iOS Development-Phoenix drop-down brush, how the dropdown table shows the view below it is not the background (resolved)

Ideas:

1. By listening to the Y-value of the Contentoffset property in the Scrolldidscroll proxy method, determine whether it is a pull-down or pull-up

2. Required third-party framework sdprogress to implement a pull-round pie fill

3. When the pie is filled with its properties Progress=1, the sdorgress is hidden (the original code is removed from the parent view, it is not good to operate after removal), and the table frame, The ORGINE.Y value is set to a certain height, and the table maintains a certain distance from the top of the controller to show the animation

4. When the pie disappears, create a uiimageview and start the animation

5. Simulate loading the data (get a delay or turn on the sub-thread for a few seconds), remove the Uiiamgeview, and load the frame with the completed table to a height of 0;

Difficulty: How to realize the uncovering layer

UIView * Bgview =[[UIView alloc]initwithframe:self.view.frame];

Bgview.backgrundcolor = [Uicolor Redcolor];

[Self.view Addsubview:bgview];

UITableView * table = [[UITableView alloc]initwithframe:self.view.frame];

[Self.view addsubview:table];

Table.backgrundcolor = [Uicolor clearcolor];//the background color of the table to be transparent

iOS Development-Phoenix drop-down brush, how the dropdown table shows the view below it is not the background (resolved)