iOS 自定义键盘
很多项目中都使用自定义键盘，实现自定义键盘有很多方法，本文讲的是修改UITextField/UITextView的inputView来实现自定义键盘。
如何修改已经知道了，但是怎么修改。有两种思路：
- 自定义CustomTextField/CustomTextView,直接实现如下代码
textField.inputView = customView;
textView.inputView = customView; 但是这样写有个弊端，就是通用性不强。比如项目中可能要实现某个具体业务逻辑，这个textField/textView是继承ATextField/ATextView，其他地方又有用到的是继承BTextField/BTextView，那我们再写代码时候，可能需要写n个自定义textField/textView，用起来就非常麻烦了，所以这种方法不推荐。
- 使用分类来实现自定义键盘
思路就是在分类中增加一个枚举，这个枚举定义了不同类型的键盘
typedef NS_ENUM(NSUInteger, SJKeyboardType)
{
SJKeyboardTypeDefault, // 使用默认键盘
SJKeyboardTypeNumber // 使用自定义数字键盘
// 还可以根据需求 自定义其他样式...
}; 写一个属性，来标记键盘类型
@property (nonatomic, assign) SJKeyboardType sjKeyboardType;
在.m文件中实现getter和setter方法
static NSString *sjKeyboardTypeKey = @"sjKeyboardTypeKey";
- (SJKeyboardType)sjKeyboardType
{
return [objc_getAssociatedObject(self, &sjKeyboardTypeKey) integerValue];
}
- (void)setSjKeyboardType:(SJKeyboardType)sjKeyboardType
{
objc_setAssociatedObject(self, &sjKeyboardTypeKey, @(sjKeyboardType), OBJC_ASSOCIATION_ASSIGN);
[self setupKeyboard:sjKeyboardType];
}在set方法中来实现自定义键盘视图设置及对应点击方法实现
- (void)setupKeyboard:(SJKeyboardType)sjKeyboardType
{
switch (sjKeyboardType) {
case SJKeyboardTypeDefault:
break;
case SJKeyboardTypeNumber: {
SJCustomKeyboardView *numberInputView = [[[NSBundle mainBundle] loadNibNamed:@"SJCustomKeyboardView" owner:self options:nil] lastObject];
numberInputView.frame = CGRectMake(0, 0, SJSCREEN_WIDTH, SJNumberKeyboardHeight + SJCustomKeyboardBottomMargin);
self.inputView = numberInputView;
numberInputView.textFieldReplacementString = ^(NSString * _Nonnull string) {
BOOL canEditor = YES;
if ([self.delegate respondsToSelector:@selector(textField:shouldChangeCharactersInRange:replacementString:)]) {
canEditor = [self.delegate textField:self shouldChangeCharactersInRange:NSMakeRange(self.text.length, 0) replacementString:string];
}
if (canEditor) {
[self replaceRange:self.selectedTextRange withText:string];
}
};
numberInputView.textFieldShouldDelete = ^{
BOOL canEditor = YES;
if ([self.delegate respondsToSelector:@selector(textField:shouldChangeCharactersInRange:replacementString:)] && self.text.length) {
canEditor = [self.delegate textField:self shouldChangeCharactersInRange:NSMakeRange(self.text.length - 1, 1) replacementString:@""];
}
if (canEditor) {
[self deleteBackward];
}
};
numberInputView.textFieldShouldClear = ^{
BOOL canClear = YES;
if ([self.delegate respondsToSelector:@selector(textFieldShouldClear:)]) {
canClear = [self.delegate textFieldShouldClear:self];
}
if (canClear) {
[self setText:@""];
}
};
numberInputView.textFieldShouldReturn = ^{
if ([self.delegate respondsToSelector:@selector(textFieldShouldReturn:)]) {
[self.delegate textFieldShouldReturn:self];
}
};
break;
}
}
}/* 用代理看的更清楚 但是分类不能实现代理 所以只能用block实现回调 如果自定义textField可以用代理 @protocol SJCustomKeyboardViewDelegate - (void)textFieldReplacementString:(NSString *_Nullable)string; - (BOOL)textFieldShouldDelete; - (BOOL)textFieldShouldClear; - (BOOL)textFieldShouldReturn; @end */
但是分类不能实现代理，所以只能用block来实现回调
@property (nonatomic, copy) void (^textFieldReplacementString)(NSString *string);
@property (nonatomic, copy) void (^textFieldShouldDelete)(void);
@property (nonatomic, copy) void (^textFieldShouldClear)(void);
@property (nonatomic, copy) void (^textFieldShouldReturn)(void);这样好处是只需要引入头文件，修改一个属性即可实现自定义键盘，不会影响项目中其他的业务逻辑。
self.textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, SJSCREEN_WIDTH - 40, 40)];
self.textField.placeholder = @"input";
self.textField.borderStyle = UITextBorderStyleBezel;
self.textField.delegate = self;
[self.view addSubview:self.textField];
self.textField.sjKeyboardType = SJKeyboardTypeNumber;
