iOS8 UIView之autoresizingMask 的使用

@property(nonatomic) BOOL autoresizesSubviews; // default is YES. if set, subviews are adjusted according to their autoresizingMask if self.bounds changes
@property(nonatomic) UIViewAutoresizing autoresizingMask;    // simple resize. default is UIViewAutoresizingNone

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
};

 1 #import "TestViewController.h"
 2 @interface TestViewController()
 3 @property (nonatomic,weak) UIView * superView;
 4 @end
 5 
 6 @implementation TestViewController
 7 -(void)loadView
 8 {
 9     [super loadView];
10     UIView * superView = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 100, 200)];
11     superView.backgroundColor = [UIColor redColor];
12     [self.view addSubview:superView];
13     self.view.backgroundColor = [UIColor whiteColor];
14     _superView = superView;
15     UIView * subView = [[UIView alloc] initWithFrame:CGRectMake(0, 20, 50, 40)];
16     superView.autoresizesSubviews = YES;
17     
18 //  1、设置subView随superView的bounds变化，上、下、左、右边距和宽高都随superView的变化而变化
19     subView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleWidth;
20 //  2、设置subView随superView的bounds变化，上、下、高都随superView的变化而变化，而左右边距和宽度不变
21     subView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin;
22 //  3、设置subView随superView的bounds变化，上边距和高都随superView的变化而变化，而下、左、右边距和宽度不变
23     subView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight;
24 //  4、单一属性一般不做此类设置（没看出到底什么效果）
25 //    subView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;
26 //  5、设置subView随superView的bounds变化，下边距和高都随superView的变化而变化，而上、左、右边距和宽度不变
27     subView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleBottomMargin;
28 //  6、设置subView随superView的bounds变化，左边距和宽都随superView的变化而变化，而上、下、右边距和高度不变
29     subView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleLeftMargin;
30 //  7、设置subView随superView的bounds变化，右边距和宽都随superView的变化而变化，而上、下、左边距和高度不变
31     subView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleRightMargin;
32 //  8、设置subView随superView的bounds变化，左、右边距和宽都随superView的变化而变化，而上、下边距和高度不变
33     subView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleLeftMargin;
34 
35     
36     subView.backgroundColor = [UIColor blackColor];
37     [superView addSubview:subView];
38     
39     UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 400,100,100)];
40     [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
41     [btn setTitle:@"点我" forState:UIControlStateNormal];
42     [btn setBackgroundColor:[UIColor grayColor]];
43     
44     [self.view addSubview:btn];
45 }
46 
47 -(void)click:(id)sender
48 {
49     _superView.frame = CGRectMake(50, 50, 200, 200);
50 }
51 @end