iOS開發之UITextField

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UITextField基本知識

UITextField展示的是一些可編輯的內容，並且與使用者有一些互動。比如當你在虛擬鍵盤上按下return鍵時，一般會關聯到鍵盤隱藏事件上。UITextField的一些狀態大多在UITextFieldDelegate協議中有相應的方法。

UITextField的初始化及一些屬性

```objc

//姓名輸入欄位UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(30, 30, 200, 44)];nameField.tag = 100;nameField.delegate = self;//預設文字nameField.placeholder = @"name";nameField.font = [UIFont systemFontOfSize:16.0f];nameField.textColor = [UIColor blackColor];//輸入框的背景圖片(還可以選擇設定背景顏色)nameField.background = [UIImage imageNamed:@"textFieldBackgroundImage"];//nameField.backgroundColor = [UIColor lightGrayColor];//清除按鈕nameField.clearButtonMode = UITextFieldViewModeAlways;//鍵盤類型nameField.keyboardType = UIKeyboardTypeDefault;[self.view addSubview:nameField];電話輸入欄位UITextField *phoneField = [[UITextField alloc] initWithFrame:CGRectMake(30, nameField.frame.origin.y + nameField.bounds.size.height+10, 200, 44)];phoneField.tag = 101;phoneField.delegate = self;phoneField.placeholder = @"phone";phoneField.keyboardType = UIKeyboardTypeDecimalPad;phoneField.clearButtonMode = UITextFieldViewModeAlways;[self.view addSubview:phoneField];//郵箱輸入欄位UITextField *emailField = [[UITextField alloc] initWithFrame:CGRectMake(30, phoneField.frame.origin.y + phoneField.bounds.size.height + 10, 200, 44)];emailField.tag = 102;emailField.delegate = self;emailField.placeholder = @"email";emailField.keyboardType = UIKeyboardTypeEmailAddress;emailField.clearButtonMode = UITextFieldViewModeAlways;[self.view addSubview:emailField];  

```

UITextField隱藏鍵盤

1.點擊鍵盤的return來隱藏鍵盤

這個方法需要在相應的.h檔案檔案中實現UITextFieldDelegate協議。並在.m檔案中添加如下方法

```objc

• (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return YES; }

```

2.點擊介面空白處來隱藏鍵盤

這個方法的實現主要是給當前的view增加點擊事件，並未點擊事件增加相應的處理方法，此處是為了隱藏鍵盤，所以我們可以在點擊事件對應的方法中讓UITextField放棄第一響應者。

```objc

• (void)dismissKeyboard { NSArray *subViews = [self.view subviews]; for (id inputText in subViews) { if ([inputText isKindOfClass:[UITextField class]]) { if ([inputText isFirstResponder]) { [inputText resignFirstResponder]; } } } }

```

為當前的view增加點擊事件

```objc

UITapGestureRecognizer *dismissKeyboardTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)]; [self.view addGestureRecognizer: dismissKeyboardTap];

```

UITextField－－為內容增加校正

```objc

• (BOOL)textFieldShouldEndEditing:(UITextField *)textField { switch (textField.tag) { case 100://name { NSLog(@"this is nameField"); //添加校正name的代碼 break; } case 101://phone { NSLog(@"this is phoneField"); //添加校正phone的代碼 break; } case 102://email { NSLog(@"this is emailField"); //添加校正email的代碼 break; }
  default: break; } return YES; }

```