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QQ登录界面01

  目的：设计一个登录界面并实现登录功能

 完成任务：1.熟悉UIButton、UILabel、UITextField的各种属性和应用；

           2.动态创建控件，实现事件功能

           3.掌握plist文件的读写

           4.使用模态视图实现页面跳转

 代码如下：

<strong><span style="font-size:18px;color:#006600;">//  ViewContronller.m
//  QQLogin
//  Created by mac on 15-10-21.
//  Copyright (c) 2015年 mac. All rights reserved.#import "NextViewController.h"
@interface ViewController ()
{UITextField *usernumber;UITextField *password;}
@end</span></strong>
<strong><span style="font-size:18px;color:#006600;">@implementation ViewController
- (void)viewDidLoad {[super viewDidLoad];[self initViews];[self plistMethod];// Do any additional setup after loading the view, typically from a nib.
}</span></strong>
<strong><span style="font-size:18px;color:#006600;">(void)initViews {UILabel *Userlab = [[UILabel alloc] initWithFrame:CGRectMake(30,100,70,30)];[Userlab setText:@"账号"];[Userlab setTextColor:[UIColor blueColor]];[Userlab setBackgroundColor:[UIColor clearColor]];[self.view addSubview:Userlab];UILabel *Passwordlab = [[UILabel alloc] initWithFrame:CGRectMake(30,140,70,30)];[Passwordlab setText:@"密码"];[Passwordlab setTextColor:[UIColor blueColor]];[Userlab setBackgroundColor:[UIColor clearColor]];[self.view addSubview:Passwordlab];usernumber = [[UITextField alloc] initWithFrame:CGRectMake(120,100 , 150, 30)];usernumber.placeholder=@"请输入账号";usernumber.clearButtonMode=UITextFieldViewModeWhileEditing;usernumber.borderStyle = UITextBorderStyleRoundedRect;[self.view addSubview:usernumber];password = [[UITextField alloc] initWithFrame:CGRectMake(120, 140, 150, 30)];password.placeholder=@"请输入密码";password.clearButtonMode=UITextFieldViewModeWhileEditing;password.borderStyle = UITextBorderStyleRoundedRect;password.secureTextEntry=YES;[self.view addSubview:password];UIButton *Registerbtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];[Registerbtn setFrame:CGRectMake(90, 180, 150, 40)];[Registerbtn setTitle:@"注册" forState:UIControlStateNormal];[Registerbtn addTarget:self action:@selector(clickRegister:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:Registerbtn];UIButton *Loginbtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];[Loginbtn setFrame:CGRectMake(150, 180, 150, 40)];[Loginbtn setTitle:@"登录" forState:UIControlStateNormal];[Loginbtn addTarget:self action:@selector(clickLogin:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:Loginbtn];<pre name="code" class="objc">    }
-(NSString *)plistMethod{//获取本地沙盒路径NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *Path = [paths objectAtIndex:0];//获取完整的文件名NSString *filename = [Path stringByAppendingPathComponent:@"messages.plist"];return filename;
}
<span style="font-family: Arial, Helvetica, sans-serif;">-(void)clickRegister:(UIButton *) sender{</span></span></strong>
<strong><span style="font-size:18px;color:#006600;">    //创建一个可变数组NSMutableArray，用来存放从文本框中获取的数据NSMutableArray *array=[[NSMutableArray alloc]init];[array addObject:usernumber.text];[array addObject:password.text];[array writeToFile:[self plistMethod] atomically:YES];//检查是否写入NSMutableArray *writeData=[[NSMutableArray alloc]initWithContentsOfFile:[self plistMethod]];NSLog(@"write data is:%@",writeData);}</span></strong>
<strong><span style="font-size:18px;color:#006600;"><span style="font-family:KaiTi_GB2312;font-size:18px;"><strong>(void)clickLogin:(UIButton *)sender{//设置文件管理器NSFileManager *manage=[NSFileManager defaultManager];if ([manage fileExistsAtPath:[self plistMethod]]) {NSMutableArray *array = [[NSMutableArray alloc]initWithContentsOfFile:[self plistMethod]];NextViewController *nextCtr = [[NextViewController alloc] init];UINavigationController *navCtr = [[UINavigationController alloc] initWithRootViewController:nextCtr];//模态视图[self presentViewController:navCtr animated:YES completion:nil];NSLog(@"%@", array);} else{NSLog(@"数据文件不存在！！！");}
}
- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{[usernumber resignFirstResponder];[password resignFirstResponder];
}</span></strong>
@end

  不足之处：1.未对注册和登录的具体事件进行判断处理

          2.只能够做到将一组数据写进plist文件当中，后面写入的数据会覆盖掉前面的数据
 结语：学习之—>行路难，行路难，多少缓水是险滩
 
 

 

 

 

 

 
            
            
            

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                                                QQ登录界面01
                                            


            

                

                    

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