UIView 子view跟随父view动态变化

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- (void)viewDidLoad {[super viewDidLoad];CGRect frame = [[UIScreen mainScreen] bounds];UIView *view1 = [[UIView alloc]init];view1.frame = CGRectMake(100, 100, 100, 100);view1.backgroundColor = [UIColor blackColor];//允许子视图自适应view1.tag = 100;view1.autoresizesSubviews = YES;[self.view addSubview:view1];UIView *view2 = [[UIView alloc]init];view2.frame = CGRectMake(25, 25, 50, 50);view2.backgroundColor = [UIColor whiteColor];//设置子视图适应方式view2.autoresizingMask =UIViewAutoresizingFlexibleLeftMargin   |UIViewAutoresizingFlexibleWidth        |UIViewAutoresizingFlexibleRightMargin  |UIViewAutoresizingFlexibleTopMargin    |UIViewAutoresizingFlexibleHeight       |UIViewAutoresizingFlexibleBottomMargin ;[view1 addSubview:view2];UIButton *btn = [[UIButton alloc]init];btn.frame = CGRectMake(0, frame.size.height-200, 50, 50);btn.backgroundColor = [UIColor grayColor];[btn setTitle:@"变化" forState:UIControlStateNormal];[btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];
}-(void)click:(UIButton *)btn{UIView *view1 =  [self.view viewWithTag:100];CGRect frame = view1.frame;view1.frame = CGRectMake(frame.origin.x-20, frame.origin.y-20, frame.size.width+40, frame.size.height+40);
}

UIView的视图自适应

父级view1中，包含一个view2，view1的大小变化时，view2可以根据设定条件，与view1一同变化：

view1先设置属性，使子view可以动态改变大小：

view1.autoresizesSubviews =YES;

view2子控件设置autoresizeingMask属性，来决定父view变化，子view做出怎样相应的变化：

view2.autoresizingMask =

UIViewAutoresizingFlexibleLeftMargin |

UIViewAutoresizingFlexibleWidth |

UIViewAutoresizingFlexibleRightMargin |

UIViewAutoresizingFlexibleTopMargin |

UIViewAutoresizingFlexibleHeight |

UIViewAutoresizingFlexibleBottomMargin ;