iOS 10拨打系统电话弹出框延迟出现问题的解决

// 拨打电话 + (void)callPhone:(NSString *)phoneNum {    if ([ISNULL(phoneNum) length] == 0) {   [SVProgressHUD showErrorWithStatus:@"拨打失败，手机号码不存在" duration:1.0 dismiss:nil];   return;  }    NSString *callPhone = [NSString stringWithFormat:@"telprompt://%@", phoneNum];    /// 解决iOS10及其以上系统弹出拨号框延迟的问题  /// 方案一  if ([[UIDevice currentDevice].systemVersion floatValue] >= 10.0) {   /// 10及其以上系统   [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone] options:@{} completionHandler:nil];  } else {   /// 10以下系统   [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone]];  }    /// 方案二 // dispatch_async(dispatch_get_global_queue(0, 0), ^{ //  [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone]]; // });   }