IOS中级篇 —— Autoresizing

 

UIView *blueView = [[UIView alloc] init];

    [self.view addSubview:blueView];
    blueView.backgroundColor = [UIColor blueColor];
   

    blueView.center = self.view.center;

    blueView.bounds = CGRectMake(0, 0, 150, 150);

    self.blueView = blueView;

   
    /*
     Flexible 灵活的,自由的
    
     typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
     UIViewAutoresizingNone                 = 0,
     UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,
//   左边是自由的,右边是固定的(与storyboard中相反)
     UIViewAutoresizingFlexibleWidth        = 1 << 1,
//   宽度是可拉伸的
    
     UIViewAutoresizingFlexibleRightMargin  = 1 << 2,
//    右边是自由的,左边是固定的(与storyboard中相反)
     UIViewAutoresizingFlexibleTopMargin    = 1 << 3,
//    顶部是自由的,底部是固定的(与storyboard中相反)
     UIViewAutoresizingFlexibleHeight       = 1 << 4,
//   高度是自由的(高度是可拉伸的)
     UIViewAutoresizingFlexibleBottomMargin = 1 << 5
//    底部是自由的,顶部是固定的(与storyboard中相反)
     };
    
    
     */
//  四周固定,中间灵活
//    redView.autoresizingMask  =   UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
//  四周灵活,中间固定
//  多个通过 "|" 进行连接

    blueView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleBottomMargin;