When the user taps on a text field, I wanted to darken the rest of the screen (everything below the text box, above the keyboard) to make it clear what they should be doing. I believe it involved putting a transparent UI view down and adding a gesture recognizer to it, but I'm not quite sure how to do that. When the user taps on a text field, I wanted to
阅读背景：
用户在输入时，将覆盖层变暗
来源：互联网
分享到：
