登陸註冊思想

import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad
  {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  //三個UILabel
  UILabel *nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60, 80, 37)];
  nameLabel.font = [UIFont systemFontOfSize:15];
  nameLabel.text = @"用 戶 名:";
  nameLabel.backgroundColor = [UIColor clearColor];
  nameLabel.textAlignment = NSTextAlignmentLeft;
  nameLabel.numberOfLines = 2; //用於設置UILabel中文本的行數
  [self.view addSubview:nameLabel];
  [nameLabel release];

  UILabel *newPasswordLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60+40, 80, 37)];
  newPasswordLabel.font = [UIFont systemFontOfSize:15];
  newPasswordLabel.text = @"密 碼：";
  newPasswordLabel.backgroundColor = [UIColor clearColor];
  newPasswordLabel.textAlignment = NSTextAlignmentLeft;
  [self.view addSubview:newPasswordLabel];
  [newPasswordLabel release];

  UILabel *oncePasswordLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 60+40*2, 80, 37)];
  oncePasswordLabel.font = [UIFont systemFontOfSize:15];
  oncePasswordLabel.text = @"確認密碼:";
  oncePasswordLabel.backgroundColor = [UIColor clearColor];
  oncePasswordLabel.textAlignment = NSTextAlignmentLeft;
  [self.view addSubview:oncePasswordLabel];
  [oncePasswordLabel release];

  //三個輸入框
  UITextField *nameTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60, 210, 30)];
  nameTextField.placeholder = @"請輸入用戶名";
  nameTextField.tag = 1;
  [nameTextField setSecureTextEntry:NO];
  nameTextField.font = [UIFont systemFontOfSize:14];
  nameTextField.delegate = self;
  nameTextField.backgroundColor = [UIColor clearColor];
  nameTextField.borderStyle = UITextBorderStyleRoundedRect;
  [self.view addSubview:nameTextField];
  [nameTextField release];

  UITextField *passwordTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60+40, 210, 30)];
  passwordTextField.placeholder = @"至少6位數字";
  passwordTextField.tag = 2;
  [passwordTextField setSecureTextEntry:YES];
  passwordTextField.font = [UIFont systemFontOfSize:14];
  passwordTextField.delegate = self;
  passwordTextField.backgroundColor = [UIColor clearColor];
  passwordTextField.borderStyle = UITextBorderStyleRoundedRect;
  passwordTextField.keyboardType = UIKeyboardTypeNumberPad;
  [self.view addSubview:passwordTextField];
  [passwordTextField release];

  UITextField *onceNewPasswordTextField = [[UITextField alloc]initWithFrame:CGRectMake(90, 60+40*2, 210, 30)];
  onceNewPasswordTextField.placeholder = @"請再次輸入密碼";
  onceNewPasswordTextField.tag = 3;
  onceNewPasswordTextField.font = [UIFont systemFontOfSize:14];
  [onceNewPasswordTextField setSecureTextEntry:YES];
  onceNewPasswordTextField.delegate = self;
  onceNewPasswordTextField.backgroundColor = [UIColor clearColor];
  onceNewPasswordTextField.borderStyle = UITextBorderStyleRoundedRect;
  onceNewPasswordTextField.keyboardType = UIKeyboardTypeNumberPad;
  [self.view addSubview:onceNewPasswordTextField];
  [onceNewPasswordTextField release];

  UIButton confirmButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  confirmButton.frame = CGRectMake(110, 60+403+20, 100, 37);
  [confirmButton setTitle:@"肯定" forState:UIControlStateNormal]; //正常情況下button顯示的標題
  [confirmButton setTitle:@"肯定" forState:UIControlStateHighlighted]; //高亮顯示時button的標題
  confirmButton.backgroundColor = [UIColor redColor];
  [confirmButton addTarget:self action:@selector(confirm:) forControlEvents:UIControlEventTouchUpInside];//button被按下又擡起後發生的事件
  //@selector能夠理解爲"選擇子"，selector是一個指針變量，相似於sender。 這裏是將method的方法指定給新建的這個confirmButton
  [self.view addSubview:confirmButton];
  }

