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IOS代码布局(三) UITextField

(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 

 

IOS代码布局(三) UITextField