UITextView UITextField

---------------------------------------------------------------------------------UITextView---------------------------------------------------------------------------------------

1:禁止 UITextView 拖动

textView.scrollEnabled = NO;

注:如果动态修改textView的Frame时,不设置为NO,输入光标的显示位置将不会友好.

2: - (void)textViewDidChangeSelection:(UITextView *)textView

修改光标位置代码:

NSRange range;
range.location = 0;
range.length = 0;
textView.selectedRange = range;

注:手动调整光标位置时触发的委托,在第一次启动TextView编辑时,也会触发,会优先于键盘启动观察者事件,可以在这里区别是哪个TextView启动了键盘.

     本委托的优先执行率高于 textViewDidBeginEditing 代理 也高于 UIKeyboardWillShowNotification 通知

3:监听TextView 点击了ReturnKey 按钮

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{

    if ([text isEqualToString:@"\n"]) {

        //这里写按了ReturnKey 按钮后的代码
        return NO;
    }

    return YES;
}

4:为UITextView 添加 Placeholder

#import <UIKit/UIKit.h>

@interface FEUITextView : UITextView

@property(nonatomic) UILabel *placeHolderLabel;
@property(nonatomic) NSString *placeholder;
@property(nonatomic) UIColor *placeholderColor;

@end

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self FE_defaultFunction];
    }
    return self;
}

#pragma mark - Private Function
- (void)FE_defaultFunction
{
    [self setText:@""];
    [self.layer setBorderWidth:1.0f];
    [self.layer setBorderColor:[UIColor colorWithRed:196.0/255.0 green:196.0/255.0 blue:196.0/255.0 alpha:1.0].CGColor];
    [self.layer setCornerRadius:5.0f];
    [self setBackgroundColor:[UIColor whiteColor]];

    [self setPlaceholder:@""];
    [self setPlaceholderColor:[UIColor lightGrayColor]];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(FE_textChanged:) name:UITextViewTextDidChangeNotification object:nil];
}
- (void)FE_textChanged:(NSNotification *)notification
{
    if([[self placeholder] length] == 0)
    {
        return;
    }
    if([[self text] length] == 0)
    {
        [[self viewWithTag:999] setAlpha:1];
    }
    else
    {
        [[self viewWithTag:999] setAlpha:0];
    }
}
- (void)setText:(NSString *)text {
    [super setText:text];
    [self FE_textChanged:nil];
}
- (void)drawRect:(CGRect)rect
{
    if( [[self placeholder] length] > 0 )
    {
        if ( placeHolderLabel == nil )
        {
            placeHolderLabel = [[UILabel alloc] initWithFrame:CGRectMake(8,8,self.bounds.size.width - 16,0)];
            placeHolderLabel.lineBreakMode = UILineBreakModeWordWrap;
            placeHolderLabel.numberOfLines = 0;
            placeHolderLabel.font = self.font;
            placeHolderLabel.backgroundColor = [UIColor clearColor];
            placeHolderLabel.textColor = self.placeholderColor;
            placeHolderLabel.alpha = 0;
            placeHolderLabel.tag = 999;
            [self addSubview:placeHolderLabel];
        }
        placeHolderLabel.text = self.placeholder;
        [placeHolderLabel sizeToFit];
        [self sendSubviewToBack:placeHolderLabel];
    }
    if( [[self text] length] == 0 && [[self placeholder] length] > 0 )
    {
        [[self viewWithTag:999] setAlpha:1];
    }
    [super drawRect:rect];
}

5:键盘启动监听

//视图成功展现出来以后调用
- (void)viewDidAppear:(BOOL)animated
{
    //监听键盘切换
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(FE_keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [self.coopRemarkTextView becomeFirstResponder];
}
//视图准备回收时调用
- (void)viewWillDisappear:(BOOL)animated
{
    [self.coopRemarkTextView resignFirstResponder];
    [UIView animateWithDuration:0.25 delay:0 options:0 animations:^{
        [self.coopRemarkTextView setHelp_height:1];
    } completion:^(BOOL finished) {
    }];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

/**
 *	@brief	当系统键盘被使用是触发此通知
 *
 *	@param 	notification 	通知
 */
- (void)FE_keyboardWillShow:(NSNotification*)notification {
        NSDictionary *userInfo = [notification userInfo];
        NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
        CGRect keyboardRect = [aValue CGRectValue];
        CGRect keyboardFrame = [self.view convertRect:keyboardRect fromView:[[UIApplication sharedApplication] keyWindow]];
        CGFloat  keyboardHieght =keyboardFrame.size.height ;//这里记录键盘启动或者是切换其他类型的键盘时 当前View相对键盘的Y轴
        [UIView animateWithDuration:0.25 delay:0 options:0 animations:^{
            [self.coopRemarkTextView setHelp_height:self.view.Help_height - keyboardHieght-24];
        } completion:^(BOOL finished) {
        }];
}

---------------------------------------------------------------------------------UITextView---------------------------------------------------------------------------------------

