢？现在我正在尝试下载图像，然后在其上设置描述：

    override func viewDidLoad() {
        super.viewDidLoad()

        for picture in LogInViewController.dictionaryForSlider
        {
            //scrollView.auk.show(url: picture.key, accessibilityLabel: picture.value)
            let downloadedPic: UIImage = self.downloadImage(urlStr: picture.key)
            let newPic: UIImage = self.textToImage(drawText: picture.value as NSString, inImage: downloadedPic, atPoint: CGPoint(x: 10, y: 10))

            scrollView.auk.show(image: newPic)
        }

    }


    func textToImage(drawText text: NSString, inImage image: UIImage, atPoint point: CGPoint) -> UIImage {
        let textColor = UIColor.white
        let textFont = UIFont(name: "Helvetica Bold", size: 12)!

        let scale = UIScreen.main.scale
        UIGraphicsBeginImageContextWithOptions(image.size, false, scale)

        let textFontAttributes = [
            NSFontAttributeName: textFont,
            NSForegroundColorAttributeName: textColor,
            ] as [String : Any]
        image.draw(in: CGRect(origin: CGPoint.zero, size: image.size))

        let rect = CGRect(origin: point, size: image.size)
        text.draw(in: rect, withAttributes: textFontAttributes)

        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage!
    }

    func downloadImage(urlStr: String) -> UIImage {
        var img: UIImage? = nil
        var imgURL: NSURL = NSURL(string: urlStr)!
        let request: NSURLRequest = NSURLRequest(url: imgURL as URL)
        NSURLConnection.sendAsynchronousRequest(
            request as URLRequest, queue: OperationQueue.main,
            completionHandler: { response,data,error in
                if error == nil {
                    img = UIImage(data: data!)
                }
        })
        return img!
    }

但我收到了这个错误：

2017-03-25 08：02：04.627615 app1 [314：25451]致命错误：意外在解包可选值时发现nil

在这个字符串上：

return img!

我该如何解决？或者是否有其他简单的方法来设置描述图像？

Answer 1

我只使用UIScrollViewDelegate处理它而没有任何额外的libs / GB代码XD

#include <iostream>
#include "string.h"

using namespace std;

struct A {
    char* a;
};

int main()
{
    struct A *x;
    x->a = "soumya";
    char* str = "soumya";
    cout<<str<<endl<<(char*)x->a<<endl;
   // if(strcmp(x->a,str)!=0)
  //  {
   //     cout<<"not same"<<endl;
   // }

    return 0;
}

添加描述到图像Auk lib

1 个答案: