First: it is not the technical difficulty of IOS. IOS is simpler than JAVAEE or ANDROID. The reason for the high salary. It's not how difficult your skills are. But how many people can learn. The first school didn't teach IOS. That is to say. Most programmers don't know about IOS. The reason is that most people report what they have learned in school. Will not easily change a technology. Second: it is difficult to learn IOS. It is difficult to spend money to learn IOS. You must have an Apple mobile phone first. Apple Computer Apple Developer Account. These expenses add up to nearly 1.5 million. Who would be a programmer willing to spend 1.5 million to relearn a technology he has never been exposed to? Of course there is. Just less. Third, there are few training institutions. I'm sure. Training institutions without money are afraid to open IOS. Because of the equipment. An apple computer is close to 10 thousand. Plus, please meet the senior teacher of IOS. That's nearly 50% of the annual salary. The total cost will be millions of dollars a year. There is no guarantee that how many students will come to school. Therefore, there are not many training institutions with IOS training at present. Fourth: the demand is large. As long as your company has Android. The boss will definitely want to make another Apple version. So the demand for ios naturally increased. Fifth: Apple's review of the code is very strict. That is to say. There is basically no code for you to copy when you do IOS. There will always be audits that fail. That can't pass the audit. This has led to the need for companies to have IOS programmers who put products on the shelves. But not many students even learn IOS. What's more, some students have put the products on the shelves? About the prospect of apple. I'm sure. At least in the next 20 years. Apple products still belong to the world's leading products. Why are you so sure? Because they are all Android or something. They are all based on LINUX, but Apple is based on UNIX. Simply put, the reason why Apple 4S has a memory speed of 5 12 is actually faster than Xiaomi 1G memory. . That explains it. Apple doesn't need 4G memory, 8G memory. Can be used smoothly. In case Andrew really drives Apple into a hurry. Android has 8 GB of memory. Apple also has 8G memory. Then Apple is still faster than Android. So no matter how improved Android is. His system is still LINUX. Still not as good as UNIX