---------------------------------------------------------------------------------UITextField---------------------------------------------------------------------------------------

1: 监听 UITextField 值变动事件

[searchTextField addTarget:self action:@selector(FE_fieldValueChange:) forControlEvents:UIControlEventEditingChanged];

2:将输入值显示成保密状态

self.password.secureTextEntry = YES;

3:修改UITextField 输入光标的边距(类似Padding的概念)位置(参考:UITextField设置padding)

- (void)Parent_setTextCursorWithLeftPadding:(CGFloat)paddingLeft withRightPadding:(CGFloat)paddingRight
{
    self.Parent_paddingLeft = paddingLeft;
    self.Parent_paddingRight = paddingRight;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
    return CGRectMake(bounds.origin.x + self.Parent_paddingLeft,
                      bounds.origin.y ,
                      bounds.size.width - self.Parent_paddingRight, bounds.size.height);
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
    return [self textRectForBounds:bounds];
}

4:去掉键盘输入时的辅助提示

self.testTextField.autocorrectionType = UITextAutocorrectionTypeNo;

5:设置UITextField在空值时禁止Return Key的使用

self.testTextField.enablesReturnKeyAutomatically = YES;

6:设置键盘风格

self.testTextField.keyboardAppearance = UIKeyboardAppearanceAlert;//黑色风格 目前只有两种

7:为UITextField加入清除输入值按钮

[_flowCalendarTimeInputView setClearButtonMode:UITextFieldViewModeWhileEditing];

8:修复UITextField 当前光标所在位置 (参考:光标移动)

- (void)Help_moveCursorWithDirection:(UITextLayoutDirection)direction offset:(NSInteger)offset
{
	UITextRange *range = self.selectedTextRange;
	UITextPosition* start = [self positionFromPosition:range.start inDirection:direction offset:offset];
	if (start)
	{
		[self setSelectedTextRange:[self textRangeFromPosition:start toPosition:start]];
	}
}

注:1:所入光标移动的方向 和  位置值

     2:如果需要在键盘刚启动时就修改键盘光标位置请在  becomeFirstResponder前调用

[_flowCalendarTimeInputView becomeFirstResponder];
[_flowCalendarTimeInputView Help_moveCursorWithDirection:UITextLayoutDirectionLeft offset:1];

9:基于第八点技术实现手工输入时间数字校验代码:

第一步: 先设置委托和监听

[_flowCalendarTimeInputView setDelegate:self];
[_flowCalendarTimeInputView addTarget:self action:@selector(Flow_inputTimeValueChange:) forControlEvents:UIControlEventEditingChanged];

第二步:实现

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if ([string isEqualToString:@""]) {
        return NO;
    }
    switch (textField.text.length) {
        case 1:
            if ([string  intValue] > 2) {
                return NO;
            }
            break;
        case 2:
            if ([string  intValue] > 3) {
                return NO;
            }
            break;
        case 3:
            if ([string  intValue] > 5) {
                return NO;
            }
            break;
        case 4:

            break;
        default:
            break;
    }
    return YES;
}
- (void)Flow_inputTimeValueChange:(UITextField *)textField
{
    if (textField.text.length == 0) {
        [textField setText:@":"];
        [textField Help_moveCursorWithDirection:UITextLayoutDirectionLeft offset:1];
    }
    if (textField.text.length == 5) {
        [self setFlowCalendarSelectedDate:[NSDate Help_dateWithDateString:[NSString stringWithFormat:@"2012-11-01 %@:00",textField.text]] modifyMode:FlowCalendarSelectedDateModifyModeTime];
    }
    if (textField.text.length >= 6) {
        textField.text = [textField.text substringWithRange:(NSRange){0,textField.text.length-1}];
    }
    if (textField.text.length == 3) {
        [textField Help_moveCursorWithDirection:UITextLayoutDirectionRight offset:1];
    }
}

10:为 键盘类型: UIKeyboardTypeNumberPad 添加 完成按钮(参考:http://www.winddisk.com/2012/04/06/uikeyboardtypenumberpad_add_returnkey/)

 一:注册监听事件:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(Flow_keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];

/**
 *	@brief	当系统键盘展现出来以后触发此通知
 *
 *	@param 	notification 	通知
 */
- (void)Flow_keyboardDidShow:(NSNotification*)notification {
    [self Flow_addFinishButtonToKeyboard];
}

那么当键盘展现出来时,就会触发这个方法:

二:添加完成按钮方法:

- (void)Flow_addFinishButtonToKeyboard {
	// create custom button
	UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
	doneButton.frame = CGRectMake(0, 163, 106, 53);
	doneButton.adjustsImageWhenHighlighted = NO;
    [doneButton setImage:[UIImage imageNamed:@"DoneUp3.png"] forState:UIControlStateNormal];
    [doneButton setImage:[UIImage imageNamed:@"DoneDown3.png"] forState:UIControlStateHighlighted];
	[doneButton addTarget:self action:@selector(Flow_finishSelectedAction:) forControlEvents:UIControlEventTouchUpInside];
	// locate keyboard view
	UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
	UIView* keyboard;
	for(int i=0; i<[tempWindow.subviews count]; i++) {
		keyboard = [tempWindow.subviews objectAtIndex:i];
		if([[keyboard description] hasPrefix:@"<UIPeripheralHost"] == YES)
            [keyboard addSubview:doneButton];
	}
}

