////  ViewController.m//  06-UIView的常见属性//#import "ViewController.h"@interface ViewController ()// 绿色的view@property (weak, nonatomic) IBOutlet UIView *greenView;/** 数组 */@property (nonatomic, strong) NSMutableArray *dataArr;@end@implementation ViewController- (void)loadView{  //加载控制器    [super loadView];    NSLog(@"%s", __func__);}/**   1. 系统调用   2. 控制器的view加载完毕的时候调用   3. 控件的初始化,数据的初始化(懒加载) */- (void)viewDidLoad {    [super viewDidLoad];       // 1.1 查看绿色的view的父控件，self是控制器，    NSLog(@"绿色的view的父控件:%@----控制器的view:%@", self.greenView.superview, self.view);//UIView        // 1.2 查看绿色的view的子控件    NSLog(@"%@", self.greenView.subviews);//UIButton,UILabel        // 1.3 控制器的view的子控件    NSLog(@"%@", self.view.subviews);//UILabel,UIButton,UIView        // 1.4 控制器的view的父控件 --> UIWindow    NSLog(@"viewDidLoad-----%@", self.view.superview);//null}- (void)viewDidAppear:(BOOL)animated{ //view已经出现    [super viewDidAppear:animated];    NSLog(@"viewDidAppear-----%@", self.view.superview);//UIWindow}/**   1. 系统调用   2. 当控制器接收到内存警告调用   3. 去除一些不必要的内存,去除耗时的内存 */- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];       self.dataArr = nil;}/** *  模拟内存警告--->不断增加内存 */- (void)test{    NSMutableArray *arr = [NSMutableArray array];    for (int i=0; i<100000000; i++) {        UILabel *label = [[UILabel alloc] init];        [arr addObject:label];    }    self.dataArr = arr;}@end