iOS自定义键盘的简单实现

自定义键盘类VolumeInputKeyboardView:

VolumeInputKeyboardView.h文件：

 #import <UIKit/UIKit.h>

 NS_ASSUME_NONNULL_BEGIN

 @interface VolumeInputKeyboardView : UIView
 @property(weak, nonatomic) UITextField *m_textField;
 @end

 NS_ASSUME_NONNULL_END

VolumeInputKeyboardView.m文件：

 switch  ::
 #import <UIKit/UIKit.h>

 NS_ASSUME_NONNULL_BEGIN

 @interface VolumeInputKeyboardView : UIView
 @property(weak, nonatomic) UITextField *m_textField;
 @end

 NS_ASSUME_NONNULL_END

 switch  ::
 #import "VolumeInputKeyboardView.h"
 #import "CommonFunc.h"

 @implementation VolumeInputKeyboardView

 - (instancetype)initWithFrame:(CGRect)frame
 {
     self = [super initWithFrame:frame];
     if (self) {
         [self createTopBar];
         float width = (CGRectGetWidth(self.frame) - ) / ;
         for(int i = ; i < ; ++i)
         {
             [self createKey:[NSString stringWithFormat:@"%d",i] posX:(width * ((i - ) % ) + ((i - ) % )) posY:( +  * ((i - )/)) width:width height:];
         }
         [self createKey:@"" posX: posY:( +  * ) width:(width *  + ) height:];
         [self createKey:@"←" posX:(width *  + ) posY:( +  * ) width:(width) height:];
         [self createKey:@"+" posX:(width + ) *  posY: width:width height:];
         [self createKey:@"-" posX:(width + ) *  posY:( +  * ) width:(width) height:];
     }
     return self;
 }

 - (void)createTopBar
 {
     UIView *topView = [UIView new];
     [topView setBackgroundColor:[UIColor darkGrayColor]];
     [self addSubview:topView];
     topView.frame = CGRectMake(, , CGRectGetWidth(self.frame), );

     UILabel *lbInfo = [[UILabel alloc]initWithFrame:CGRectMake(, , CGRectGetWidth(topView.frame) /  *  - , CGRectGetHeight(topView.frame))];
     [topView addSubview:lbInfo];
     [lbInfo setText:@"一些提示信息"];
     [lbInfo setLineBreakMode:NSLineBreakByWordWrapping];
     [lbInfo setNumberOfLines:];
     [lbInfo setFont:[UIFont systemFontOfSize:]];
     [lbInfo setTextColor:[UIColor whiteColor]];

     UIButton *btnFinish = [[UIButton alloc]initWithFrame:CGRectMake(CGRectGetWidth(topView.frame) /  * , , CGRectGetWidth(topView.frame) /  , CGRectGetHeight(topView.frame))];
     [topView addSubview:btnFinish];
     [btnFinish setTitle:@"完成" forState:UIControlStateNormal];
     [btnFinish setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
     [btnFinish setBackgroundImage:[CommonFunc imageWithColor:[UIColor orangeColor]] forState:UIControlStateHighlighted];
     [btnFinish addTarget:self action:@selector(hideKeyboard) forControlEvents:UIControlEventTouchUpInside];
 }

 - (void)createKey:(NSString *)title posX:(float)posX posY:(float)posY width:(float)width height:(float)height
 {
     UIButton *btnKey = [[UIButton alloc]initWithFrame:CGRectMake(posX, posY, width, height)];
     [self addSubview:btnKey];
     [btnKey addTarget:self action:@selector(buttonDidClicked:) forControlEvents:UIControlEventTouchUpInside];
     [btnKey setTitle:title forState:UIControlStateNormal];
     [btnKey setBackgroundColor:[UIColor lightGrayColor]];
     [btnKey setBackgroundImage:[CommonFunc imageWithColor:[UIColor orangeColor]] forState:UIControlStateHighlighted];
 }

 - (void)buttonDidClicked:(UIButton*)sender
 {
     self.m_textField.text = sender.titleLabel.text;
 }

 -(void)layoutSubviews{
     [super layoutSubviews];

 }

 - (void)hideKeyboard
 {
     //隐藏键盘
     [self.m_textField endEditing:YES];
 }
 @end

调用的地方：

 VolumeInputKeyboardView *volumeKeyboard = [[VolumeInputKeyboardView alloc]initWithFrame:CGRectMake(, , SCREEN_WIDTH, )];

     volumeKeyboard.m_textField = self.m_textField;
     //设置输入框的键盘为自定义的键盘
     self.textField.inputView = volumeKeyboard;

最终实现的键盘效果如下：