20150701_UI之UIView自动布局

UIView的自动布局,改变父视图,子视图的大小也回随着变化

//
//  ViewController.m
//  IOS150701_UI(02)_UIView自动布局
//
//  Created by PengJunlong on 15/7/1.
//  Copyright (c) 2015年 Peng Junlong. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //自动布局
    CGFloat size = self.view.frame.size.width-300;
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(150, 200, size, size)];
    view.backgroundColor = [UIColor orangeColor];
    view.tag = 100;
    //打开子视图自动布局,随父视图布局的改变而改变
    view.autoresizesSubviews = YES;	//默认值是YES
    //自动剪裁,将子视图超出父视图的部分剪裁掉
    view.clipsToBounds = YES;
    [self.view addSubview:view];
    
    UIView *topView = [[UIView alloc] initWithFrame:CGRectMake(5, 5, size-10, size)];
    topView.backgroundColor = [UIColor greenColor];
    
    //这两个都要设置
    //@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
    
    //UIViewAutoresizingNone                 = 0,//就是不自动调整
    //    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,//自动调整与superView左边的距离，保证与superView右边的距离不变。
    //
    //    UIViewAutoresizingFlexibleWidth        = 1 << 1,//自动调整自己的宽度，保证与superView左边和右边的距离不变
    //    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,//自动调整与superView的右边距离，保证与superView左边的距离不变。
    //
    //    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,//自动调整与superView顶部的距离，保证与superView底部的距离不变。
    //    UIViewAutoresizingFlexibleHeight       = 1 << 4,//自动调整自己的高度，保证与superView顶部和底部的距离不变。
    //    UIViewAutoresizingFlexibleBottomMargin = 1 << 5//自动调整与superView底部的距离，也就是说，与superView顶部的距离不变。
    
    //设置子视图与父视图的四周距离都保持不变
    topView.autoresizingMask  = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
    [view addSubview:topView];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(100, 400, self.view.frame.size.width-200, 30);
    btn.backgroundColor = [UIColor cyanColor];
    [btn setTitle:@"点击" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}

- (void)btnClicked
{
    UIView *view = [self.view viewWithTag:100];
    CGRect frame = CGRectMake(view.frame.origin.x-1, view.frame.origin.y-1, view.frame.size.width+2, view.frame.size.height+2);
    view.frame = frame;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end