MVC模式
MVC模式
MVC模式全称为model(模型)view(视图)controller(控制器),他分为三个不同的层分别负责不同的职责。
- View:该层用于存放视图,该层中我们可以对页面及控件进行布局。
- Model:模型一般都拥有很好的可复用性,在该层中,我们可以统一管理一些数据。
- Controlller:该层充当一个CPU的功能,即该应用程序所有的工作都由Controller统一管调控,他负责处理View和Model的事件。
MVC模式降低了各个环节耦合性,优化了Controller中的代码量。
MVC模式中各个层级之间的关系图 :
在这个图中,我们可以看出,Model层和View层之间并不会进行直接通信,他们之间是依靠Controller进行通信的。
流程:
点击view,视图响应事件,而后通过代理传递事件到Controller,发起网络请求更新model,model处理完数据,代理或通知给Controller,改变视图样式,完成操作。
MVC模式demo
这里我写了一个登陆注册的demo来学习MVC模式的具体使用。
下面展示我登陆界面的代码:
LandModel:
objectivec
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface LandModel : NSObject
@property (nonatomic, copy) NSMutableArray* arr1;
@property (nonatomic, copy) NSMutableArray* arr2;
-(void) InitArray;
@end
NS_ASSUME_NONNULL_END
objectivec
#import "LandModel.h"
@implementation LandModel
-(void) InitArray
{
_arr1 = [[NSMutableArray alloc] init];
_arr2 = [[NSMutableArray alloc] init];
}
@end
LandView:
objectivec
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface LandView : UIView
@property (nonatomic, retain) UITextField* textUser;
@property (nonatomic, retain) UITextField* textPassword;
@property (nonatomic, strong) UIButton* btn1;
@property (nonatomic, strong) UIButton* btn2;
-(void) InitButtonAndText;
@end
NS_ASSUME_NONNULL_END
objectivec
#import "LandView.h"
@implementation LandView
- (void)InitButtonAndText
{
self.textUser = [[UITextField alloc] initWithFrame:CGRectMake(50, 160, 300, 40)];
self.textUser.borderStyle = UITextBorderStyleRoundedRect; self.textUser.placeholder = @"请输入账号";
[self addSubview:self.textUser];
_textPassword = [[UITextField alloc] initWithFrame:CGRectMake(50, 230, 300, 40)];
self.textPassword.borderStyle = UITextBorderStyleRoundedRect;
self.textPassword.placeholder = @"请输入密码";
[self addSubview:self.textPassword];
_btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
_btn1.frame = CGRectMake(50, 350, 80, 50);
[_btn1 setTitle:@"登陆" forState:UIControlStateNormal];
_btn1.tintColor = [UIColor blackColor];
[self addSubview:_btn1];
_btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
_btn2.frame = CGRectMake(170, 350, 80, 50);
[_btn2 setTitle:@"注册" forState:UIControlStateNormal];
_btn2.tintColor = [UIColor blackColor];
[self addSubview:_btn2];
}
@end
ViewController:
objectivec
#import <UIKit/UIKit.h>
#import "LandModel.h"
#import "LandView.h"
#import "RegistViewController.h"
@interface ViewController : UIViewController<SendDelegate>
@property (nonatomic, strong) LandView* landview;
@property (nonatomic, strong) LandModel* landmodel;
@property (nonatomic, strong) RegistViewController* regist;
@property (nonatomic, retain) UIAlertController* alert;
@end
objectivec
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_landview = [[LandView alloc] init];
_landmodel = [[LandModel alloc] init];
[self.view addSubview:_landview];
[_landmodel InitArray];
[_landview InitButtonAndText];
[_landview.btn1 addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];
[_landview.btn2 addTarget:self action:@selector(regist1) forControlEvents:UIControlEventTouchUpInside];
}
-(void) login
{
for(int i = 0; i < _landmodel.arr1.count; i++) {
if([_landview.textUser.text isEqualToString:_landmodel.arr1[i]]&& [_landview.textPassword.text isEqualToString:_landmodel.arr2[i]]) {
self.alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"登陆成功" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
[self.alert addAction:confirmAction];
[self presentViewController:self.alert animated:YES completion:nil];
} else {
self.alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"用户名或密码错误" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
[self.alert addAction:confirmAction];
[self presentViewController:self.alert animated:YES completion:nil];
}
}
}
-(void) regist1
{
if(!_regist) {
_regist = [[RegistViewController alloc] init];
}
_regist.delegate = self;
[self presentViewController:_regist animated:YES completion:nil];
}
- (void)send:(NSMutableArray *)arruser password:(NSMutableArray *)password {
_landModel.arr1 = [NSMutableArray arrayWithArray:aarruser];
_landModel.arr2 = [NSMutableArray arrayWithArray:password];
}
@end