The problem is as stated in the title:
Performance 1: The cursor does not appear after the current UITextField is clicked, and other UITextField or UIButton on the same View cannot be operated;
Reason 1: The User Interaction Enabled option in the View property of the current UITextField is not checked;
Performance 2: The cursor does not appear after the current UITextField is clicked, and other UITextField or UIButton on the same View can be operated;
Reason 2: The User Interaction Enabled option in the current UITextField property is not checked;
Performance 3: The cursor appears after the current UITextField is clicked, and the computer keyboard can be used for input;
Reason 3: Because the simulator menu Hardware-keyboard is set to [link computer keyboard]; you can use the Shift + Command + K shortcut or the second in the menu Item close [link computer keyboard]; you can also use Command + K shortcut key or the third item in the menu [open emulator soft keyboard];