小编Yiğ*_*lik的帖子

此URL返回JSON:

{
  query: {
    count: 1,
    created: "2015-12-09T17:12:09Z",
    lang: "en-US",
    diagnostics: {},
    ...
  }
}

我试过这个,但它不起作用:

responseObj = readJsonFromUrl('http://query.yahooapis.com/v1/publ...');
var count = responseObj.query.count;

console.log(count) // should be 1

如何从此URL的JSON响应中获取JavaScript对象？

我正在开发的应用程序可在iPhone和iPad上运行.应用程序具有的功能之一是从相机捕获图像.我正在使用UIImagePickerController来实现此功能.这是我的代码块;

self.imagePicker.sourceType = .camera            
self.imagePicker.cameraCaptureMode = .photo
self.present(self.imagePicker, animated: true, completion: nil)

该应用程序的工作原理是它在iPhone设计,当我在iPad上运行相同的代码应用冻结.此问题仅发生在iPad中,但仅适用于后置摄像头.如果我从图像选择器中选择前置摄像头,应用程序会启动摄像头,但是当按下开关摄像头按钮时它会冻结.

据我所知,日志问题发生在应用程序试图绘制相机时.

日志:

2016-12-20 20:10:33.708816 Ronin[681:148977] CGContextAddPath: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Dec 20 20:10:33  Ronin[681] <Error>: CGContextAddPath: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
2016-12-20 20:10:33.708925 Ronin[681:148977] clip: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Dec 20 20:10:33  Ronin[681] <Error>: clip: …