UITextField

//1、
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(30, 100, 260, 40)];
    //2、
//    textField.backgroundColor = [UIColor redColor];
    
    //属性
    //设置文字颜色：textColor
    textField.textColor = [UIColor redColor];
    //边框状态：borderStyle
    /*
     1、UITextBorderStyleRoundedRect   圆角
     2、UITextBorderStyleLine          黑色直角边框
     3、UITextBorderStyleBezel         灰色直角边框
     4、UITextBorderStyleNone          无边框
     */
    textField.borderStyle = UITextBorderStyleRoundedRect;
    //文字水平对齐：textAlignment   默认左对齐
    textField.textAlignment = NSTextAlignmentLeft;
    //文字垂直对齐：contentVerticalAlignment    默认居中
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    //设置字号：font
    textField.font = [UIFont systemFontOfSize:20.0];
    //自适应文字大小:adjustsFontSizeToFitWidth
    textField.adjustsFontSizeToFitWidth = YES;
    //设置最小字号：minimumFontSize
    textField.minimumFontSize = 20.0;
    //默认文字：text
    textField.text = @"hello world”;
    //提示文字:placeholder
    textField.placeholder = @"请输入账号";
    //密文：secureTextEntry
    textField.secureTextEntry = NO;
    //输入框是否可用：enabled
    textField.enabled = YES;
    //return键的类型:returnKeyType
    /*
     1、UIReturnKeyDefault         return
     2、UIReturnKeyDone            Done
     3、UIReturnKeyEmergencyCall   EmergencyCall
     4、UIReturnKeyGoogle=UIReturnKeyYahoo=UIReturnKeySearch   Search
     5、UIReturnKeyJoin   Join
     .
     .
     .
     */
    textField.returnKeyType = UIReturnKeyJoin;
    //键盘类型：keyboardType
    /*
     1、UIKeyboardTypeDefault   数字，符号，中英文
     2、UIKeyboardTypeNumberPad   数字键盘
     3、UIKeyboardTypeWebSearch  网址  .
     4、UIKeyboardTypeURL     .com  /   .
     5、UIKeyboardTypeEmailAddress   @  .
     6、UIKeyboardTypeNumbersAndPunctuation   数字 符号
     .
     .
     .
     */
    textField.keyboardType = UIKeyboardTypeDefault;
    //键盘颜色:keyboardAppearance
    /*
     1、UIKeyboardAppearanceDefault=UIKeyboardAppearanceLight  浅灰色
     2、UIKeyboardAppearanceAlert=UIKeyboardAppearanceDark   深灰色
     */
    textField.keyboardAppearance = UIKeyboardAppearanceDefault;
    //背景图片：background    当边框状态为圆角时，背景图片无效
    textField.background = [UIImage imageNamed:@"map.png"];
    //一键清除按钮:clearButtonMode
    /*
     1、UITextFieldViewModeAlways         一直出现
     2、UITextFieldViewModeNever          永不出现
     3、UITextFieldViewModeWhileEditing   输入框编辑文字时出现，不编辑时消失
     4、UITextFieldViewModeUnlessEditing  输入框编辑文字时消失，不编辑时出现
     */
    textField.clearButtonMode = UITextFieldViewModeUnlessEditing;
    //再次编辑是否清空之前的文字：clearsOnBeginEditing   YES：清空
    textField.clearsOnBeginEditing = YES;
    //是否自动大写：autocapitalizationType
    /*
     1、UITextAutocapitalizationTypeAllCharacters   所有字母都大写
     2、UITextAutocapitalizationTypeNone    所有字母都不大写
     3、UITextAutocapitalizationTypeSentences   每个句子的首字母大写
     4、UITextAutocapitalizationTypeWords   每个单词的首字母大写
     */
    textField.autocapitalizationType = UITextAutocapitalizationTypeWords;
    //是否自动纠错：autocorrectionType
    /*
     1、UITextAutocorrectionTypeDefault   默认
     2、UITextAutocorrectionTypeNo   不纠错
     3、UITextAutocorrectionTypeYes   纠错
     */
    textField.autocorrectionType = UITextAutocorrectionTypeYes;
    //设置左视图:leftView
    //设置位置无效
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
    view.backgroundColor = [UIColor redColor];
    textField.leftView = view;
    //左视图出现状态:leftViewMode
    textField.leftViewMode = UITextFieldViewModeAlways;
    //设置右视图：rightView
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
    view2.backgroundColor = [UIColor yellowColor];
//    textField.rightView = view2;
    //右视图出现状态:rightViewMode
//    textField.rightViewMode = UITextFieldViewModeAlways;
    
    //不同的位置，不能用相同的view
    
    //键盘上面的view:inputAccessoryView
    UIView *view3 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 40)];
    view3.backgroundColor = [UIColor purpleColor];
    textField.inputAccessoryView = view3;
    
    //获取输入框里面的文字:textField.text
    NSString *str = textField.text;
    NSLog(@"%@",str);
    
    /**************!!!!!!delegate!!!!!!!*************/
    textField.delegate = self;
    
    [textField becomeFirstResponder];
    
    //3、
    [self.view addSubview:textField];


#pragma mark - UITextFieldDelegate
//return键的方法  *****
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    //输入框失去响应：键盘收回，光标消失
    [textField resignFirstResponder];
    
    //输入框开始响应：键盘出现，光标出现
//    [textField becomeFirstResponder];
    
    return YES;
}
//一键删除按钮的方法
- (BOOL)textFieldShouldClear:(UITextField *)textField{
    //返回YES：一键删除有效   返回NO：一键删除无效
    
    if ([textField.text isEqualToString:@"123"]) {
        return NO;
    }
    return YES;
}
//输入框是否可以开始编辑
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    return YES;
}
//输入框是否可以结束编辑   **
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
    if (textField.text.length < 11) {
        return NO;
    }
    return YES;
}
//输入框开始响应就调用的方法   ****
- (void)textFieldDidBeginEditing:(UITextField *)textField{
    NSLog(@"textFieldDidBeginEditing");
}
//输入框结束响应就调用的方法   ****
- (void)textFieldDidEndEditing:(UITextField *)textField{
    NSLog(@"textFieldDidEndEditing");
}

//页面跳转
    //第一个参数：即将跳转的页面
    //第二个参数：带不带动画效果
    //第三个参数：跳转结束后所做的操作
    
    //实例化第二个页面
    SecondViewController *second = [[SecondViewController alloc] init];
    //跳转的操作：从下向上出现
    [self presentViewController:second animated:YES completion:^{
        //
        NSLog(@"second");
    }];
    //返回上一页:从上向下消失
    [self dismissViewControllerAnimated:YES completion:^{
        //
    }];

//页面生命周期
//页面即将出现
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSLog(@"1");
}
//页面已经出现
- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    NSLog(@"2");
}
//页面即将消失
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    NSLog(@"3");
}
//页面已经消失
- (void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    NSLog(@"4");
}