UITextField基本知識

UITextField展示的是一些可編輯的內(nèi)容，并且與用戶有一些交互。比如當(dāng)你在虛擬鍵盤上按下return鍵時，一般會關(guān)聯(lián)到鍵盤隱藏事件上。UITextField的一些狀態(tài)大多在UITextFieldDelegate協(xié)議中有相應(yīng)的方法。

UITextField的初始化及一些屬性

	//姓名輸入域	UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(30, 30, 200, 44)];	nameField.tag = 100;    nameField.delegate = self;    //默認(rèn)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(shè)置背景顏色)    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];    電話輸入域    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];    //郵箱輸入域    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(diǎn)擊鍵盤的return來隱藏鍵盤

這個方法需要在相應(yīng)的.h文件文件中實(shí)現(xiàn)UITextFieldDelegate協(xié)議。并在.m文件中添加如下方法

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

2.點(diǎn)擊界面空白處來隱藏鍵盤

這個方法的實(shí)現(xiàn)主要是給當(dāng)前的view增加點(diǎn)擊事件，并未點(diǎn)擊事件增加相應(yīng)的處理方法，此處是為了隱藏鍵盤，所以我們可以在點(diǎn)擊事件對應(yīng)的方法中讓UITextField放棄第一響應(yīng)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(dāng)前的view增加點(diǎn)擊事件

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

UITextField－－為內(nèi)容增加校驗(yàn)

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