UITextField使用的一些细节

UITextField使用的一些细节

这篇博文是我自己使用UITextField的一些总结，并没有太多营养，并会持续更新。

2014.9.15

--------------------------------------------------------------------------------------------------------------------------------------

源码：

//

//  RootViewController.m

//  UITextField

//

//  Created by YouXianMing on 14-9-15.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "RootViewController.h"

@interface RootViewController ()<UITextFieldDelegate>

@property (nonatomic, strong) UITextField *textField;

@end

@implementation RootViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    _textField                      = [[UITextField alloc] initWithFrame:CGRectMake(,  , , )];

    _textField.layer.borderWidth    = .f;

    _textField.layer.borderColor    = [UIColor redColor].CGColor;

    _textField.backgroundColor      = [UIColor whiteColor];

    _textField.textAlignment        = kCTTextAlignmentLeft;    // 左对齐

    _textField.delegate             = self ;

    _textField.keyboardType         = UIKeyboardTypeNumberPad; // 数字键盘

    _textField.placeholder          = @"请输入4位验证码";

    _textField.clearsOnBeginEditing = YES;

    // 空出左侧边缘空隙（通过添加一个view来实现）

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(, , ,

                                                            CGRectGetHeight(_textField.bounds))];

    _textField.leftView     = view;

    _textField.leftViewMode = UITextFieldViewModeAlways;

    [self.view addSubview:_textField];

    // 添加手势

    [self addGesture];

}

- (void)addGesture

{

    // 手势

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];

    [self.view addGestureRecognizer:tap];

}

// 限制输入长度

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

    if (range.location >= )

    {

        return NO;

    }

    else

    {

        return YES;

    }

}

- (void)tapGesture:(UITapGestureRecognizer *)tap

{

    // 取消第一响应状态

    [_textField resignFirstResponder];

}

@end

效果：

左侧空出空隙

限制输入长度

--------------------------------------------------------------------------------------------------------------------------------------