//收回鍵盤

• (void)touchesBegan:(NSSet )touches withEvent:(UIEvent )event
  {
  for (int i = 0; i<4; i++) {
  UITextField textField = (UITextField)[self.view viewWithTag:1+i];
  [textField resignFirstResponder];
  }
  }

• (void)didReceiveMemoryWarning
  {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end

二.UILabel

　　UILabel繼承了UIView，它能夠設置UIView所支持的屬性。

UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 20.0, 200.0, 50.0)]; //設置Label的位置和大小
//設置顯示文字
label1.text = @"用戶名";
//設置字體:粗體，正常的是 SystemFontOfSize
label1.font = [UIFont boldSystemFontOfSize:20];
//設置文字顏色
label1.textColor = [UIColor orangeColor];
//設置文字位置
label1.textAlignment = UITextAlignmentRight;
label2.textAlignment = UITextAlignmentCenter;
//設置字體大小適應label寬度
label4.adjustsFontSizeToFitWidth = YES;
//設置label的行數
label5.numberOfLines = 2;
UIlabel.backgroudColor=[UIColor clearColor]; //能夠去掉背景色

//設置高亮
label6.highlighted = YES;
label6.highlightedTextColor = [UIColor orangeColor];
//設置陰影
label7.shadowColor = [UIColor redColor];
label7.shadowOffset = CGSizeMake(1.0,1.0);
//設置是否能與用戶進行交互
label7.userInteractionEnabled = YES;
//設置label中的文字是否可變，默認值是YES
label3.enabled = NO;
//設置文字過長時的顯示格式
label3.lineBreakMode = UILineBreakModeMiddleTruncation;//截去中間
// typedef enum {
// UILineBreakModeWordWrap = 0,
// UILineBreakModeCharacterWrap,
// UILineBreakModeClip,//截去多餘部分
// UILineBreakModeHeadTruncation,//截去頭部
// UILineBreakModeTailTruncation,//截去尾部
// UILineBreakModeMiddleTruncation,//截去中間
// } UILineBreakMode;

//若是adjustsFontSizeToFitWidth屬性設置爲YES，這個屬性就來控制文本基線的行爲
label4.baselineAdjustment = UIBaselineAdjustmentNone;
// typedef enum {
// UIBaselineAdjustmentAlignBaselines,
// UIBaselineAdjustmentAlignCenters,
// UIBaselineAdjustmentNone,
// } UIBaselineAdjustment;

　*********在處理密碼等隱私類的信息時，可能須要將輸入的信息隱藏一下。

//每輸入一個字符就變成點 ,用語密碼輸入
[passwordTextField setSecureTextEntry:YES];

也能夠設置文本框關聯的鍵盤，以下：

複製代碼
//設置鍵盤的樣式
text.keyboardType = UIKeyboardTypeNumberPad;
typedef enum {
UIKeyboardTypeDefault, 　 //默認鍵盤，支持全部字符
UIKeyboardTypeASCIICapable,　 //支持ASCII的默認鍵盤
UIKeyboardTypeNumbersAndPunctuation,　 //標準電話鍵盤，支持＋＊＃字符
UIKeyboardTypeURL, //URL鍵盤，支持.com按鈕 只支持URL字符
UIKeyboardTypeNumberPad, 　 //數字鍵盤
UIKeyboardTypePhonePad,　 　 //電話鍵盤
UIKeyboardTypeNamePhonePad, 　 //電話鍵盤，也支持輸入人名
UIKeyboardTypeEmailAddress, 　 //用於輸入電子 郵件地址的鍵盤
UIKeyboardTypeDecimalPad, 　 //數字鍵盤 有數字和小數點
UIKeyboardTypeTwitter, 　 //優化的鍵盤，方便輸入@、#字符
UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable,
} UIKeyboardType;

　　有時須要限制輸入文本的長度，這類操做也很是廣泛和重要。

//限制輸入文本的長度

• (BOOL)textField:(UITextField )textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString )string
  {
  if ([textField.text length] > MAXLENGTH)
  {
  textField.text = [textField.text substringToIndex:MAXLENGTH-1];
  return NO;
  }
  return YES;
  }
  四.UIButton

