iOS開發-UI從入門到精通(三)

2019-11-14 18:44:43

字體：大中小

來源：轉載

供稿：網友

iOS開發-UI 從入門到精通(三)是對 iOS開發-UI 從入門到精通(一)知識點的綜合練習，搭建一個簡單地登陸界面，增強實戰經驗，為以后做開發打下堅實的基礎！

※在這里我們還要強調一下，開發環境和內存管理注意事項（最后一次強調，以后文章中將不會在出現希望大家謹記）：

1、前期iOS-UI開發我們需要手動管理內存，所以我們要把ARC關掉（Xcode關掉ARC的步驟）；

（1）打開Xcode選中當前工程：

（2）選中Build Settings：

（3）在輸入框內輸入count：

（4）選擇Objective-C Automatic Reference Counting 將其設置為 NO：

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

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

2、在開發當中我們會用到模擬器下面我們來看一下模擬器添加步驟（Xcode環境下）；

（1）打開Xcode選擇Window下的Devices：

（2）點擊“+”在彈出來的選擇框里對 Simulator Name 進行選擇：

一、利用所學的知識搭建一個簡單地登陸界面界面呈現“賬號”、“密碼”、“登錄”、“忘記密碼”、“注冊”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--:創建一個view17     UIView * view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];18     19     view.backgroundColor = [UIColor whiteColor];20     21 #pragma mark--:創建兩個UILabel(賬號/密碼)22     UILabel * numLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 100, 50, 30)];23     24     numLabel.text = @"賬  號:";25     26     UILabel * passLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 160, 50, 30)];27     28     passLabel.text = @"密  碼:";29     30 #pragma mark--:創建兩個UITextField(賬號輸入框/密碼輸入框)31     UITextField * numTextField = [[UITextField alloc] initWithFrame:CGRectMake(130, 100, 200, 30)];32     33     numTextField.borderStyle = UITextBorderStyleRoundedRect;34     35     numTextField.placeholder = @"請輸入手機號/郵箱";36     37     UITextField * passTextField = [[UITextField alloc] initWithFrame:CGRectMake(130, 160, 200, 30)];38     39     passTextField.borderStyle = UITextBorderStyleRoundedRect;40     41     passTextField.placeholder = @"請輸入密碼";42     43 #pragma mark--:創建三個Button(登錄/忘記密碼/注冊)44     UIButton * loginBtn = [UIButton buttonWithType:UIButtonTypeSystem];45     46     loginBtn.frame = CGRectMake(60, 220, 40, 40);47     48     [loginBtn setTitle:@"登錄" forState:UIControlStateNormal];49     50     UIButton * forgetBtn = [UIButton buttonWithType:UIButtonTypeSystem];51     52     forgetBtn.frame = CGRectMake(160, 220, 60, 40);53     54     [forgetBtn setTitle:@"忘記密碼" forState:UIControlStateNormal];55     56     UIButton * regisBtn = [UIButton buttonWithType:UIButtonTypeSystem];57     58     regisBtn.frame = CGRectMake(280, 220, 40, 40);59     60     [regisBtn setTitle:@"注冊" forState:UIControlStateNormal];61     62 #pragma mark--:添加到視圖上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--:釋放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