ios调用应用的设置界面

1.在项目targets -> Info -> URL types 中，添加URL Schemes : Prefs.

2.调用代码：

    NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];    if ([[UIApplication sharedApplication] canOpenURL:url]) {        [[UIApplication sharedApplication] openURL:url];    }