点击button跳转到系统设置界面

NSString * urlString = @"App-Prefs:root=WIFI";
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:urlString]]) {
        if (@available(iOS 10.0, *)) {
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString] options:@{} completionHandler:nil];
        } else {
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];
        }
    }