UI控件之（TextField）

——————————————configureTextField——————————————————

placeholder  英文註解：佔位符;    //其實也就是佔了個地方而已，實際TextField是nil，默認顯示灰色字體。

autocorrectionType  自動校訂，當輸入內容有誤時，在鍵盤上會顯示校訂後的內容

returnKeyType 返回鍵的類型 ：一般有UIReturnKeySend,UIReturnKeySearch，

UIReturnKeyJoin等

clearButtonMode 清空輸入的字符：

     UITextFieldViewModeAlways，不爲空，得到焦點與沒有得到焦點都顯示清空按鈕

     UITextFieldViewModeNever,不顯示清空按鈕

     UITextFieldViewModeWhileEditing,不爲空，且在編輯狀態時（及得到焦點）顯示清空按鈕

     UITextFieldViewModeUnlessEditing, 不爲空，且不在編譯狀態時（焦點不在輸入框上）顯示清空按鈕

——————————configureTintedTextField（着色）——————————

- (void)configureTintedTextField {

    self.tintedTextField.tintColor = [UIColor aapl_applicationBlueColor];  //效果沒出來

    self.tintedTextField.textColor = [UIColor aapl_applicationGreenColor];

}

——————————configureSecureTextField（安全輸入）——————————

- (void)configureSecureTextField {

    self.secureTextField.secureTextEntry = YES;   //密碼輸入

}

——————————configureSpecificKeyboardTextField（鍵盤風格）——————————

- (void)configureSpecificKeyboardTextField {

    self.specificKeyboardTextField.keyboardType = UIKeyboardTypeEmailAddress;

}

——————————configureSpecificKeyboardTextField（自定義鍵盤）——————————

- (void)configureCustomTextField {

    // Text fields with custom image backgrounds must have no border.

    self.customTextField.borderStyle = UITextBorderStyleNone;

    

    self.customTextField.background = [UIImage imageNamed:@"text_field_background"];

    

    // Create a purple button that, when selected, turns the custom text field's text color to purple.

    UIImage *purpleImage = [UIImage imageNamed:@"text_field_purple_right_view"];

    UIButton *purpleImageButton = [UIButton buttonWithType:UIButtonTypeCustom];

    purpleImageButton.bounds = CGRectMake(0, 0, purpleImage.size.width, purpleImage.size.height);

    purpleImageButton.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 5);

    [purpleImageButton setImage:purpleImage forState:UIControlStateNormal];

    [purpleImageButton addTarget:self action:@selector(customTextFieldPurpleButtonClicked) forControlEvents:UIControlEventTouchUpInside];

    self.customTextField.rightView = purpleImageButton;

    self.customTextField.rightViewMode = UITextFieldViewModeAlways;

    // Add an empty view as the left view to ensure inset between the text and the bounding rectangle.

    UIView *leftPaddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 0)];

    leftPaddingView.backgroundColor = [UIColor clearColor];

    self.customTextField.leftView = leftPaddingView;

    self.customTextField.leftViewMode = UITextFieldViewModeAlways;

    self.customTextField.placeholder = NSLocalizedString(@"Placeholder text", nil);

    self.customTextField.autocorrectionType = UITextAutocorrectionTypeNo;

    self.customTextField.returnKeyType = UIReturnKeyDone;

}

#pragma mark - Actions

- (void)customTextFieldPurpleButtonClicked {

    self.customTextField.textColor = [UIColor aapl_applicationPurpleColor];

    NSLog(@"The custom text field's purple right view button was clicked.");

}

效果圖:

UITextFieldDelegate方法介紹：

#pragma mark - UITextFieldDelegate (set in Interface Builder)

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

    [textField resignFirstResponder];      //when 'return' key pressed 鍵盤右下角返回鍵盤按下時執行

    return YES;

}

// 設置輸入框，是否能夠被修改

// NO-將沒法修改，不出現鍵盤

// YES-能夠修改，默認值

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{

    return YES;

}

// 當輸入框得到焦點時，執行該方法。

- (void)textFieldDidBeginEditing:(UITextField *)textField{

    NSLog(@"textFieldDidBeginEditing");

}

// 指定是否容許文本字段結束編輯，容許的話，文本字段會失去first responder

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{

    return YES;

}

// 文本框失去first responder 時，執行

- (void)textFieldDidEndEditing:(UITextField *)textField{

    NSLog(@"textFieldDidEndEditing");

}

// 指明是否容許根據用戶請求清除內容

- (BOOL)textFieldShouldClear:(UITextField *)textField{

    NSLog(@"textFieldDidEndEditing");

    return YES;

}

// 文本框的文本，是否能被修改

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

    return YES;

}