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AppDelegate.m

#import "AppDelegate.h"#import "RootViewController.h"@interface AppDelegate ()@end@implementation AppDelegate-(void)dealloc{    [_window release];    [super dealloc];}// 告诉主程序window已经创建完毕- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    // Override point for customization after application launch.    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    [_window release];    // 创建一个rootviewcontroller对象    RootViewController *rootVC=[[RootViewController alloc]init];    // 设置window根视图控制器    self.window.rootViewController=rootVC;    [rootVC release];    // 创建一个viewController时直接创建一个和屏幕一样大小的view     return YES;}

RootVIewController.m

#import "RootViewController.h"#import "LTVIew.h"#import "SecondViewController.h"#define HEIGHT  self.view.frame.size.height@interface RootViewController ()<UITextFieldDelegate>@property(nonatomic,retain)NSMutableArray *arr;@end@implementation RootViewController// 有一个初始化方法// vc 的初始化方法,这个方法一般我们自己就调用了,不需要我们再额外的去调用// 一般我们会用这个方法来初始化一些容器,比如数组,字典等-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        self.arr=[NSMutableArray array];// 创建一个空数组并且进行初始化    }    NSLog(@"%s",__FUNCTION__);// 会按照执行方法的顺序打印方法名      return self;}// 加载视图  view指的就是self.view-(void)loadView{   // 如果要重写父类的方法的话  先调用  用super调用父类的方法,保证原功能不变,接下来在super方法下面再写自己要新添加的方法    [super loadView];    NSLog(@"%s",__FUNCTION__);}#pragma mark   视图加载完成// 视图加载完成- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor=[UIColor yellowColor];    NSLog(@"%s",__FUNCTION__);    //视图的创建和铺设都在viewdidload方法里进行       // 铺3个textfield    // 给每个textfield都设置代理人    UITextField *textField1=[[UITextField alloc]initWithFrame:CGRectMake(100, 200, 150, 40)];    [self.view addSubview:textField1];    textField1.layer.borderWidth=1;    textField1.layer.borderColor=[UIColor redColor].CGColor;    textField1.layer.cornerRadius=10;    textField1.delegate=self;    [textField1 release];    UITextField *textField2=[[UITextField alloc]initWithFrame:CGRectMake(100, 300, 150, 40)];    [self.view addSubview:textField2];    textField2.layer.borderWidth=1;    textField2.layer.borderColor=[UIColor redColor].CGColor;    textField2.layer.cornerRadius=10;    textField2.delegate=self;    [textField2 release];    UITextField *textField3=[[UITextField alloc]initWithFrame:CGRectMake(100, 400, 150, 40)];    [self.view addSubview:textField3];    textField3.layer.borderWidth=1;    textField3.layer.borderColor=[UIColor redColor].CGColor;    textField3.layer.cornerRadius=10;    textField3.delegate=self;    [textField3 release];    // 铺一个button    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame=CGRectMake(100, 500, 150, 40);    [button setTitle:@"下一页" forState:UIControlStateNormal];    button.backgroundColor=[UIColor redColor];    [self.view addSubview:button];    button.layer.borderWidth=1;    button.layer.borderColor=[UIColor redColor].CGColor;    button.layer.cornerRadius=10;    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];    button.alpha=0.7;    }// 当虚拟键盘弹起挡住控件的时候,使view往上走-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    // 只要输入框被激活,就会触发这个方法    // 判断    if (textField.frame.origin.y > HEIGHT / 2) {        // 先做一个差值        CGFloat height = textField.frame.origin.y - HEIGHT / 2;        self.view.center = CGPointMake(self.view.center.x, self.view.center.y-height);    }    return YES;}// 等到编译结束的时候,再让他回到原位-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{    // 整个是在移动self.view,父视图的移动会让所有的子视图一同移动,而且相对父视图的坐标位置不会发生比那话,所以,可以沿用上一个方法的判断    if (textField.frame.origin.y > HEIGHT / 2) {        CGFloat height = textField.frame.origin.y - HEIGHT / 2;        self.view.center = CGPointMake(self.view.center.x, self.view.center.y + height);    }    NSLog(@"结束的时候会触发");    return YES;}// 随机改变背景颜色// RGB的范围255-(void)click:(UIButton *)button{  [UIColor clearColor];//    self.view.backgroundColor=[UIColor colorWithRed:arc4random()% 256 / 255.0 green:arc4random() % 256 / 255.0 blue:arc4random() % 256 / 255.0 alpha:0.3];     // 跳转到下一个ViewController    // 创建一个secondVC的对象    SecondViewController *secondVC=[[SecondViewController alloc]init];    // 设置一下跳转时候的动画效果       [secondVC setModalTransitionStyle:UIModalTransitionStylePartialCurl];       // 进行跳转    [self presentViewController:secondVC animated:YES completion:^{           }];    // 内存管理    [secondVC release];}//视图的创建和铺设都在viewdidload方法里进行// 铺3个textfield// 手动加警告#warning 这个方法是视图将要出现的意思// 视图将要出现-(void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];    NSLog(@"%s",__FUNCTION__);}// 视图已经出现-(void)viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];     NSLog(@"%s",__FUNCTION__);}// 视图将会消失-(void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:animated];     NSLog(@"%s",__FUNCTION__);}// 视图已经消失-(void)viewDidDisappear:(BOOL)animated{    [super viewDidDisappear:animated];     NSLog(@"%s",__FUNCTION__);}

LTView.h 和LTView.m的创建看上一篇博客