适配iOS10 调取系统打电话功能

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:
[NSString stringWithFormat:@"tel:%@",cell.detailTextLabel.text]] 
options:@{UIApplicationOpenURLOptionUniversalLinksOnly:@(NO)} 
completionHandler:nil];

此处关键在于options的设置：
在UIApplication.h 处有提供

// Option for openURL:options:CompletionHandler: only open URL if it is a valid universal link with an application configured to open it
// If there is no application configured, or the user disabled using it to 
open the link, completion handler called with NO
UIKIT_EXTERN NSString *const UIApplicationOpenURLOptionUniversalLinksOnly NS_AVAILABLE_IOS(10_0);

设置UIApplicationOpenURLOptionUniversalLinksOnly为YES并打开URL时, 如果用户并没有安装app那它就会失败，同时会调用safari来打开这个链接。

参见：
What's New in iOS -查看UIKit 部分

Querying URL Schemes with canOpenURL

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