找到keywindow后再依次找到键盘视图的原理

三:不使用的时候必须撤销这个键盘监听事件,否则影响其他视图键盘的使用

[[NSNotificationCenter defaultCenter] removeObserver:self];

11:设置UITextField 水平居中,垂直居中

[_flowCalendarTimeInputView setTextAlignment:NSTextAlignmentCenter];
[_flowCalendarTimeInputView setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];

---------------------------------------------------------------------------------UITextField---------------------------------------------------------------------------------------

时间： 2024-11-05 12:19:33

UITextView UITextField的相关文章

iOS UITextField最大字符数和字节数的限制详解_IOS

前言 这里我给大家几组测试用例可以一试,为啥不好用.      1.限制10个字节,输入2个Emoj之后是8个字节(一个Emoj是4个字节),此时再输入一个中文,看看结果如何(中文的UTF8占3个字节)      2.限制5个字符,一个Emoj是2个字符,其他都是一个.此时输入两个Emoj,再输入中文,然后中文联想试试. 就目前的情况来说,看了很多资料,并没有一个通用的能限制字符数和字节数的封装.这里全面进行了总结,并进行了封装.欢迎大家下载. 一. 字符限制 1. 错误方法 常见的这种方法是错

如何禁用/解除禁用 复制、剪切、选择、全选

需求 希望能够屏蔽文本框的复制.粘贴等动能,或者在某些界面需要解除屏蔽功能. 解决方案 我们需要重写canPerformAction:withSender:方法实现 代码1:禁用所有长按文本框操作 #pragma mark - 禁用所有长按文本框操作 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender { if ([UIMenuController sharedMenuController]) { [UIMenuControlle

深入解析设计模式中的装饰器模式在iOS应用开发中的实现_IOS

装饰器模式可以在不修改代码的情况下灵活的为一对象添加行为和职责.当你要修改一个被其它类包含的类的行为时,它可以代替子类化方法. 一.基本实现下面我把类的结构图向大家展示如下: 让我们简单分析一下上面的结构图,Component是定义一个对象接口,可以给这些对象动态地添加职责.ConcreteComponent是定义了一个具体的对象,也可以给这个对象添加一些职责.Decorator,装饰抽象类,继承了Component,从外类来扩展Component类的功能,但对于Component来说,是无需知

用UITextView模拟UITextField的placeHolder

用UITextView模拟UITextField的placeHolder 效果: 源码: // // ViewController.m // TextView // // Created by YouXianMing on 14/12/18. // Copyright (c) 2014年 YouXianMing. All rights reserved. // #import "ViewController.h" static NSString *placeHolderStr = @&

UIKit 框架之UITextView

// // ViewController.m // UItextView // // Created by City--Online on 15/5/22. // Copyright (c) 2015年 XQB. All rights reserved. // #import "ViewController.h" @interface ViewController ()<UITextViewDelegate> @property(nonatomic,strong) UITe

iOS中 UITextView文本视图 技术分享

 UITextView:  文本视图相比与UITextField直观的区别就是UITextView可以输入多行文字并且可以滚动显示浏览全文.  UITextField的用处多,UITextView的用法也不少.常见UITextView使用在APP的软件简介.内容详情显示  小说阅读显示.发表空间内容输入.说说文本框.评论文本框等.UITextView的使用有它本身的代理方法,也有  继承于父类的方法.本身的方法有从开始编辑到结束编辑的整个过程的监听,继承的方法主要是继承于  UIScrollVi

objective c-设置UItextfield边框颜色

问题描述 设置UItextfield边框颜色 iphone中,在编辑文本时怎么设置UITextView的边框颜色? 下面的代码没有实现. - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { textField.layer.borderColor=[[UIColor cyanColor] CGColor]; } 解决方案 加上:#Import <QuartzCore/QuartzCore.h> 用下面的代码就行: - (B

ios基础控件之UITextView

多行文本控件UITextView继承UIScrollView:UIView控件,默认是带有滚动条的.UITextView和UITextField都是文本编辑.显示控件,它们功能和行为在很多方面都是相似的. UITextView与UITextField的区别主要在以下三点: UITextView是一个多行文本框,而UITextField只是单行文本框. UITextView没有继承UIControl控件,因此不能绑定IBAction事件处理 方法:也不能调用UIControl提供的addTarge

UIKit 框架之UITextField

// // ViewController.m // UITextField // // Created by City--Online on 15/5/20. // Copyright (c) 2015年 XQB. All rights reserved. // #import "ViewController.h" @interface ViewController ()<UITextFieldDelegate> @property(nonatomic,strong) UI