通用验证码View控件
1.方便类似于上图的验证码样式的二次开发。（边框，间距文字显示等经过了计算调整）
2.支持代码与xib使用。
3.支持xib中可视化显示效果
/// 验证码位数
@property(nonatomic, assign) IBInspectable NSInteger numberOfVertificationCode;
/// 验证码，可以通过该属性拿到验证码内容
@property (nonatomic, copy ) IBInspectable NSString *vertificationCode;
/// 间距
@property (nonatomic, assign) IBInspectable CGFloat spacing;
/// 边框线宽度
@property (nonatomic, assign) IBInspectable CGFloat lineWidth;
/// 边框颜色
@property (nonatomic, strong) IBInspectable UIColor *borderColor;
/// 边框圆角
@property (nonatomic, assign) IBInspectable CGFloat cornerRadius;
/// font
@property (nonatomic, strong) IBInspectable UIFont *font;
/// textColor
@property (nonatomic, strong) IBInspectable UIColor *textColor;
/// 文本变化回调
@property (nonatomic, copy ) textDidChangeBlock block;
直接拖一个view，修改xib中类名即可，可通过如图设置属性。
- (QTVertificationCodeInputView *)vertificationCodeInputView{
if (!_vertificationCodeInputView) {
_vertificationCodeInputView = [[QTVertificationCodeInputView alloc]initWithFrame:CGRectMake(30, 100, 300, 200)];
_vertificationCodeInputView.numberOfVertificationCode = 4;
_vertificationCodeInputView.lineWidth = 10;
_vertificationCodeInputView.spacing = 10;
_vertificationCodeInputView.cornerRadius = 5;
_vertificationCodeInputView.backgroundColor = [UIColor orangeColor];
}
return _vertificationCodeInputView;
}