UItextField通常用于外部数据输入，以实现人机交互。下面以一个简单的登陆界面来讲解UItextField的详细使用。
／／用来显示“用户名”的label
UILabel* label1 = [[UILabelalloc] initWithFrame:CGRectMake(15, 65, 70, 30)];
label1.backgroundColor = [UIColorclearColor];
label1.font = [UIFontfontWithName:@"Helvetica-Bold"size:18];
label1.text = @"用户名";
label1.textColor = [UIColorwhiteColor];
[view1 addSubview:label1];
[label1 release];
UITextField ＊ accountField = [[UITextField alloc] initWithFrame:CGRectMake(85.0f, 60.0f, 190.0f, 40.0f)];
[accountField setBorderStyle:UITextBorderStyleRoundedRect]; //外框类型
accountField.placeholder = @"用户名"; //默认显示的字
accountField.secureTextEntry = NO; //是否以密码形式显示
accountField.autocorrectionType = UITextAutocorrectionTypeNo;／／设置是否启动自动提醒更正功能
accountField.autocapitalizationType = UITextAutocapitalizationTypeNone;
accountField.returnKeyType = UIReturnKeyDone; ／／键盘返回类型
accountField.clearButtonMode = UITextFieldViewModeWhileEditing; //编辑时会出现个修改X
accountField.delegate = self;
accountField.keyboardType = UIKeyboardTypeDefault;／／键盘显示类型
accountField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; ／／设置居中输入
accountField.scrollEnabled = YES;//是否可以拖动
accountField.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度
／／用来显示“密码”的label
UILabel* label2 = [[UILabelalloc] initWithFrame:CGRectMake(15, 120, 70, 30)];
label2.backgroundColor = [UIColorclearColor];
label2.font = [UIFontfontWithName:@"Helvetica-Bold"size:18];
label2.text = @"密码";
label2.textColor = [UIColorwhiteColor];
[view1 addSubview:label2];
[label2 release];
UITextField* passwdField = [[UITextField alloc] initWithFrame:CGRectMake(85.0f, 115.0f, 190.0f, 40.0f)];
[passwdFieldsetBorderStyle:UITextBorderStyleRoundedRect]; //外框类型
//passwdField.placeholder = @"密码"; //默认显示的字
passwdField.secureTextEntry = YES; //密码类型
passwdField.autocorrectionType = UITextAutocorrectionTypeNo;
passwdField.autocapitalizationType = UITextAutocapitalizationTypeNone;
passwdField.returnKeyType = UIReturnKeyDone;
passwdField.clearButtonMode = UITextFieldViewModeWhileEditing; //编辑时会出现个修改X
passwdField.delegate = self;
// passwdField.keyboardAppearance = UIKeyboardAppearanceDefault;
passwdField.keyboardType = UIKeyboardTypeNumbersAndPunctuation;
passwdField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
委托方法
-(void)textFieldDidBeginEditing:(UITextField *)textField;
//当开始点击textField会调用的方法
-(void)textFieldDidEndEditing:(UITextField *)textField;
//当textField编辑结束时调用的方法
//按下Done按钮的调用方法，我们让键盘消失
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
｝
