自己写的类似UITextView的类，实现UIKeyInput协议

这是别人的一个app作品，我仿着做的，之前对keyboard用的不多，一般都是UITextField用到的，从来没想过可以写个类似功能的

看到这个画面的时候，我在想这是有个隐藏的textField把键盘召唤出来的么，哈哈，也不是没试，写起来挺恶心的，然后才知道可以写个view实现UIKeyInput协议

召唤键盘需要becomeFirstResponser，UIView中canBecomeFirstResponser默认是NO的，所以一定要重写设置下，其他的就和一般View差不多

贴上代码

-(instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];

if(self){

self.backgroundColor = [UIColor clearColor];
textColor = [UIColor blackColor];
font = [UIFont boldSystemFontOfSize:12.0f];
self.textStore = [NSMutableString string];

}

return self;
}
-(void)refresh{
view1.number = 0;
view2.number = 0;
view3.number = 0;

}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
[self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
for(int i = 0; i<3; i++){
CGFloat x = (CGRectGetWidth(self.frame) / 3 - 100) / 2;
numberView *view = [[numberView alloc]initWithFrame:CGRectMake((i * CGRectGetWidth(self.frame) / 3) + x ,0 , 100, 140)];
[self addSubview:view];

if(i == 0){
view1 = view;

}
if(i == 1){
view2 = view;
}
if(i == 2){
view3 = view;

}
}

int number = [self.textStore intValue];

int v1 = number / 100;
int v2 = (number - v1 * 100) / 10;
int v3 = number - v1 * 100 - v2 * 10;
NSLog(@"v1:%d,v2:%d,v3:%d",v1,v2,v3);
view1.number = v1;
view2.number = v2;
view3.number = v3;

}

#pragma mark - UIKeyInput
-(void)insertText:(NSString *)text{
if(self.textStore.length < 3)[self.textStore appendString:text];
else if(self.textStore.length == 3){
[self.textStore appendString:text];
[self.textStore deleteCharactersInRange:NSMakeRange(0, 1)];

}

NSLog(@"%@",self.textStore);

[self.delegate currentNum:[self.textStore intValue]];
[self setNeedsDisplay];
}
-(void)deleteBackward{
if(self.textStore.length == 0)return;

NSRange theRange = NSMakeRange(self.textStore.length - 1, 1);
[self.textStore deleteCharactersInRange:theRange];
[self.delegate currentNum:[self.textStore intValue]];
[self setNeedsDisplay];
}
-(BOOL)hasText{
return self.textStore.length > 0;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
if(![self isFirstResponder])[self becomeFirstResponder];
}

-(BOOL)canBecomeFirstResponder{
return YES;
}
-(UIKeyboardType)keyboardType{
return UIKeyboardTypeNumberPad;
}