iOS跳转到系统设置界面

OC版： 跳转到设置界面

```NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];;```

[[UIApplication sharedApplication] openURL:url];

swift版：跳转到设置界面

NSURL *url = NSURL(string: UIApplicationOpenSettingsURLString);

UIApplication.sharedApplication().openURL(url)