@interface ViewController ()

// 左邊按鈕

  @property(nonatomic,strong)UIButton *leftBtn;

// 右邊按鈕

 @property(nonatomic,strong)UIButton *rightBtn;

// 相框屬性和將圖片存入陣列

    @property(nonatomic,strong)UIImageView *myImageView;
    @property(nonatomic,strong)NSArray *imageNames;
    @end


    @implementation
 
 ViewController

    - (void)viewDidLoad {
    [super viewDidLoad];

    self.imageNames = @[@"圖片名",@"圖片名",@"圖片名"];

// 設定相框位置及屬性

self.myImageView = [[UIImageView alloc]initWithFrame:CGRectMake(110, 100, 200, 200)];

// 匯入圖片 其中png格式的只需加上名字 其餘的均要加上字尾

 UIImage *image = [UIImage imageNamed:@"圖片名"];

// 將圖片匯入到相框當中

    self.myImageView.image = image;
    [self.view addSubview:self.myImageView];

//通過右邊按鈕實現圖片交換

 -(void)rightBtnAction

    //    切換到下一張圖片
    //    獲取是第幾張圖片

    {
NSInteger index = [self.imageNames indexOfObject:self.titleLabel.text];
    //    不是最後一張便可以切換

  if (index < 4)
    {
       if (index == 3
 
)
     {
        //            改變右邊按鈕顏色和關閉使用者互動
     self.rightBtn.userInteractionEnabled = NO;
     UIImage *image = [UIImage imageNamed:@"right_disable"];
     [self.rightBtn setBackgroundImage: image forState:(UIControlStateNormal)];
      }
        else
        {
            //   左邊按鈕和顏色都處於正常狀態
        self.leftBtn.userInteractionEnabled = YES;
        self.rightBtn.userInteractionEnabled = YES;
        UIImage *leftNormal = [UIImage imageNamed:@"left_normal"];
        UIImage *rightNormal = [UIImage imageNamed:@"right_normal"];
        [self.leftBtn setBackgroundImage:leftNormal forState:(UIControlStateNormal)];
        [self.rightBtn setBackgroundImage:rightNormal forState:(UIControlStateNormal)];

         }

   //        若不是最後一張那麼切換下一張圖片 通過定義的陣列實現
        NSString *nextTitle = self.imageNames[index+1];
    //        下一張圖片標題即為圖片名稱
        self.titleLabel.text = nextTitle;
    //        下一張圖片即為陣列中的下個元素名字
        self.myImageView.image = [UIImage imageNamed:nextTitle];}

     }

// 通過左邊按鈕實現圖片交換

  -(void)leftBtnAction
    {
            //    切換到上一張圖片
            //    獲取是第幾張圖片
    NSInteger index = [self.imageNames indexOfObject:self.titleLabel.text];
            //    不是第一張便可以切換
     if (index > 0)
 {
       if (index == 1)
        {
     //          左邊互動關閉
         self.leftBtn.userInteractionEnabled = NO;
         UIImage *image = [UIImage imageNamed:@"left_disable"];
         [self.leftBtn setBackgroundImage: image forState:(UIControlStateNormal)];

       else

   {
    //    左右兩邊按鈕都是正常狀態
 self.leftBtn.userInteractionEnabled = YES;
 self.rightBtn.userInteractionEnabled = YES;
 UIImage *leftNormal = [UIImage imageNamed:@"left_normal"];
 UIImage *rightNormal = [UIImage imageNamed:@"right_normal"];
                [self.leftBtn setBackgroundImage:leftNormal forState:(UIControlStateNormal)];
                [self.rightBtn setBackgroundImage:rightNormal forState:(UIControlStateNormal)];

   }

    //        若不是第一張那麼切換為上一張圖片 通過定義的陣列實現
  NSString *lastTitle = self.imageNames[index-1];
    //        上一張圖片標題即為圖片名稱
  self.titleLabel.text = lastTitle;
    //        上一張圖片即為陣列中的下個元素名字
  self.myImageView.image = [UIImage imageNamed:lastTitle];
        }

    }

 //  按鈕監聽

-(void)btnClickLister
  {
        NSLog(@"click btn");
  }

  //防止記憶體溢位
     -(void)didReceiveMemoryWarning
    { 
      [super didEeceiveMemoryWarning];
    }

    @end