BOOL isInstalled = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]];
if (!isInstalled) {
//没有安装Facebook
}else{
//安装了Facebook
}
注意事项
1.得在info.plist将fb加入白名单,否则检测无效
<key>LSApplicationQueriesSchemes</key>
<array>
<string>fb</string>
</array>
