ios調用應用的設置界面

1.在項目targets -> Info -> URL types 中，添加URL Schemes : Prefs.

2.調用代碼：

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

    }