源码-0105-Autoresizing

Autoresizing

 代码形式

//
//  ViewController.m
//  05-Autoresizing

#import "ViewController.h"

@interface ViewController ()
/** 蓝色 */
@property (nonatomic, strong) UIView *blueView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIView *blueView = [[UIView alloc] init];
    blueView.backgroundColor = [UIColor blueColor];
    blueView.frame = CGRectMake(0, 0, 250, 250);
    [self.view addSubview:blueView];
    self.blueView = blueView;
    
    UIView *redView = [[UIView alloc] init];
    redView.backgroundColor = [UIColor redColor];
    redView.frame = CGRectMake(0, 150, 250, 100);
    redView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
    [blueView addSubview:redView];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGFloat w = 200 + arc4random_uniform(100);
    CGFloat h = 200 + arc4random_uniform(100);
    self.blueView.frame = CGRectMake(0, 0, w, h);
}
/**
 UIViewAutoresizingNone                 = 0,
 UIViewAutoresizingFlexibleLeftMargin   = 1 << 0, 距离父控件左边的间距是伸缩的（不固定的）
 UIViewAutoresizingFlexibleRightMargin  = 1 << 2, 距离父控件右边的间距是伸缩的（不固定的）
 UIViewAutoresizingFlexibleTopMargin    = 1 << 3, 距离父控件顶部的间距是伸缩的（不固定的）
 UIViewAutoresizingFlexibleBottomMargin = 1 << 5, 距离父控件底部的间距是伸缩的（不固定的）
 UIViewAutoresizingFlexibleWidth        = 1 << 1, 宽度跟随父控件的宽度进行自动伸缩
 UIViewAutoresizingFlexibleHeight       = 1 << 4, 高度跟随父控件的高度进行自动伸缩
 */
@end