Ios-PHP to mobile development

I am engaged in PHP and want to switch to mobile development. I hesitate in Android and IOS. could someone tell me whether to learn OC or swift in IOS? Are there any learning roadmap or good learning resources? Thank you! I am engaged in PHP and want to switch to mobile development. I hesitate in Android and IOS. please come and give me some advice.
In IOS, is it OC or swift? Are there any learning roadmap or good learning resources?
Thank you!

Reply content:

I am engaged in PHP and want to switch to mobile development. I hesitate in Android and IOS. please come and give me some advice.
In IOS, is it OC or swift? Are there any learning roadmap or good learning resources?
Thank you!

In the same case, IOS is 1 ~ higher than Android ~ 2 K. for IOS, it is recommended to select swift. now swift2 is open-source.
In the future will be the mainstream, learning resources can look at the http://www.tianmaying.com here
If you are just getting started, you can get a try. there is no charge for the whole course. if you have a teacher from Peking University to teach, you 'd better buy your own book.
The above is my personal opinion. In fact, there is still a lack of Android experience. my friend company has been recruiting Android programmers recently.
By the way, you have to buy an apple for IOS.