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;

}