IOS学习 autoresizing 屏幕适配 父子视图

@interface HomeViewController ()

@property (nonatomic,retain)UIView *redView;

@end

@implementation HomeViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    _redView = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];

    _redView.backgroundColor = [UIColor redColor];

    [self.view addSubview:_redView];

    

    UIView *blueView = [[UIView alloc]initWithFrame:CGRectMake(50, 50, 50, 50)];

    blueView.backgroundColor = [UIColor blueColor];

    [_redView addSubview:blueView];

    //设置blueView属性

    /*   

     外部四根线勾选

     UIViewAutoresizingNone                 = 0,

     左侧灵活，外部右侧线勾选

     UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,

     宽度灵活，内部横向线勾选

     UIViewAutoresizingFlexibleWidth        = 1 << 1,

     右侧灵活，外部左侧线勾选

     UIViewAutoresizingFlexibleRightMargin  = 1 << 2,

     上部灵活，外部下侧线勾选

     UIViewAutoresizingFlexibleTopMargin    = 1 << 3,

     高度灵活，内部纵向线勾选

     UIViewAutoresizingFlexibleHeight       = 1 << 4,

     底部灵活，外部上侧线勾选

     UIViewAutoresizingFlexibleBottomMargin = 1 << 5

     */

    blueView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

   /*

    autoresizing  只能参照父类来设置  （了解）

    与autolayout 是互斥的，不能并存

    */

}

//点击触发事件

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    CGRect redbounds = _redView.bounds;

    redbounds.size.width += 20;

    redbounds.size.height += 20;

    

    _redView.bounds = redbounds;

}