@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    image1_ = [UIImage imageNamed:@"scene_in.jpg"];

    image2_ = [UIImage imageNamed:@"scene_out.jpg"];

    imageView_ = [[UIImageView alloc]initWithImage:image1_];

    [imageView_.image setAccessibilityIdentifier:@"image1"];

    imageView_.frame = CGRectMake(, , , );

    //[imageView sizeToFit]; 设置视图与图片大小一致

    //设置图片为圆角

    imageView_.layer.masksToBounds = YES;

    imageView_.layer.cornerRadius = 5.0;

    //设置图片的透明度

    imageView_.alpha = 0.1;

    //是否隐藏该图像

    imageView_.hidden = NO;

    //增加点击响应事件

    imageView_.userInteractionEnabled = YES;

    UITapGestureRecognizer *singleTap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(onClickImage)];

    [imageView_ addGestureRecognizer:singleTap];

    [self.view addSubview:imageView_];

}

-(void)onClickImage{

    //切换图片显示

    NSLog(@"%@", imageView_.image.accessibilityIdentifier);

    if([imageView_.image.accessibilityIdentifier isEqualToString:@"image1"]){

        [imageView_ setImage:image2_];

        [imageView_.image setAccessibilityIdentifier:@"image2"];

    }else{

        [imageView_ setImage:image1_];

    }

}

@end