iOS開發之UITextField

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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

//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

- (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。

- (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

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

UITextField－－為內容增加校正

- (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;}