Due to Apple Inc. internal policy, the "Untrusted Enterprise Developer" prompt appears when first installing an Enterprise application on an iOS system
The solution is as follows (iOS12 system as an example):
1、open the settings in the phone function, select "General"
2、In General, select the "Profile and Device Management" featurevv
3、In the description file and device management in the enterprise application category, select the file name of the enterprise application to be installed (with the prompt when opening), click to enter
4、After entering the enterprise signature page, confirm the company name and application name in the enterprise signature, click the trust "company name of the enterprise signature"
5、back to the desktop, re-open the application to use