ios - stringWithContentsOfURL返回(空)

Question

我正在尝试使用以下代码将URL转换为字符串:

NSURL *urlOfOpenedFile = _service.myURLRequest.URL;
NSString *fileThatWasOpened = [NSString stringWithContentsOfURL:urlOfOpenedFile encoding:NSASCIIStringEncoding error:nil];

NSLog(@"url: %@", urlOfOpenedFile);
NSLog(@"string: %@", fileThatWasOpened);

返回:

url: file://localhost/Users/User/Library/Application%2520Support/iPhone%2520Simulator/6.0/Applications/72AA03A1-3967-4F22-9745-0722C8DE9FAC/Documents/downloads/My%20Document%20.pdf
string: (null)

谁能告诉我如何将URL转换为字符串？谢谢。

Answer 1

你可以用像
NSString *fileThatWasOpened = [NSString stringWithFormat:@"%@", url];