iOS开发-UI从入门到精通(三)

2019-11-14 18:44:43

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iOS开发-UI 从入门到精通(三)是对 iOS开发-UI 从入门到精通(一)知识点的综合练习，搭建一个简单地登陆界面，增强实战经验，为以后做开发打下坚实的基础！

※在这里我们还要强调一下，开发环境和内存管理注意事项（最后一次强调，以后文章中将不会在出现希望大家谨记）：

1、前期iOS-UI开发我们需要手动管理内存，所以我们要把ARC关掉（Xcode关掉ARC的步骤）；

（1）打开Xcode选中当前工程：

（2）选中Build Settings：

（3）在输入框内输入count：

（4）选择Objective-C Automatic Reference Counting 将其设置为 NO：

(5)AppDelegate.h文件中将：@PRoperty (assign, nonatomic) UIWindow *window;改成@property (retain, nonatomic) UIWindow *window;

(6)AppDelegate.m文件中重写：- (void)dealloc　　{　　[_window release];　　[super dealloc];　　}

2、在开发当中我们会用到模拟器下面我们来看一下模拟器添加步骤（Xcode环境下）；

（1）打开Xcode选择Window下的Devices：

（2）点击“+”在弹出来的选择框里对 Simulator Name 进行选择：

一、利用所学的知识搭建一个简单地登陆界面界面呈现“账号”、“密码”、“登录”、“忘记密码”、“注册”等：

AppDelegate.h文件中：

1 #import <UIKit/UIKit.h>2 3 @interface AppDelegate : UIResponder <UIapplicationDelegate>4 5 @property (retain, nonatomic) UIWindow *window;6 7 @end

AppDelegate.m文件中：

 1 @implementation AppDelegate 2  3 - (void)dealloc 4 { 5     [_window release]; 6     [super dealloc]; 7 } 8  9 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {10     // Override point for customization after application launch.11 #pragma mark--:window窗口12     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];13     14     _window.backgroundColor = [UIColor whiteColor];15     16 #pragma mark--:创建一个view17     UIView * view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];18     19     view.backgroundColor = [UIColor whiteColor];20     21 #pragma mark--:创建两个UILabel(账号/密码)22     UILabel * numLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 100, 50, 30)];23     24     numLabel.text = @"账  号:";25     26     UILabel * passLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 160, 50, 30)];27     28     passLabel.text = @"密  码:";29     30 #pragma mark--:创建两个UITextField(账号输入框/密码输入框)31     UITextField * numTextField = [[UITextField alloc] initWithFrame:CGRectMake(130, 100, 200, 30)];32     33     numTextField.borderStyle = UITextBorderStyleRoundedRect;34     35     numTextField.placeholder = @"请输入手机号/邮箱";36     37     UITextField * passTextField = [[UITextField alloc] initWithFrame:CGRectMake(130, 160, 200, 30)];38     39     passTextField.borderStyle = UITextBorderStyleRoundedRect;40     41     passTextField.placeholder = @"请输入密码";42     43 #pragma mark--:创建三个Button(登录/忘记密码/注册)44     UIButton * loginBtn = [UIButton buttonWithType:UIButtonTypeSystem];45     46     loginBtn.frame = CGRectMake(60, 220, 40, 40);47     48     [loginBtn setTitle:@"登录" forState:UIControlStateNormal];49     50     UIButton * forgetBtn = [UIButton buttonWithType:UIButtonTypeSystem];51     52     forgetBtn.frame = CGRectMake(160, 220, 60, 40);53     54     [forgetBtn setTitle:@"忘记密码" forState:UIControlStateNormal];55     56     UIButton * regisBtn = [UIButton buttonWithType:UIButtonTypeSystem];57     58     regisBtn.frame = CGRectMake(280, 220, 40, 40);59     60     [regisBtn setTitle:@"注册" forState:UIControlStateNormal];61     62 #pragma mark--:添加到视图上63     [view addSubview:regisBtn];64     65     [view addSubview:forgetBtn];66     67     [view addSubview:loginBtn];68     69     [view addSubview:passTextField];70     71     [view addSubview:numTextField];72     73     [view addSubview:passLabel];74     75     [view addSubview:numLabel];76     77     [_window addSubview:view];78     79     [_window makeKeyAndVisible];80     81 #pragma mark--:释放82     [passTextField release];83     84     [numTextField release];85     86     [passLabel release];87     88     [numLabel release];89     90     [view release];91     92     [_window release];93 94     return YES;95 }96 97 @end