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（一）常规操作
1.定义一个UITextField，名为textField：
UITextField *textField = = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 200, 40)];
2.设置背景颜色
textField.backgroundColor = [UIColor colorWithRed:0.5 green:0.5 blue:0 alpha:0.5];
3.??????设置边框类型
textField.borderStyle = UITextBorderStyleRoundedRect;
4.设置背景图片
textField???.background = [UIImage imageNamed:@""];
5.设置委托对象
textField.delegate = self;
6.设置默认提示文字
textField.placeholder = @"请输入文字";
7.弹出键盘（变成第一响应者）
[textField becomeFirstResponder];
8.文字内容 垂直居中
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
（二）委托设置
1.在声明中引入委托名（ ViewController.m中）
@interface ViewController ()<UITextFieldDelegate/*这里引入UITextField 需要的委托*/>{ //在这里声明全局 私有变量 UITextField *textField; }
2.设置委托对象
textField.delegate = self;
3.实现委托方法
//以下是UITextFieldDelegate 的部分委托实现 //******************************************************************************* #pragma mark ------------------- #pragma mark UITextFieldDelegate - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{ // return NO to disallow editing. return YES; } - (void)textFieldDidBeginEditing:(UITextField *)textField{ // became first responder // 在这里监听UITextField becomeFirstResponder事件 } - (BOOL)textFieldShouldEndEditing:(UITextField *)textField{ // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end return YES; } - (void)textFieldDidEndEditing:(UITextField *)textField{ // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called // 在这里监听UITextField resignFirstResponder事件 } - (BOOL)textField:(UITextField *)_textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ // return NO to not change text NSLog(@"inputText: %@", textField.text); return
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原文地址：http://www.cnblogs.com/Asssjc/p/5863133.html
