A customize selection box by Josh

#import "J_SelectionBox.h"

  J_SelectionBox *exampleBox = [[J_SelectionBox alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];  
  
  [self.view addSubview:exampleBox];

@property (strong, nonatomic) UIButton *upperBtn; // 上按鈕
@property (strong, nonatomic) UILabel *middleLabel; // 中間Label
@property (strong, nonatomic) UIButton *downerBtn; // 下按鈕

@property (nonatomic) int startedNum; // 初始數值
@property (nonatomic) BOOL hideLowerArrowWhenZero; // 當數值為0，下箭頭隱藏
@property (nonatomic) BOOL allowNegativeNumber; // 允許負數
@property (strong, nonatomic) UIColor *upperBtnImgColor; // 設定上方箭頭顏色
@property (strong, nonatomic) UIColor *dowerBtnImgColor; // 設定下方箭頭顏色
@property (strong, nonatomic) UIColor *middleTextColor; // 中間文字顏色
@property (strong, nonatomic) UIColor *middleLabelBackgroundColor; // 中間背景色
@property (strong, nonatomic) UIColor *upperBtnBackgroundColor; // 上按鈕背景色
@property (strong, nonatomic) UIColor *downerBtnBackgroundColor; // 下按鈕背景色

#pragma mark - 介紹導覽列 -

@property (nonatomic, assign) J_IntroduceLabelPosition j_introPositon; // 導覽列位置
@property (nonatomic) BOOL showIntroduceLabel; // 使否顯示介紹導覽列
@property (strong, nonatomic) UILabel *introduceLabel; // 介紹導覽列

@property (nonatomic,weak)id<J_SelectionBoxDelegate>delegate;

@interface ViewController () <J_SelectionBoxDelegate>

#pragma mark - J_SelectionBoxDelegate -

- (void)buttonValueDidChange:(UILabel *)label {
    
    // You can do something while label text changed
    
}