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iOS -- autoResizingMask使用(转)

autoResizingMask 是UIView的一个属性,在一些简单的布局中,使用autoResizingMask,可以实现子控件相对于父控件的自动布局。

autoResizingMask 是UIViewAutoresizing 类型的,其定义为:

@property(nonatomic) UIViewAutoresizing autoresizingMask;    // simple resize. default is UIViewAutoresizingNone

 

UIViewAutoresizing 是一个枚举类型,默认是 UIViewAutoresizingNone,其可以取得值有:

typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {    UIViewAutoresizingNone                 = 0,    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,    UIViewAutoresizingFlexibleWidth        = 1 << 1,    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,    UIViewAutoresizingFlexibleHeight       = 1 << 4,    UIViewAutoresizingFlexibleBottomMargin = 1 << 5};

 

各属性解释:

UIViewAutoresizingNone

不会随父视图的改变而改变

UIViewAutoresizingFlexibleLeftMargin

自动调整view与父视图左边距,以保证右边距不变

UIViewAutoresizingFlexibleWidth

自动调整view的宽度,保证左边距和右边距不变

UIViewAutoresizingFlexibleRightMargin

自动调整view与父视图右边距,以保证左边距不变

UIViewAutoresizingFlexibleTopMargin

自动调整view与父视图上边距,以保证下边距不变

UIViewAutoresizingFlexibleHeight

自动调整view的高度,以保证上边距和下边距不变

UIViewAutoresizingFlexibleBottomMargin

自动调整view与父视图的下边距,以保证上边距不变

 

 

 

 

 

 

 

 

 

注意:autoResizingMask 既可以在代码中直接使用,也可以在UIStoryboard中使用。

一个代码中使用autoResizingMask的例子:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    UIViewController *viewController = [[UIViewController alloc] init];    self.window.rootViewController = viewController;    self.window.backgroundColor = [UIColor whiteColor];        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20,100,200,100)];    [view setBackgroundColor:[UIColor grayColor]];    [self.window addSubview:view];        UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(20,20,50,50)];    [button setBackgroundColor:[UIColor whiteColor]];    [view addSubview:button];    //距离父视图右边距不变    //button.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;    //距离父视图的左边距不变    //button.autoresizingMask = UIViewAutoresizingFlexibleRightMargin;    //距离父视图的左右边距不变,button大小会调整    //button.autoresizingMask = UIViewAutoresizingFlexibleWidth;    //view.frame = CGRectMake(20,100,300,100);        //距离父视图的下边距不变    //button.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;    //距离父视图的上边距不变    //button.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin;    //距离父视图的上下边距不变,button大小会调整    button.autoresizingMask = UIViewAutoresizingFlexibleHeight;    view.frame = CGRectMake(20,100,200,200);        [self.window makeKeyAndVisible];    return YES;}

 

另外,autoResizingMask 可以组合使用。例如:

button.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin;

 

表示的是,子控件相对于父控件的顶部和右侧的距离不变。

iOS -- autoResizingMask使用(转)