UITextField

SH.png

基础创建

// 创建组件
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 200, 330, 80)];
// 添加视图
[self.view addSubview: textField];
// 外框类型
[textField setBorderStyle:UITextBorderStyleRoundedRect];
// 占位符
textField.placeholder = @"password";
// 光标颜色
textField.tintColor = [UIColor redColor];
// 安全显示
// textField.secureTextEntry = YES;
// 自动纠正
textField.autocorrectionType = UITextAutocorrectionTypeNo;
// 字体大小
textField.font = [UIFont systemFontOfSize:72];
// 编辑时显示删除按钮
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
// 键盘显示类型
textField.keyboardType = UIKeyboardTypeDefault;
// 键盘返回类型
textField.returnKeyType = UIReturnKeyDone;
// 键盘外观
textField.keyboardAppearance = UIKeyboardAppearanceAlert;
// 设置居中输入
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
// 自适应高度(自己设置的高度无效)
textField.autoresizingMask = UIViewAutoresizingFlexibleHeight;
// 左/右视图,唯一有效的就是宽度
textField.leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 100)];
// 显示模式
textField.leftViewMode = UITextFieldViewModeAlways;
// 设置代理
textField.delegate = self;
// 设置弹出视图,不弹出键盘,仅高度有效
// textField.inputView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 100)];
// 当改变字体大小适应宽
textField.adjustsFontSizeToFitWidth = YES;
// 适应宽度时支持的最小字号
textField.minimumFontSize = 5;
// 再次编辑时是否清空
textField.clearsOnBeginEditing = NO;
// 貌似点击回去再次编辑时不清楚，但是只要一输入内容就会清除之前的
textField.clearsOnInsertion = NO;
// 设置return样式,除了默认外,其他的按钮都是蓝颜色背景
textField.returnKeyType = UIReturnKeyGo;

改变占位字符属性

• 方式一: 富文本

NSMutableAttributedString *pswd = [[NSMutableAttributedString alloc] initWithString:@"pswd"];    
[pswd setAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]} range:NSMakeRange(0, 2)];    
[pswd setAttributes:@{NSForegroundColorAttributeName : [UIColor yellowColor], NSFontAttributeName : [UIFont systemFontOfSize:30]} range:NSMakeRange(2, 2)];    
textField.attributedPlaceholder = pswd;

• 方式二: 重绘

 - (void)drawPlaceholderInRect:(CGRect)rect {
    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
    attributes[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
    attributes[NSFontAttributeName] = [UIFont systemFontOfSize:12];
    [[self placeholder] drawInRect:rect withAttributes:attributes];
}

• 方式三: KVC

// 设置占位文字后
textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[self setValue:[UIFont systemFontOfSize:12] forKeyPath:@"_placeholderLabel.font"];

继承UItextField

DDYTextField.h

#import <UIKit/UIKit.h>

@interface DDYTextField : UITextField

@end

DDYTextField.m

#import "DDYTextField.h"

@implementation DDYTextField

#pragma mark 控制清除按钮的位置
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
    return CGRectMake(bounds.origin.x+ bounds.size.width-50, bounds.origin.y+ bounds.size.height-20,16,16);
}

#pragma mark 控制placeHolder的位置，左右缩20
- (CGRect)placeholderRectForBounds:(CGRect)bounds {
    //return CGRectInset(bounds, 10, 0);
    CGRect inset = CGRectMake(bounds.origin.x+10, bounds.origin.y+16, bounds.size.width -10, bounds.size.height);
    return inset;
}
#pragma mark 控制显示文本的位置
- (CGRect)textRectForBounds:(CGRect)bounds {
    //return CGRectInset(bounds, 50, 0);
    CGRect inset = CGRectMake(bounds.origin.x+10, bounds.origin.y, bounds.size.width -10, bounds.size.height);
    return inset;
}
#pragma mark 控制编辑文本的位置
- (CGRect)editingRectForBounds:(CGRect)bounds {
    //return CGRectInset( bounds, 10 , 0 );
    CGRect inset = CGRectMake(bounds.origin.x+10, bounds.origin.y, bounds.size.width -10, bounds.size.height);
    return inset;
}

#pragma mark 控制placeHolder的颜色、字体
- (void)drawPlaceholderInRect:(CGRect)rect {
    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
    attributes[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
    attributes[NSFontAttributeName] = [UIFont systemFontOfSize:12];
    [[self placeholder] drawInRect:rect withAttributes:attributes];
}
#pragma mark 禁止复制，粘贴，全选菜单
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {  
        // 禁用粘贴功能  
        if (action == @selector(paste:))  
            return NO;  
        // 禁用选择功能  
        if (action == @selector(select:))     
            return NO;     
        // 禁用全选功能  
        if (action == @selector(selectAll:))     
            return NO;  
        return [super canPerformAction:action withSender:sender];  
    } 
@end

禁止输入框所有功能按钮

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {  
        UIMenuController *menuController = [UIMenuController sharedMenuController];  
        if (menuController) {  
            [UIMenuController sharedMenuController].menuVisible = NO;  
        }  
    return NO;  
} 

文本框变化监听

1 代理方式

 // <UITextFieldDelegate>

- (void)viewDidLoad {
    textField.delegate = self;    //添加代理
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    // 如果NO就不会显示
    return true;    
}

2 通知方式

- (void) viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:nil];
    //addObserver:self 监听者对象
    //name 监听的改变对象的方法
    //object 监听的对象 nil 全部监听
}
- (void)textChange {
    NSLog(@"%@", textField.text);
}
/** 记得移除 */
- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self]; //移除监听
}

动态添加执行方法

- (void) viewDidLoad {
    [_userName addTarget:self action:@selector(textChange) forControlEvents:UIControlEventEditingChanged];
    //forControlEvents 触发事件
}
- (void)textChange {
    NSLog(@"%@", _userName.text);
}

纯数字问题

当要求输入手机号或者数字密码时，要禁止键盘输入其他字符，甚至防止粘贴方式输入特殊字符
网上很多这种方式

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    return [self isPureInt:string];
}

- (BOOL)isPureInt:(NSString*)string {
    NSScanner* scan = [NSScanner scannerWithString:string];
    int val;
    return[scan scanInt:&val] && [scan isAtEnd];
}

不足显而易见，当返回NO，就没法编辑、删除。
我的一种实现方式

_phoneTextField.keyboardType = UIKeyboardTypeNumberPad;
    [_phoneTextField addTarget:self action:@selector(textFieldTextChange) forControlEvents:UIControlEventEditingChanged];

- (void)textFieldTextChange {
    if (_phoneTextField.text.length>10) {
        _phoneTextField.text = [_phoneTextField.text substringToIndex:11];
    } else if (_phoneTextField.text.length > 0) {
    _phoneTextField.text = [[_phoneTextField.text componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet]] componentsJoinedByString:@""];
    }
}