ios - 如何在按钮操作上显示图像

Question

我有 10 个 UIImages .当我点击 UIButton它显示在 UIScrollView. But I need to implement the 下用户界面按钮 like **Next**, if用户界面按钮 is clicked first time, it displays the first UIImage`，然后单击它会显示下一个图像。如果单击后退按钮，则应显示上一个图像。

int   currentIndex = 0;
int MAX_COUNT;

NSMutableArray *imageName = [[NSMutableArray alloc] initWithObjects:
                                @"spices.jpg",
                                @"spice_powder.jpg", 
                                @"turmeric.jpg",
                                @"whynani_img3.jpg",
                                @"spice_blends.jpg",
                                @"products1.png", nil];

currentIndex = currentIndex + 1;
if(currentIndex > MAX_COUNT) {
   currentIndex = MAX_COUNT;
}        

for (int i = 0; i<[imageName count]; i++ ) {

   UIImageView  *mmageView = 
     [[UIImageView alloc] initWithFrame:CGRectMake(200,200,350,350)];
   [mmageView setImage:[UIImage imageNamed:[imageName objectAtIndex:i]]];            
   [self.view addSubview:mmageView];           
}

Answer 1

声明全局图片查看 和 int在接口(interface)文件中

UIImageView *imgView;
int index;

在 viewDidLoad:

index = 0;

imgView = [[UIImageView alloc] initWithFrame:CGRectMake(200,200,350,350)];
[imgView setImage:[UIImage imageNamed:[imageName objectAtIndex:index]]];
[self.view addSubView:imgView]; 

在 Next Button Action

-(void)nextButtonAction
{
  ++index;

  [previousBtn setEnabled:YES]; 

  if (index > [imageName count])
  {
    index = [imageName count] - 1;
    [nextBtn setEnabled:NO];
  }

  [imgView setImage:[UIImage imageNamed:[imageName objectAtIndex:index]]];

}

在 Previous Button Action

-(void)previousButtonAction
{
  --index;

  [nextBtn setEnabled:YES]; 

  if (index < 0)
  {
    index = 0;
    [previousBtn setEnabled:NO];
  }

  [imgView setImage:[UIImage imageNamed:[imageName objectAtIndex:index]]];

}