如果您尝试从Web URL显示PDF文件,请使用以下代码.

NSURL *targetURL = [NSURL URLWithString:@"http://yourdomain.com/file_toopen.pdf"];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webView loadRequest:request];

或者,如果您的应用程序中捆绑了PDF文件,请使用以下代码.

NSString *path = [[NSBundle mainBundle] pathForResource:@"filetoopen" ofType:@"pdf"];
NSURL *targetURL = [NSURL fileURLWithPath:path];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webView loadRequest:request];