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
// 可以定義的button類型有如下6種，
// typedef enum {
// UIButtonTypeCustom = 0, 自定義風格
// UIButtonTypeRoundedRect, 圓角矩形
// UIButtonTypeDetailDisclosure, 藍色小箭頭按鈕，主要作詳細說明用
// UIButtonTypeInfoLight, 亮色感嘆號
// UIButtonTypeInfoDark, 暗色感嘆號
// UIButtonTypeContactAdd, 十字加號按鈕
// } UIButtonType;

//給定button在view上的位置
     button1.frame = CGRectMake(20, 20, 280, 20);

     //button背景色
     button1.backgroundColor = [UIColor clearColor];

     //設置button填充圖片
     //[button1 setImage:[UIImage imageNamed:@"btng.png"] forState:UIControlStateNormal];

     //設置button標題
     [button1 setTitle:@"點擊" forState:UIControlStateNormal];
     /* forState: 這個參數的做用是定義按鈕的文字或圖片在何種狀態下才會顯現*/
    //如下是幾種狀態
 //    enum {
 //        UIControlStateNormal       = 0,         常規狀態顯現
 //        UIControlStateHighlighted  = 1 << 0,    高亮狀態顯現
 //        UIControlStateDisabled     = 1 << 1,    禁用的狀態纔會顯現
 //        UIControlStateSelected     = 1 << 2,    選中狀態
 //        UIControlStateApplication  = 0x00FF0000, 當應用程序標誌時
 //        UIControlStateReserved     = 0xFF000000  爲內部框架預留，能夠無論他
 //    };

     /*
               * 默認狀況下，當按鈕高亮的狀況下，圖像的顏色會被畫深一點，若是這下面的這個屬性設置爲no，
               * 那麼能夠去掉這個功能
              */
     button1.adjustsImageWhenHighlighted = NO;
     /*跟上面的狀況同樣，默認狀況下，當按鈕禁用的時候，圖像會被畫得深一點，設置NO能夠取消設置*/
     button1.adjustsImageWhenDisabled = NO;
     /* 下面的這個屬性設置爲yes的狀態下，按鈕按下會發光*/
     button1.showsTouchWhenHighlighted = YES;

     /* 給button添加事件，事件有不少種，我會單獨開一篇博文介紹它們，下面這個時間的意思是
               按下按鈕，而且手指離開屏幕的時候觸發這個事件，跟web中的click事件同樣。
               觸發了這個事件之後，執行butClick:這個方法，addTarget:self 的意思是說，這個方法在本類中
               也能夠傳入其餘類的指針*/
     [button1 addTarget:self action:@selector(butClick:) forControlEvents:UIControlEventTouchUpInside];

     //顯示控件
     [self.view addSubview:button1];

單獨說明一下：

UIButton confirmButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
confirmButton.frame = CGRectMake(110, 60+403+20, 100, 37);
[confirmButton setTitle:@"肯定" forState:UIControlStateNormal]; //正常情況下button顯示的標題
[confirmButton setTitle:@"肯定" forState:UIControlStateHighlighted]; //高亮顯示時button的標題
confirmButton.backgroundColor = [UIColor redColor];
[confirmButton addTarget:self action:@selector(confirm:) forControlEvents:UIControlEventTouchUpInside];//button被按下又擡起後發生的事件
//@selector能夠理解爲"選擇子"，selector是一個指針變量，相似於sender。 這裏是將method的方法指定給新建的這個confirmButton
[self.view addSubview:confirmButton];

　　若要設置UIButton的背景圖片時：

UIButton confirmButton = [UIButton buttonWithType:UIButtonTypeCustom]; confirmButton.frame = CGRectMake(10, 60, 100, 40); UIImage nextStepImage = [UIImage imageNamed:@"app.png"]; UIImage *nextStepDownImage = [UIImage imageNamed:@"app.png"]; nextStepImage = [nextStepImage resizableImageWithCapInsets:UIEdgeInsetsMake(8, 8, 8, 8)]; nextStepDownImage = [nextStepDownImage resizableImageWithCapInsets:UIEdgeInsetsMake(8, 8, 8, 8)]; [confirmButton setBackgroundImage:nextStepImage forState:UIControlStateNormal]; [confirmButton setBackgroundImage:nextStepDownImage forState:UIControlStateHighlighted]; [confirmButton setTitle:@"肯定" forState:UIControlStateNormal]; [confirmButton addTarget:self action:@selector(confirm:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:confirmButton];