UI03_视图控制器

AppDelegate.h

LTView.h

#import <UIKit/UIKit.h>

@interface LTView : UIView<UITextFieldDelegate>
//  因为LTView里的label和textfield需要在外面设置一些内容, 所以需要在.h文件里把他们设置成属性
@property(nonatomic, retain)UILabel *myLabel;
@property(nonatomic, retain)UITextField *myTextfield;

@end

LTView.m

#import "LTView.h"

@implementation LTView

//  重写initWithFrame
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
//  创建label和textfield
[self createView];
}
return self;
}
- (void)createView {
self.myLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 150, 50)];
self.myLabel.layer.borderWidth = 1;
self.myLabel.layer.cornerRadius = 10;
//  把label贴在LTView上
[self addSubview:self.myLabel];
[_myLabel release];

//  textField
self.myTextfield = [[UITextField alloc] initWithFrame:CGRectMake(180, 20, 150, 50)];
self.myTextfield.layer.cornerRadius = 10;
self.myTextfield.layer.borderWidth = 1;
[self addSubview:self.myTextfield];
[_myTextfield release];
self.myTextfield.clearButtonMode = UITextFieldViewModeAlways;

//  点击return回收键盘
self.myTextfield.delegate = self;

}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[self.myTextfield resignFirstResponder];
return YES;
}

//  别忘了给属性执行dealloc方法
- (void)dealloc {
[_myTextfield release];
[_myLabel release];
[super dealloc];
}

@end

Appdelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

AppDelegate.m

#import "AppDelegate.h"
#import "RootViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate
-(void)dealloc {
[_window release];
[super dealloc];
}

- (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];
//  创建一个视图控制器对象
RootViewController *rootVC = [[RootViewController alloc] init];
//  设置根视图控制器
self.window.rootViewController = rootVC;
//  释放
[rootVC release];

return YES;
}

RootViewController.h

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

RootViewController.m

#import "RootViewController.h"
#import "SecondViewController.h"
#import "LTView.h"
//  宏定义
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height

@interface RootViewController ()<UITextFieldDelegate>

@end

@implementation RootViewController
#pragma mark    这个方法自动的执行, 不需要任何的调用, 我们会在这个方法里初始化一些容器, 比如: 数组, 字典
-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
NSLog(@"%s", __FUNCTION__);
}
return self;
}

- (void)loadView {
[super loadView];
NSLog(@"%s", __FUNCTION__);
//  加载了self.view
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor yellowColor];
NSLog(@"%g, %g", WIDTH, HEIGHT);
NSLog(@"%s", __FUNCTION__);

UITextField *firstTextField = [[UITextField alloc] initWithFrame:CGRectMake(100, 300, 150, 50)];
firstTextField.layer.borderWidth = 1;
firstTextField.layer.cornerRadius = 10;
[self.view addSubview:firstTextField];
[firstTextField release];
//    firstTextField.delegate = self;

UITextField *secondTextField = [[UITextField alloc] initWithFrame:CGRectMake(100, 400, 150, 50)];
secondTextField.layer.borderWidth = 1;
secondTextField.layer.cornerRadius = 10;
[self.view addSubview:secondTextField];
[secondTextField release];
//  设置代理人
secondTextField.delegate = self;
//  清除按钮的样式
secondTextField.clearButtonMode = UITextFieldViewModeAlways;

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
[button setTitle:@"下一页" forState:UIControlStateNormal];
button.layer.cornerRadius = 10;
button.layer.borderWidth = 1;
[self.view addSubview:button];
[button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
button.frame = CGRectMake(100, 500, 100, 50);

//  LTView对象
LTView *ltView = [[LTView alloc] initWithFrame:CGRectMake(5, 5, WIDTH, 200)];
ltView.backgroundColor = [UIColor redColor];
[self.view addSubview:ltView];
[ltView release];

}
- (void)click:(UIButton *)button {
SecondViewController *secVC = [[SecondViewController alloc] init];
//  设置模态跳转的动画效果
[secVC setModalTransitionStyle:UIModalTransitionStylePartialCurl];
[self presentViewController:secVC animated:YES completion:^{

}];
//  内存
[secVC release];
}

#pragma mark    点击清除按钮会触发这个协议方法
- (BOOL)textFieldShouldClear:(UITextField *)textField {
NSLog(@"内容清除");
return YES;
}

#pragma mark    输入框开始编辑
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
if (textField.frame.origin.y > HEIGHT / 2) {
//  计算当前textfield距离屏幕中心的距离
CGFloat height = textField.frame.origin.y - HEIGHT / 2;
self.view.center = CGPointMake(self.view.center.x, self.view.center.y - height);
}
return YES;
}
#pragma mark    结束编辑的时候执行这个方法
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
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);
}
return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSLog(@"textfield:%@", textField.text);
NSLog(@"string:%@", string);

return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}

#pragma mark    视图将要出现
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSLog(@"%s", __FUNCTION__);
}
#pragma mark    视图已经出现
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(@"%s", __FUNCTION__);
}
#pragma mark    视图将要消失
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
NSLog(@"%s", __FUNCTION__);
}
#pragma mark    视图已经消失
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
NSLog(@"%s", __FUNCTION__);
}
#warning 视图控制器从初始化方法开始执行, 然后是loadview, 初始化一个和屏幕等大的view, 接下来是viewDidLoad, 这个方法里我们写视图控件的创建, 然后是viewWillAppear, viewDidAppear, 视图控制器消失的时候会执行viewWillDisappear和viewDidDisappear
#warning 前三个方法只会执行一次, 而视图消失和出现只要状态符合, 就会执行

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
//  内存警告的方法
NSLog(@"%s", __FUNCTION__);
NSLog(@"内存警告");
}

SecondViewController.h

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@end

SecondViewController.h

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
[button setTitle:@"返回" forState:UIControlStateNormal];
button.layer.cornerRadius = 10;
button.layer.borderWidth = 1;
[self.view addSubview:button];
[button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
button.frame = CGRectMake(100, 500, 100, 50);

}
- (void)click:(UIButton *)button {
//  返回上一页
[self dismissViewControllerAnimated:YES completion:^{

}];
}