逝去的时光

Added two UITableViewController subclasses to the project. (These are trivial and just create NSArray instances containing the strings that are the contents of their tableview rows.) 

In the viewcontroller.xib file added two tableview controllers from the Library and set the Class Identity of these to the UITableViewController subclasses I just created in the project. 

Dragged the tableviews from these two view controllers into the main view and set their size, position and autoresizing properties. 

Unchecked the 'Autoresize View To Fill Screen' checkbox for the controllers.

Added two UITableViewController IBOutlets to the Main View controller's header and hooked these up in IB. This step is critical, although I don't know why. The controllers seem to be built even if these outlets don't exist but the table views don't appear if they don't exist. 

Also had to set the view outlet for the table view controllers in IB back to the two table views that are now inside the main view. 

It is necessary to check all the connections in IB very carefully. Use the list view mode. Control click on all the objects and inspect the little window that appears showing the outlet connections to see that everything is correct.

1. 在IB从Library拖拽一个controller,将这个controller设为你自己的继续的具体类
2. 从controller中将view拖出，拖到你自己的view作为subview
3. 设置controller的一些属性，比如去掉Fill Screen的选项
4. 将controller作为一个IBOutlet，不然这个subview不会显示

 CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGFloat cornerRadius = 6.;
    CGContextSaveGState(ctx);
    UIBezierPath *roundedPath = [UIBezierPath bezierPathWithRoundedRect:[self bounds] 
                                                           cornerRadius:cornerRadius];
    CGContextAddPath(ctx, [roundedPath CGPath]);
    CGContextRestoreGState(ctx);
    CGContextClip(ctx);